From 7aa03abef005834908d03800ec82f2915a4f0972 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Mon, 20 May 2024 18:40:57 +0200
Subject: [PATCH 01/25] Add custom mutator command

---
 src/Command/CustomMutatorCommand.php         | 125 +++++++++++++++++++
 src/CustomMutator/templates/__Name__.php     |  50 ++++++++
 src/CustomMutator/templates/__Name__Test.php |  80 ++++++++++++
 3 files changed, 255 insertions(+)
 create mode 100644 src/Command/CustomMutatorCommand.php
 create mode 100644 src/CustomMutator/templates/__Name__.php
 create mode 100644 src/CustomMutator/templates/__Name__Test.php

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
new file mode 100644
index 0000000000..4be8364698
--- /dev/null
+++ b/src/Command/CustomMutatorCommand.php
@@ -0,0 +1,125 @@
+<?php
+/**
+ * This code is licensed under the BSD 3-Clause License.
+ *
+ * Copyright (c) 2017, Maks Rafalko
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * * Neither the name of the copyright holder nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+declare(strict_types=1);
+
+namespace Infection\Command;
+
+use Symfony\Component\Filesystem\Filesystem;
+use Symfony\Component\Finder\Finder;
+use function array_key_exists;
+use function array_keys;
+use Infection\Console\IO;
+use Infection\Mutator\Definition;
+use Infection\Mutator\Mutator;
+use Infection\Mutator\MutatorResolver;
+use Infection\Mutator\ProfileList;
+use function getcwd;
+use function iterator_to_array;
+use function sprintf;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Question\Question;
+use Webmozart\Assert\Assert;
+use function str_replace;
+
+/**
+ * @internal
+ */
+final class CustomMutatorCommand extends BaseCommand
+{
+    protected function configure(): void
+    {
+        $this
+            ->setName('custom-mutator')
+            ->setDescription('Creates a cusotm mutator')
+            ->addArgument('Mutator name', InputArgument::OPTIONAL);
+    }
+
+    protected function executeCommand(IO $io): bool
+    {
+        $mutator = $io->getInput()->getArgument('Mutator name');
+
+        if ($mutator === null) {
+            $question = new Question('What mutator do you wish to create (e.g. `AnyStringToInfectedMutator`)?');
+            $question->setValidator(function (string|null $answer): string {
+                if ($answer === null || trim($answer) === '') {
+                    throw new \RuntimeException('Mutator name is mandaory.');
+                }
+
+                return $answer;
+            });
+            $mutator = $io->askQuestion(
+                $question,
+            );
+        }
+
+        $mutator = ucfirst((string) $mutator);
+
+        // find all files in templates directory
+        $finder = Finder::create()
+            ->files()
+            ->in(__DIR__ . '/../CustomMutator/templates');
+
+        $currentDirectory = getcwd();
+
+        $generatedFilePaths = [];
+
+        $fileInfos = iterator_to_array($finder->getIterator());
+        $fileSystem = $this->getApplication()->getContainer()->getFileSystem();
+
+        foreach ($fileInfos as $fileInfo) {
+            // replace __Name__ with $mutator
+            $newContent = $this->replaceNameVariable($mutator, $fileInfo->getContents());
+            $replacedNamePath = $this->replaceNameVariable($mutator, $fileInfo->getRelativePathname());
+
+            $newFilePath = $currentDirectory . '/src/Mutator/' . $replacedNamePath;
+
+            $fileSystem->dumpFile($newFilePath, $newContent);
+
+            $generatedFilePaths[] = $newFilePath;
+        }
+
+        $io->title('Generated files');
+        $io->listing($generatedFilePaths);
+        $io->success(
+            sprintf('Base classes for the "%s" mutator were created. Complee the missing parts inside them.', $mutator)
+        );
+
+        return true;
+    }
+
+    private function replaceNameVariable(string $rectorName, string $contents): string
+    {
+        return str_replace('__Name__', $rectorName, $contents);
+    }
+}
diff --git a/src/CustomMutator/templates/__Name__.php b/src/CustomMutator/templates/__Name__.php
new file mode 100644
index 0000000000..412ca2baf8
--- /dev/null
+++ b/src/CustomMutator/templates/__Name__.php
@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Mutator;
+
+use Infection\Mutator\Definition;
+use Infection\Mutator\Mutator;
+use PhpParser\Node;
+
+class __Name__ implements Mutator
+{
+    public function canMutate(Node $node): bool
+    {
+        // TODO: update the logic to decide if this mutator can mutate $node
+        return false;
+    }
+
+    /**
+     * @psalm-mutation-free
+     *
+     * @return iterable<TODO>
+     */
+    public function mutate(Node $node): iterable
+    {
+        // TODO: update the logic to return mutated nodes
+        yield $node;
+    }
+
+    public static function getDefinition(): Definition
+    {
+        return new Definition(
+            <<<'TXT'
+                TODO: add description of this mutator here
+                TXT
+            ,
+            MutatorCategory::ORTHOGONAL_REPLACEMENT,
+            null,
+            <<<'DIFF'
+                - TODO: show the source code before mutation
+                + TODO: show the source code after mutation
+                DIFF,
+        );
+    }
+
+    public function getName(): string
+    {
+        return self::class;
+    }
+}
diff --git a/src/CustomMutator/templates/__Name__Test.php b/src/CustomMutator/templates/__Name__Test.php
new file mode 100644
index 0000000000..abad38c707
--- /dev/null
+++ b/src/CustomMutator/templates/__Name__Test.php
@@ -0,0 +1,80 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Mutator;
+
+use Infection\Testing\BaseMutatorTestCase;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
+use App\Mutator\__Name__;
+
+#[CoversClass(__Name__::class)]
+final class __Name__Test extends BaseMutatorTestCase
+{
+    protected function getTestedMutatorClassName(): string
+    {
+        return __Name__::class;
+    }
+
+    /**
+     * @param string|string[] $expected
+     */
+    #[DataProvider('mutationsProvider')]
+    public function test_it_can_mutate(string $input, $expected = []): void
+    {
+        $this->doTest($input, $expected);
+    }
+
+    public static function mutationsProvider(): iterable
+    {
+        // TODO: write original and mutated code in each cases
+        // TODO: if you want to test that the code is not mutated, just leave one element (source code) in the array
+        // TODO: if mutator produces N mutants, the second array item must be an array of mutated codes
+
+        yield 'It mutates a simple case' => [
+            <<<'PHP'
+                <?php
+
+                $a = 10 + 3;
+                PHP
+            ,
+            <<<'PHP'
+                <?php
+
+                $a = 10 - 3;
+                PHP
+            ,
+        ];
+
+//        yield 'It does not mutate other cases' => [
+//            <<<'PHP'
+//                <?php
+//
+//                $a = 10 * 3;
+//                PHP
+//            ,
+//        ];
+
+//        yield 'It produces N mutations' => [
+//            <<<'PHP'
+//                <?php
+//
+//                $a = 10 - 3;
+//                PHP
+//            ,
+//            [
+//                <<<'PHP'
+//                <?php
+//
+//                $a = 10 - 3;
+//                PHP,
+//                <<<'PHP'
+//                <?php
+//
+//                $a = 10 - -3;
+//                PHP
+//            ]
+//        ];
+    }
+}

From 9dbdaf1fadc3acfe0ed01ee6b6b0cce2878741ba Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Mon, 20 May 2024 18:41:17 +0200
Subject: [PATCH 02/25] Move `BaseMutatorTestCase` to Infection\Testing
 namespace

---
 composer.lock                                 |  2 +-
 infection.json5                               |  2 +-
 src/Console/Application.php                   |  2 ++
 .../Testing}/BaseMutatorTestCase.php          | 36 +++++++++++--------
 .../Mutator => src/Testing}/MutatorName.php   |  4 +--
 .../Testing}/SimpleMutation.php               |  2 +-
 .../SimpleMutationsCollectorVisitor.php       |  2 +-
 .../Testing}/SingletonContainer.php           |  2 +-
 .../Testing}/SourceTestClassNameScheme.php    |  2 +-
 .../Testing}/StringNormalizer.php             |  4 +--
 tests/phpunit/AutoReview/ContainerTest.php    |  8 ++---
 .../EnvTestCasesProvider.php                  | 12 +++----
 .../IntegrationGroupProvider.php              | 14 ++++----
 .../ProjectCode/ProjectCodeTest.php           | 16 ++++-----
 .../SourceTestClassNameSchemeTest.php         |  1 +
 tests/phpunit/Command/DescribeCommandTest.php |  2 +-
 tests/phpunit/Command/RunCommandTest.php      |  2 +-
 .../ConfigurationFactoryTest.php              |  4 +--
 tests/phpunit/Console/E2ETest.php             | 36 +++++++++----------
 tests/phpunit/ContainerTest.php               |  1 +
 .../Logger/CreateMetricsCalculator.php        |  2 +-
 .../Html/StrykerHtmlReportBuilderTest.php     | 12 +++----
 .../Metrics/CreateMutantExecutionResult.php   |  4 +--
 .../SortableMutantExecutionResultsTest.php    |  4 +--
 .../phpunit/Mutant/MutantCodeFactoryTest.php  |  4 +--
 .../MutantExecutionResultFactoryTest.php      |  2 +-
 .../Mutant/MutantExecutionResultTest.php      |  4 +--
 tests/phpunit/Mutant/MutantFactoryTest.php    |  2 +-
 tests/phpunit/Mutant/MutantTest.php           |  4 +--
 .../Mutation/FileMutationGeneratorTest.php    | 10 +++---
 tests/phpunit/Mutation/MutationTest.php       |  6 ++--
 .../Arithmetic/AssignmentEqualTest.php        |  2 +-
 .../Mutator/Arithmetic/AssignmentTest.php     |  2 +-
 .../Mutator/Arithmetic/BitwiseAndTest.php     |  2 +-
 .../Mutator/Arithmetic/BitwiseNotTest.php     |  2 +-
 .../Mutator/Arithmetic/BitwiseOrTest.php      |  2 +-
 .../Mutator/Arithmetic/BitwiseXorTest.php     |  2 +-
 .../Mutator/Arithmetic/DecrementTest.php      |  2 +-
 .../Mutator/Arithmetic/DivEqualTest.php       |  2 +-
 .../Mutator/Arithmetic/DivisionTest.php       |  2 +-
 .../Mutator/Arithmetic/ExponentiationTest.php |  2 +-
 .../Mutator/Arithmetic/IncrementTest.php      |  2 +-
 .../Mutator/Arithmetic/MinusEqualTest.php     |  2 +-
 .../phpunit/Mutator/Arithmetic/MinusTest.php  |  2 +-
 .../Mutator/Arithmetic/ModEqualTest.php       |  2 +-
 .../Mutator/Arithmetic/ModulusTest.php        |  2 +-
 .../Mutator/Arithmetic/MulEqualTest.php       |  2 +-
 .../Mutator/Arithmetic/MultiplicationTest.php |  2 +-
 .../Mutator/Arithmetic/PlusEqualTest.php      |  2 +-
 tests/phpunit/Mutator/Arithmetic/PlusTest.php |  2 +-
 .../Mutator/Arithmetic/PowEqualTest.php       |  2 +-
 .../Mutator/Arithmetic/RoundingFamilyTest.php |  2 +-
 .../Mutator/Arithmetic/ShiftLeftTest.php      |  2 +-
 .../Mutator/Arithmetic/ShiftRightTest.php     |  2 +-
 .../phpunit/Mutator/Boolean/ArrayItemTest.php |  2 +-
 .../Mutator/Boolean/EqualIdenticalTest.php    |  2 +-
 .../Mutator/Boolean/FalseValueTest.php        |  2 +-
 .../Mutator/Boolean/IdenticalEqualTest.php    |  2 +-
 .../Mutator/Boolean/InstanceOf_Test.php       |  2 +-
 .../LogicalAndAllSubExprNegationTest.php      |  2 +-
 .../Boolean/LogicalAndNegationTest.php        |  2 +-
 .../LogicalAndSingleSubExprNegationTest.php   |  2 +-
 .../Mutator/Boolean/LogicalAndTest.php        |  2 +-
 .../Mutator/Boolean/LogicalLowerAndTest.php   |  2 +-
 .../Mutator/Boolean/LogicalLowerOrTest.php    |  2 +-
 .../Mutator/Boolean/LogicalNotTest.php        |  2 +-
 .../LogicalOrAllSubExprNegationTest.php       |  2 +-
 .../Mutator/Boolean/LogicalOrNegationTest.php |  2 +-
 .../LogicalOrSingleSubExprNegationTest.php    |  2 +-
 .../phpunit/Mutator/Boolean/LogicalOrTest.php |  2 +-
 .../Boolean/NotEqualNotIdenticalTest.php      |  2 +-
 .../Boolean/NotIdenticalNotEqualTest.php      |  2 +-
 .../phpunit/Mutator/Boolean/TrueValueTest.php |  2 +-
 tests/phpunit/Mutator/Boolean/Yield_Test.php  |  2 +-
 tests/phpunit/Mutator/Cast/CastArrayTest.php  |  2 +-
 tests/phpunit/Mutator/Cast/CastBoolTest.php   |  2 +-
 tests/phpunit/Mutator/Cast/CastFloatTest.php  |  2 +-
 tests/phpunit/Mutator/Cast/CastIntTest.php    |  2 +-
 tests/phpunit/Mutator/Cast/CastObjectTest.php |  2 +-
 tests/phpunit/Mutator/Cast/CastStringTest.php |  2 +-
 .../GreaterThanOrEqualToTest.php              |  2 +-
 .../ConditionalBoundary/GreaterThanTest.php   |  2 +-
 .../LessThanOrEqualToTest.php                 |  2 +-
 .../ConditionalBoundary/LessThanTest.php      |  2 +-
 .../ConditionalNegotiation/EqualTest.php      |  2 +-
 .../GreaterThanNegotiationTest.php            |  2 +-
 .../GreaterThanOrEqualToNegotiationTest.php   |  2 +-
 .../ConditionalNegotiation/IdenticalTest.php  |  2 +-
 .../LessThanNegotiationTest.php               |  2 +-
 .../LessThanOrEqualToNegotiationTest.php      |  2 +-
 .../ConditionalNegotiation/NotEqualTest.php   |  2 +-
 .../NotIdenticalTest.php                      |  2 +-
 tests/phpunit/Mutator/DefinitionTest.php      |  8 ++---
 .../phpunit/Mutator/Extensions/BCMathTest.php |  6 ++--
 .../Mutator/Extensions/MBStringTest.php       |  4 +--
 .../ProtectedVisibilityTest.php               |  2 +-
 .../PublicVisibilityTest.php                  |  2 +-
 tests/phpunit/Mutator/IgnoreMutatorTest.php   |  3 +-
 tests/phpunit/Mutator/InvalidMutatorTest.php  |  1 +
 tests/phpunit/Mutator/Loop/DoWhileTest.php    |  2 +-
 tests/phpunit/Mutator/Loop/For_Test.php       |  2 +-
 tests/phpunit/Mutator/Loop/Foreach_Test.php   |  2 +-
 tests/phpunit/Mutator/Loop/While_Test.php     |  2 +-
 tests/phpunit/Mutator/MutatorFactoryTest.php  | 11 +++---
 .../Mutator/MutatorFixturesProvider.php       |  7 ++--
 tests/phpunit/Mutator/MutatorResolverTest.php |  9 ++---
 .../phpunit/Mutator/MutatorRobustnessTest.php | 11 +++---
 tests/phpunit/Mutator/NoopMutatorTest.php     |  3 +-
 .../Mutator/Number/DecrementIntegerTest.php   |  6 ++--
 .../Mutator/Number/IncrementIntegerTest.php   |  6 ++--
 .../Mutator/Number/OneZeroFloatTest.php       |  2 +-
 .../Mutator/Operator/AssignCoalesceTest.php   |  2 +-
 tests/phpunit/Mutator/Operator/Break_Test.php |  2 +-
 tests/phpunit/Mutator/Operator/Catch_Test.php |  2 +-
 .../phpunit/Mutator/Operator/CoalesceTest.php |  2 +-
 tests/phpunit/Mutator/Operator/ConcatTest.php |  2 +-
 .../Mutator/Operator/Continue_Test.php        |  2 +-
 .../Mutator/Operator/ElseIfNegationTest.php   |  2 +-
 .../phpunit/Mutator/Operator/Finally_Test.php |  2 +-
 .../Mutator/Operator/IfNegationTest.php       |  2 +-
 .../Operator/NullSafeMethodCallTest.php       |  4 +--
 .../Operator/NullSafePropertyCallTest.php     |  4 +--
 .../Mutator/Operator/SpreadAssignmentTest.php |  2 +-
 .../Mutator/Operator/SpreadOneItemTest.php    |  2 +-
 .../Mutator/Operator/SpreadRemovalTest.php    |  2 +-
 .../phpunit/Mutator/Operator/TernaryTest.php  |  4 +--
 tests/phpunit/Mutator/Operator/Throw_Test.php |  2 +-
 tests/phpunit/Mutator/ProfileListTest.php     |  7 ++--
 .../Mutator/Regex/PregMatchMatchesTest.php    |  2 +-
 .../Regex/PregMatchRemoveCaretTest.php        |  2 +-
 .../Regex/PregMatchRemoveDollarTest.php       |  2 +-
 .../Regex/PregMatchRemoveFlagsTest.php        |  2 +-
 tests/phpunit/Mutator/Regex/PregQuoteTest.php |  2 +-
 .../Mutator/Removal/ArrayItemRemovalTest.php  |  2 +-
 .../Mutator/Removal/CatchBlockRemovalTest.php |  2 +-
 .../Mutator/Removal/CloneRemovalTest.php      |  2 +-
 .../Removal/ConcatOperandRemovalTest.php      |  2 +-
 .../Removal/FunctionCallRemovalTest.php       |  2 +-
 .../Mutator/Removal/MatchArmRemovalTest.php   |  2 +-
 .../Mutator/Removal/MethodCallRemovalTest.php |  2 +-
 .../Mutator/Removal/SharedCaseRemovalTest.php |  2 +-
 .../Mutator/ReturnValue/ArrayOneItemTest.php  |  2 +-
 .../Mutator/ReturnValue/FloatNegationTest.php |  2 +-
 .../Mutator/ReturnValue/FunctionCallTest.php  |  2 +-
 .../ReturnValue/IntegerNegationTest.php       |  2 +-
 .../Mutator/ReturnValue/NewObjectTest.php     |  2 +-
 .../phpunit/Mutator/ReturnValue/ThisTest.php  |  4 +--
 .../Mutator/ReturnValue/YieldValueTest.php    |  2 +-
 tests/phpunit/Mutator/Sort/SpaceshipTest.php  |  2 +-
 tests/phpunit/Mutator/SyntaxErrorTest.php     |  1 +
 .../Unwrap/UnwrapArrayChangeKeyCaseTest.php   |  2 +-
 .../Mutator/Unwrap/UnwrapArrayChunkTest.php   |  2 +-
 .../Mutator/Unwrap/UnwrapArrayColumnTest.php  |  2 +-
 .../Mutator/Unwrap/UnwrapArrayCombineTest.php |  2 +-
 .../Unwrap/UnwrapArrayDiffAssocTest.php       |  2 +-
 .../Mutator/Unwrap/UnwrapArrayDiffKeyTest.php |  2 +-
 .../Mutator/Unwrap/UnwrapArrayDiffTest.php    |  2 +-
 .../Unwrap/UnwrapArrayDiffUassocTest.php      |  2 +-
 .../Unwrap/UnwrapArrayDiffUkeyTest.php        |  2 +-
 .../Mutator/Unwrap/UnwrapArrayFilterTest.php  |  2 +-
 .../Mutator/Unwrap/UnwrapArrayFlipTest.php    |  2 +-
 .../Unwrap/UnwrapArrayIntersectAssocTest.php  |  2 +-
 .../Unwrap/UnwrapArrayIntersectKeyTest.php    |  2 +-
 .../Unwrap/UnwrapArrayIntersectTest.php       |  2 +-
 .../Unwrap/UnwrapArrayIntersectUassocTest.php |  2 +-
 .../Unwrap/UnwrapArrayIntersectUkeyTest.php   |  2 +-
 .../Mutator/Unwrap/UnwrapArrayKeysTest.php    |  2 +-
 .../Mutator/Unwrap/UnwrapArrayMapTest.php     |  2 +-
 .../Unwrap/UnwrapArrayMergeRecursiveTest.php  |  2 +-
 .../Mutator/Unwrap/UnwrapArrayMergeTest.php   |  2 +-
 .../Mutator/Unwrap/UnwrapArrayPadTest.php     |  2 +-
 .../Mutator/Unwrap/UnwrapArrayReduceTest.php  |  2 +-
 .../UnwrapArrayReplaceRecursiveTest.php       |  2 +-
 .../Mutator/Unwrap/UnwrapArrayReplaceTest.php |  2 +-
 .../Mutator/Unwrap/UnwrapArrayReverseTest.php |  2 +-
 .../Mutator/Unwrap/UnwrapArraySliceTest.php   |  2 +-
 .../Mutator/Unwrap/UnwrapArraySpliceTest.php  |  2 +-
 .../Unwrap/UnwrapArrayUdiffAssocTest.php      |  2 +-
 .../Mutator/Unwrap/UnwrapArrayUdiffTest.php   |  2 +-
 .../Unwrap/UnwrapArrayUdiffUassocTest.php     |  2 +-
 .../Unwrap/UnwrapArrayUintersectAssocTest.php |  2 +-
 .../Unwrap/UnwrapArrayUintersectTest.php      |  2 +-
 .../UnwrapArrayUintersectUassocTest.php       |  2 +-
 .../Mutator/Unwrap/UnwrapArrayUniqueTest.php  |  2 +-
 .../Mutator/Unwrap/UnwrapArrayValuesTest.php  |  2 +-
 .../Mutator/Unwrap/UnwrapFinallyTest.php      |  2 +-
 .../Mutator/Unwrap/UnwrapLcFirstTest.php      |  2 +-
 .../Mutator/Unwrap/UnwrapLtrimTest.php        |  2 +-
 .../Mutator/Unwrap/UnwrapRtrimTest.php        |  2 +-
 .../Mutator/Unwrap/UnwrapStrIreplaceTest.php  |  2 +-
 .../Mutator/Unwrap/UnwrapStrRepeatTest.php    |  2 +-
 .../Mutator/Unwrap/UnwrapStrReplaceTest.php   |  2 +-
 .../Mutator/Unwrap/UnwrapStrRevTest.php       |  2 +-
 .../Mutator/Unwrap/UnwrapStrShuffleTest.php   |  2 +-
 .../Mutator/Unwrap/UnwrapStrToLowerTest.php   |  2 +-
 .../Mutator/Unwrap/UnwrapStrToUpperTest.php   |  2 +-
 .../Mutator/Unwrap/UnwrapSubstrTest.php       |  2 +-
 .../phpunit/Mutator/Unwrap/UnwrapTrimTest.php |  2 +-
 .../Mutator/Unwrap/UnwrapUcFirstTest.php      |  2 +-
 .../Mutator/Unwrap/UnwrapUcWordsTest.php      |  2 +-
 tests/phpunit/MutatorNameTest.php             |  2 +-
 tests/phpunit/PhpParser/FileParserTest.php    |  6 ++--
 .../PhpParser/Visitor/BaseVisitorTestCase.php |  2 +-
 .../PhpParser/Visitor/CloneVisitorTest.php    |  2 +-
 .../IgnoreNode/BaseNodeIgnorerTestCase.php    |  2 +-
 .../PhpParser/Visitor/MutatorVisitorTest.php  |  6 ++--
 .../Factory/MutantProcessFactoryTest.php      |  6 ++--
 .../Runner/MutationTestingRunnerTest.php      | 10 +++---
 tests/phpunit/StringNormalizerTest.php        |  1 +
 .../Coverage/LineRangeCalculatorTest.php      |  2 +-
 210 files changed, 334 insertions(+), 314 deletions(-)
 rename {tests/phpunit/Mutator => src/Testing}/BaseMutatorTestCase.php (90%)
 rename {tests/phpunit/Mutator => src/Testing}/MutatorName.php (98%)
 rename {tests/phpunit/Fixtures => src/Testing}/SimpleMutation.php (96%)
 rename {tests/phpunit/Fixtures => src/Testing}/SimpleMutationsCollectorVisitor.php (97%)
 rename {tests/phpunit => src/Testing}/SingletonContainer.php (98%)
 rename {tests/phpunit/AutoReview => src/Testing}/SourceTestClassNameScheme.php (98%)
 rename {tests/phpunit => src/Testing}/StringNormalizer.php (98%)

diff --git a/composer.lock b/composer.lock
index 05b770bb73..c03561add3 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4806,5 +4806,5 @@
     "platform-overrides": {
         "php": "8.1.0"
     },
-    "plugin-api-version": "2.3.0"
+    "plugin-api-version": "2.6.0"
 }
diff --git a/infection.json5 b/infection.json5
index 110754e09a..d534af4cc3 100644
--- a/infection.json5
+++ b/infection.json5
@@ -35,6 +35,6 @@
             ignore: [
                 "Infection\\Mutator\\Boolean\\LogicalOr::canMutate"
             ]
-        }
+        },
     }
 }
diff --git a/src/Console/Application.php b/src/Console/Application.php
index e932bd0acb..504a771d3d 100644
--- a/src/Console/Application.php
+++ b/src/Console/Application.php
@@ -35,6 +35,7 @@
 
 namespace Infection\Console;
 
+use Infection\Command\CustomMutatorCommand;
 use function array_merge;
 use function class_exists;
 use Composer\InstalledVersions;
@@ -104,6 +105,7 @@ protected function getDefaultCommands(): array
                 new ConfigureCommand(),
                 new RunCommand(),
                 new DescribeCommand(),
+                new CustomMutatorCommand(),
             ],
         );
 
diff --git a/tests/phpunit/Mutator/BaseMutatorTestCase.php b/src/Testing/BaseMutatorTestCase.php
similarity index 90%
rename from tests/phpunit/Mutator/BaseMutatorTestCase.php
rename to src/Testing/BaseMutatorTestCase.php
index ff49fd79aa..3bc69871fc 100644
--- a/tests/phpunit/Mutator/BaseMutatorTestCase.php
+++ b/src/Testing/BaseMutatorTestCase.php
@@ -33,27 +33,25 @@
 
 declare(strict_types=1);
 
-namespace Infection\Tests\Mutator;
+namespace Infection\Testing;
 
-use function array_shift;
-use function count;
-use function escapeshellarg;
-use function implode;
 use Infection\Mutator\Mutator;
+use Infection\Mutator\ProfileList;
 use Infection\PhpParser\NodeTraverserFactory;
 use Infection\PhpParser\Visitor\CloneVisitor;
 use Infection\PhpParser\Visitor\MutatorVisitor;
-use Infection\Tests\AutoReview\SourceTestClassNameScheme;
-use Infection\Tests\Fixtures\SimpleMutation;
-use Infection\Tests\Fixtures\SimpleMutationsCollectorVisitor;
-use Infection\Tests\SingletonContainer;
-use Infection\Tests\StringNormalizer;
-use const PHP_EOL;
 use PhpParser\NodeTraverser;
 use PHPUnit\Framework\TestCase;
+use Webmozart\Assert\Assert;
+use function array_flip;
+use function array_key_exists;
+use function array_shift;
+use function count;
+use function escapeshellarg;
+use function implode;
 use function Safe\exec;
 use function sprintf;
-use Webmozart\Assert\Assert;
+use const PHP_EOL;
 
 abstract class BaseMutatorTestCase extends TestCase
 {
@@ -118,17 +116,25 @@ final public function doTest(string $inputCode, $expectedCode = [], array $setti
 
     final protected function createMutator(array $settings = []): Mutator
     {
-        $mutatorClassName = SourceTestClassNameScheme::getSourceClassName(static::class);
+        $mutatorClassName = $this->getTestedMutatorClassName();
+
+        $isBuiltinMutator = array_key_exists($mutatorClassName, array_flip(ProfileList::ALL_MUTATORS));
+        $mutatorName = $isBuiltinMutator ? MutatorName::getName($mutatorClassName) : $mutatorClassName;
 
         // TODO: this is a bit ridicule...
         return SingletonContainer::getContainer()
             ->getMutatorFactory()
             ->create([
                 $mutatorClassName => ['settings' => $settings],
-            ], false)[MutatorName::getName($mutatorClassName)]
+            ], false)[$mutatorName]
         ;
     }
 
+    protected function getTestedMutatorClassName(): string
+    {
+        return SourceTestClassNameScheme::getSourceClassName(static::class);
+    }
+
     /**
      * @return string[]
      */
@@ -189,7 +195,7 @@ private function assertSyntaxIsValid(string $realMutatedCode): void
             $returnCode,
             sprintf(
                 'Mutator %s produces invalid code',
-                $this->createMutator()->getName(),
+                $this->mutator->getName(),
             ),
         );
     }
diff --git a/tests/phpunit/Mutator/MutatorName.php b/src/Testing/MutatorName.php
similarity index 98%
rename from tests/phpunit/Mutator/MutatorName.php
rename to src/Testing/MutatorName.php
index 6eaa4aae4d..da70e9517d 100644
--- a/tests/phpunit/Mutator/MutatorName.php
+++ b/src/Testing/MutatorName.php
@@ -33,12 +33,12 @@
 
 declare(strict_types=1);
 
-namespace Infection\Tests\Mutator;
+namespace Infection\Testing;
 
-use function array_flip;
 use Infection\CannotBeInstantiated;
 use Infection\Mutator\ProfileList;
 use Webmozart\Assert\Assert;
+use function array_flip;
 
 final class MutatorName
 {
diff --git a/tests/phpunit/Fixtures/SimpleMutation.php b/src/Testing/SimpleMutation.php
similarity index 96%
rename from tests/phpunit/Fixtures/SimpleMutation.php
rename to src/Testing/SimpleMutation.php
index fb25008837..0aac9c95f2 100644
--- a/tests/phpunit/Fixtures/SimpleMutation.php
+++ b/src/Testing/SimpleMutation.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace Infection\Tests\Fixtures;
+namespace Infection\Testing;
 
 use Infection\Mutation\Mutation;
 use Infection\Mutator\Mutator;
diff --git a/tests/phpunit/Fixtures/SimpleMutationsCollectorVisitor.php b/src/Testing/SimpleMutationsCollectorVisitor.php
similarity index 97%
rename from tests/phpunit/Fixtures/SimpleMutationsCollectorVisitor.php
rename to src/Testing/SimpleMutationsCollectorVisitor.php
index f2cee37197..08f5d52c1d 100644
--- a/tests/phpunit/Fixtures/SimpleMutationsCollectorVisitor.php
+++ b/src/Testing/SimpleMutationsCollectorVisitor.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace Infection\Tests\Fixtures;
+namespace Infection\Testing;
 
 use Infection\Mutator\Mutator;
 use Infection\PhpParser\MutatedNode;
diff --git a/tests/phpunit/SingletonContainer.php b/src/Testing/SingletonContainer.php
similarity index 98%
rename from tests/phpunit/SingletonContainer.php
rename to src/Testing/SingletonContainer.php
index 531c3d7482..45772a59fc 100644
--- a/tests/phpunit/SingletonContainer.php
+++ b/src/Testing/SingletonContainer.php
@@ -33,7 +33,7 @@
 
 declare(strict_types=1);
 
-namespace Infection\Tests;
+namespace Infection\Testing;
 
 use Infection\Container;
 use Infection\Tests\AutoReview\PhpDoc\PHPDocParser;
diff --git a/tests/phpunit/AutoReview/SourceTestClassNameScheme.php b/src/Testing/SourceTestClassNameScheme.php
similarity index 98%
rename from tests/phpunit/AutoReview/SourceTestClassNameScheme.php
rename to src/Testing/SourceTestClassNameScheme.php
index 92aabb4f66..d58bb25e9f 100644
--- a/tests/phpunit/AutoReview/SourceTestClassNameScheme.php
+++ b/src/Testing/SourceTestClassNameScheme.php
@@ -33,7 +33,7 @@
 
 declare(strict_types=1);
 
-namespace Infection\Tests\AutoReview;
+namespace Infection\Testing;
 
 use Infection\CannotBeInstantiated;
 use function Safe\preg_match;
diff --git a/tests/phpunit/StringNormalizer.php b/src/Testing/StringNormalizer.php
similarity index 98%
rename from tests/phpunit/StringNormalizer.php
rename to src/Testing/StringNormalizer.php
index 5a9ac3ad04..954f1cbf50 100644
--- a/tests/phpunit/StringNormalizer.php
+++ b/src/Testing/StringNormalizer.php
@@ -33,12 +33,12 @@
 
 declare(strict_types=1);
 
-namespace Infection\Tests;
+namespace Infection\Testing;
 
+use Infection\CannotBeInstantiated;
 use function array_map;
 use function explode;
 use function implode;
-use Infection\CannotBeInstantiated;
 
 final class StringNormalizer
 {
diff --git a/tests/phpunit/AutoReview/ContainerTest.php b/tests/phpunit/AutoReview/ContainerTest.php
index 058dd521b4..617f496261 100644
--- a/tests/phpunit/AutoReview/ContainerTest.php
+++ b/tests/phpunit/AutoReview/ContainerTest.php
@@ -35,18 +35,18 @@
 
 namespace Infection\Tests\AutoReview;
 
-use function array_map;
-use function in_array;
+use Infection\Testing\SingletonContainer;
 use Infection\Tests\AutoReview\ProjectCode\ProjectCodeProvider;
-use Infection\Tests\SingletonContainer;
 use PHPUnit\Framework\Attributes\CoversNothing;
 use PHPUnit\Framework\Attributes\DataProviderExternal;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
+use Symfony\Component\Filesystem\Path;
+use function array_map;
+use function in_array;
 use function Safe\file_get_contents;
 use function sprintf;
 use function strpos;
-use Symfony\Component\Filesystem\Path;
 
 #[CoversNothing]
 final class ContainerTest extends TestCase
diff --git a/tests/phpunit/AutoReview/EnvVariableManipulation/EnvTestCasesProvider.php b/tests/phpunit/AutoReview/EnvVariableManipulation/EnvTestCasesProvider.php
index be5ba99145..f4703a7835 100644
--- a/tests/phpunit/AutoReview/EnvVariableManipulation/EnvTestCasesProvider.php
+++ b/tests/phpunit/AutoReview/EnvVariableManipulation/EnvTestCasesProvider.php
@@ -35,18 +35,18 @@
 
 namespace Infection\Tests\AutoReview\EnvVariableManipulation;
 
+use Infection\CannotBeInstantiated;
+use Infection\Testing\SourceTestClassNameScheme;
+use Infection\Tests\AutoReview\ProjectCode\ProjectCodeProvider;
+use PHPUnit\Framework\TestCase;
+use ReflectionClass;
+use Webmozart\Assert\Assert;
 use function array_filter;
 use function array_map;
 use function array_values;
 use function class_exists;
-use Infection\CannotBeInstantiated;
-use Infection\Tests\AutoReview\ProjectCode\ProjectCodeProvider;
-use Infection\Tests\AutoReview\SourceTestClassNameScheme;
 use function iterator_to_array;
-use PHPUnit\Framework\TestCase;
-use ReflectionClass;
 use function Safe\file_get_contents;
-use Webmozart\Assert\Assert;
 
 final class EnvTestCasesProvider
 {
diff --git a/tests/phpunit/AutoReview/IntegrationGroup/IntegrationGroupProvider.php b/tests/phpunit/AutoReview/IntegrationGroup/IntegrationGroupProvider.php
index 1301863b09..3d8ef7520b 100644
--- a/tests/phpunit/AutoReview/IntegrationGroup/IntegrationGroupProvider.php
+++ b/tests/phpunit/AutoReview/IntegrationGroup/IntegrationGroupProvider.php
@@ -35,20 +35,20 @@
 
 namespace Infection\Tests\AutoReview\IntegrationGroup;
 
-use function array_filter;
-use function array_map;
-use function array_values;
-use function class_exists;
 use Infection\CannotBeInstantiated;
+use Infection\Testing\SourceTestClassNameScheme;
 use Infection\Tests\AutoReview\ProjectCode\ProjectCodeProvider;
-use Infection\Tests\AutoReview\SourceTestClassNameScheme;
 use Infection\Tests\Console\E2ETest;
 use Infection\Tests\FileSystem\FileSystemTestCase;
-use function iterator_to_array;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
-use function Safe\file_get_contents;
 use Webmozart\Assert\Assert;
+use function array_filter;
+use function array_map;
+use function array_values;
+use function class_exists;
+use function iterator_to_array;
+use function Safe\file_get_contents;
 
 final class IntegrationGroupProvider
 {
diff --git a/tests/phpunit/AutoReview/ProjectCode/ProjectCodeTest.php b/tests/phpunit/AutoReview/ProjectCode/ProjectCodeTest.php
index 02998130b8..36449e25fd 100644
--- a/tests/phpunit/AutoReview/ProjectCode/ProjectCodeTest.php
+++ b/tests/phpunit/AutoReview/ProjectCode/ProjectCodeTest.php
@@ -35,21 +35,21 @@
 
 namespace Infection\Tests\AutoReview\ProjectCode;
 
+use Infection\StreamWrapper\IncludeInterceptor;
+use Infection\Testing\SingletonContainer;
+use Infection\Testing\SourceTestClassNameScheme;
+use PHPUnit\Framework\Attributes\CoversNothing;
+use PHPUnit\Framework\Attributes\DataProviderExternal;
+use PHPUnit\Framework\TestCase;
+use ReflectionClass;
+use ReflectionProperty;
 use function array_filter;
 use function array_flip;
 use function array_key_exists;
 use function array_map;
 use function class_exists;
 use function in_array;
-use Infection\StreamWrapper\IncludeInterceptor;
-use Infection\Tests\AutoReview\SourceTestClassNameScheme;
-use Infection\Tests\SingletonContainer;
 use function is_executable;
-use PHPUnit\Framework\Attributes\CoversNothing;
-use PHPUnit\Framework\Attributes\DataProviderExternal;
-use PHPUnit\Framework\TestCase;
-use ReflectionClass;
-use ReflectionProperty;
 use function sprintf;
 
 /**
diff --git a/tests/phpunit/AutoReview/SourceTestClassNameSchemeTest.php b/tests/phpunit/AutoReview/SourceTestClassNameSchemeTest.php
index 4b6d88c5b1..91144429bc 100644
--- a/tests/phpunit/AutoReview/SourceTestClassNameSchemeTest.php
+++ b/tests/phpunit/AutoReview/SourceTestClassNameSchemeTest.php
@@ -35,6 +35,7 @@
 
 namespace Infection\Tests\AutoReview;
 
+use Infection\Testing\SourceTestClassNameScheme;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
 
diff --git a/tests/phpunit/Command/DescribeCommandTest.php b/tests/phpunit/Command/DescribeCommandTest.php
index de66aaebca..40ce426251 100644
--- a/tests/phpunit/Command/DescribeCommandTest.php
+++ b/tests/phpunit/Command/DescribeCommandTest.php
@@ -37,7 +37,7 @@
 
 use Infection\Command\DescribeCommand;
 use Infection\Console\Application;
-use Infection\Tests\SingletonContainer;
+use Infection\Testing\SingletonContainer;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Console\Tester\CommandTester;
diff --git a/tests/phpunit/Command/RunCommandTest.php b/tests/phpunit/Command/RunCommandTest.php
index b646430a2a..47261ba942 100644
--- a/tests/phpunit/Command/RunCommandTest.php
+++ b/tests/phpunit/Command/RunCommandTest.php
@@ -37,7 +37,7 @@
 
 use Infection\Command\RunCommand;
 use Infection\Console\Application;
-use Infection\Tests\SingletonContainer;
+use Infection\Testing\SingletonContainer;
 use InvalidArgumentException;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\Group;
diff --git a/tests/phpunit/Configuration/ConfigurationFactoryTest.php b/tests/phpunit/Configuration/ConfigurationFactoryTest.php
index 5bf4401e4b..c422d9b159 100644
--- a/tests/phpunit/Configuration/ConfigurationFactoryTest.php
+++ b/tests/phpunit/Configuration/ConfigurationFactoryTest.php
@@ -55,9 +55,8 @@
 use Infection\Mutator\NoopMutator;
 use Infection\Mutator\Removal\MethodCallRemoval;
 use Infection\TestFramework\MapSourceClassToTestStrategy;
+use Infection\Testing\SingletonContainer;
 use Infection\Tests\Fixtures\DummyCiDetector;
-use function Infection\Tests\normalizePath;
-use Infection\Tests\SingletonContainer;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
@@ -65,6 +64,7 @@
 use Prophecy\PhpUnit\ProphecyTrait;
 use Prophecy\Prophecy\ObjectProphecy;
 use Symfony\Component\Finder\SplFileInfo;
+use function Infection\Tests\normalizePath;
 use function sys_get_temp_dir;
 
 #[Group('integration')]
diff --git a/tests/phpunit/Console/E2ETest.php b/tests/phpunit/Console/E2ETest.php
index 69876473a7..7c9b4239ae 100644
--- a/tests/phpunit/Console/E2ETest.php
+++ b/tests/phpunit/Console/E2ETest.php
@@ -35,31 +35,32 @@
 
 namespace Infection\Tests\Console;
 
-use function array_merge;
-use function basename;
 use Composer\Autoload\ClassLoader;
-use const DIRECTORY_SEPARATOR;
-use function extension_loaded;
-use function file_exists;
-use function function_exists;
-use function getenv;
-use function implode;
 use Infection\Command\ConfigureCommand;
 use Infection\Console\Application;
 use Infection\Console\E2E;
 use Infection\FileSystem\Finder\ComposerExecutableFinder;
 use Infection\FileSystem\Finder\Exception\FinderException;
-use Infection\Tests\SingletonContainer;
-use function is_readable;
-use const PHP_EOL;
-use const PHP_OS;
-use const PHP_SAPI;
+use Infection\Testing\SingletonContainer;
 use PHPUnit\Framework\Attributes\CoversNothing;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\Attributes\Large;
 use PHPUnit\Framework\Attributes\RunInSeparateProcess;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Input\ArgvInput;
+use Symfony\Component\Console\Output\BufferedOutput;
+use Symfony\Component\Finder\Finder;
+use Symfony\Component\Process\Exception\ProcessTimedOutException;
+use Symfony\Component\Process\Process;
+use function array_merge;
+use function basename;
+use function extension_loaded;
+use function file_exists;
+use function function_exists;
+use function getenv;
+use function implode;
+use function is_readable;
 use function Safe\chdir;
 use function Safe\copy;
 use function Safe\file_get_contents;
@@ -69,11 +70,10 @@
 use function str_contains;
 use function str_replace;
 use function str_starts_with;
-use Symfony\Component\Console\Input\ArgvInput;
-use Symfony\Component\Console\Output\BufferedOutput;
-use Symfony\Component\Finder\Finder;
-use Symfony\Component\Process\Exception\ProcessTimedOutException;
-use Symfony\Component\Process\Process;
+use const DIRECTORY_SEPARATOR;
+use const PHP_EOL;
+use const PHP_OS;
+use const PHP_SAPI;
 
 #[Group('e2e')]
 #[Group('integration')]
diff --git a/tests/phpunit/ContainerTest.php b/tests/phpunit/ContainerTest.php
index 4e320fe564..a4f9d32175 100644
--- a/tests/phpunit/ContainerTest.php
+++ b/tests/phpunit/ContainerTest.php
@@ -37,6 +37,7 @@
 
 use Infection\Container;
 use Infection\FileSystem\Locator\FileNotFound;
+use Infection\Testing\SingletonContainer;
 use InvalidArgumentException;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\Group;
diff --git a/tests/phpunit/Logger/CreateMetricsCalculator.php b/tests/phpunit/Logger/CreateMetricsCalculator.php
index 2e7521c214..965e4a539b 100644
--- a/tests/phpunit/Logger/CreateMetricsCalculator.php
+++ b/tests/phpunit/Logger/CreateMetricsCalculator.php
@@ -42,7 +42,7 @@
 use Infection\Mutant\MutantExecutionResult;
 use Infection\Mutator\Loop\For_;
 use Infection\Mutator\Regex\PregQuote;
-use Infection\Tests\Mutator\MutatorName;
+use Infection\Testing\MutatorName;
 use function Infection\Tests\normalize_trailing_spaces;
 use function Later\now;
 
diff --git a/tests/phpunit/Logger/Html/StrykerHtmlReportBuilderTest.php b/tests/phpunit/Logger/Html/StrykerHtmlReportBuilderTest.php
index 5343f0c10a..0648d65e38 100644
--- a/tests/phpunit/Logger/Html/StrykerHtmlReportBuilderTest.php
+++ b/tests/phpunit/Logger/Html/StrykerHtmlReportBuilderTest.php
@@ -35,8 +35,6 @@
 
 namespace Infection\Tests\Logger\Html;
 
-use function array_map;
-use function implode;
 use Infection\AbstractTestFramework\Coverage\TestLocation;
 use Infection\Logger\Html\StrykerHtmlReportBuilder;
 use Infection\Metrics\Collector;
@@ -47,21 +45,23 @@
 use Infection\Mutator\FunctionSignature\PublicVisibility;
 use Infection\Mutator\Removal\ArrayItemRemoval;
 use Infection\Mutator\Removal\MethodCallRemoval;
-use Infection\Tests\Mutator\MutatorName;
-use function Infection\Tests\normalize_trailing_spaces;
+use Infection\Testing\MutatorName;
 use JsonSchema\Validator;
-use function Later\now;
-use const PHP_EOL;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\TestCase;
+use function array_map;
+use function implode;
+use function Infection\Tests\normalize_trailing_spaces;
+use function Later\now;
 use function Safe\base64_decode;
 use function Safe\file_get_contents;
 use function Safe\json_decode;
 use function Safe\json_encode;
 use function Safe\realpath;
 use function sprintf;
+use const PHP_EOL;
 
 #[Group('integration')]
 #[CoversClass(StrykerHtmlReportBuilder::class)]
diff --git a/tests/phpunit/Metrics/CreateMutantExecutionResult.php b/tests/phpunit/Metrics/CreateMutantExecutionResult.php
index bad452df4d..8300e266a2 100644
--- a/tests/phpunit/Metrics/CreateMutantExecutionResult.php
+++ b/tests/phpunit/Metrics/CreateMutantExecutionResult.php
@@ -38,10 +38,10 @@
 use Infection\Metrics\Collector;
 use Infection\Mutant\MutantExecutionResult;
 use Infection\Mutator\Loop\For_;
-use Infection\Tests\Mutator\MutatorName;
+use Infection\Testing\MutatorName;
 use function Later\now;
-use const PHP_EOL;
 use function str_replace;
+use const PHP_EOL;
 
 trait CreateMutantExecutionResult
 {
diff --git a/tests/phpunit/Metrics/SortableMutantExecutionResultsTest.php b/tests/phpunit/Metrics/SortableMutantExecutionResultsTest.php
index fcae4218f5..8b607cd6fd 100644
--- a/tests/phpunit/Metrics/SortableMutantExecutionResultsTest.php
+++ b/tests/phpunit/Metrics/SortableMutantExecutionResultsTest.php
@@ -39,11 +39,11 @@
 use Infection\Mutant\DetectionStatus;
 use Infection\Mutant\MutantExecutionResult;
 use Infection\Mutator\Loop\For_;
-use Infection\Tests\Mutator\MutatorName;
-use function Later\now;
+use Infection\Testing\MutatorName;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
+use function Later\now;
 
 #[CoversClass(SortableMutantExecutionResults::class)]
 final class SortableMutantExecutionResultsTest extends TestCase
diff --git a/tests/phpunit/Mutant/MutantCodeFactoryTest.php b/tests/phpunit/Mutant/MutantCodeFactoryTest.php
index 000474b0f9..1d04014b71 100644
--- a/tests/phpunit/Mutant/MutantCodeFactoryTest.php
+++ b/tests/phpunit/Mutant/MutantCodeFactoryTest.php
@@ -39,8 +39,8 @@
 use Infection\Mutation\Mutation;
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\PhpParser\MutatedNode;
-use Infection\Tests\Mutator\MutatorName;
-use Infection\Tests\SingletonContainer;
+use Infection\Testing\MutatorName;
+use Infection\Testing\SingletonContainer;
 use PhpParser\Node;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
diff --git a/tests/phpunit/Mutant/MutantExecutionResultFactoryTest.php b/tests/phpunit/Mutant/MutantExecutionResultFactoryTest.php
index c61bfd4313..3b792017ce 100644
--- a/tests/phpunit/Mutant/MutantExecutionResultFactoryTest.php
+++ b/tests/phpunit/Mutant/MutantExecutionResultFactoryTest.php
@@ -43,7 +43,7 @@
 use Infection\Mutator\Loop\For_;
 use Infection\PhpParser\MutatedNode;
 use Infection\Process\MutantProcess;
-use Infection\Tests\Mutator\MutatorName;
+use Infection\Testing\MutatorName;
 use PhpParser\Node\Stmt\Nop;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\MockObject\MockObject;
diff --git a/tests/phpunit/Mutant/MutantExecutionResultTest.php b/tests/phpunit/Mutant/MutantExecutionResultTest.php
index bd34ebc0c1..d1ea5194d0 100644
--- a/tests/phpunit/Mutant/MutantExecutionResultTest.php
+++ b/tests/phpunit/Mutant/MutantExecutionResultTest.php
@@ -41,11 +41,11 @@
 use Infection\Mutation\Mutation;
 use Infection\Mutator\Loop\For_;
 use Infection\PhpParser\MutatedNode;
-use Infection\Tests\Mutator\MutatorName;
-use function Later\now;
+use Infection\Testing\MutatorName;
 use PhpParser\Node\Stmt\Nop;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
+use function Later\now;
 
 #[CoversClass(MutantExecutionResult::class)]
 final class MutantExecutionResultTest extends TestCase
diff --git a/tests/phpunit/Mutant/MutantFactoryTest.php b/tests/phpunit/Mutant/MutantFactoryTest.php
index ffa697548d..b8d18950b2 100644
--- a/tests/phpunit/Mutant/MutantFactoryTest.php
+++ b/tests/phpunit/Mutant/MutantFactoryTest.php
@@ -42,7 +42,7 @@
 use Infection\Mutation\Mutation;
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\PhpParser\MutatedNode;
-use Infection\Tests\Mutator\MutatorName;
+use Infection\Testing\MutatorName;
 use PhpParser\Node;
 use PhpParser\PrettyPrinterAbstract;
 use PHPUnit\Framework\Attributes\CoversClass;
diff --git a/tests/phpunit/Mutant/MutantTest.php b/tests/phpunit/Mutant/MutantTest.php
index bf132f7253..e12824e377 100644
--- a/tests/phpunit/Mutant/MutantTest.php
+++ b/tests/phpunit/Mutant/MutantTest.php
@@ -40,12 +40,12 @@
 use Infection\Mutation\Mutation;
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\PhpParser\MutatedNode;
-use Infection\Tests\Mutator\MutatorName;
-use function Later\now;
+use Infection\Testing\MutatorName;
 use PhpParser\Node;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
+use function Later\now;
 
 #[CoversClass(Mutant::class)]
 final class MutantTest extends TestCase
diff --git a/tests/phpunit/Mutation/FileMutationGeneratorTest.php b/tests/phpunit/Mutation/FileMutationGeneratorTest.php
index 0f55f43dcb..51cd0ef459 100644
--- a/tests/phpunit/Mutation/FileMutationGeneratorTest.php
+++ b/tests/phpunit/Mutation/FileMutationGeneratorTest.php
@@ -35,7 +35,6 @@
 
 namespace Infection\Tests\Mutation;
 
-use function current;
 use Infection\Differ\FilesDiffChangedLines;
 use Infection\Mutation\FileMutationGenerator;
 use Infection\Mutation\Mutation;
@@ -47,18 +46,19 @@
 use Infection\PhpParser\Visitor\MutationCollectorVisitor;
 use Infection\TestFramework\Coverage\LineRangeCalculator;
 use Infection\TestFramework\Coverage\Trace;
+use Infection\Testing\MutatorName;
+use Infection\Testing\SingletonContainer;
 use Infection\Tests\Fixtures\PhpParser\FakeIgnorer;
 use Infection\Tests\Fixtures\PhpParser\FakeNode;
-use Infection\Tests\Mutator\MutatorName;
-use Infection\Tests\SingletonContainer;
-use function iterator_to_array;
 use PhpParser\NodeTraverserInterface;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
-use function sprintf;
 use Symfony\Component\Finder\SplFileInfo;
+use function current;
+use function iterator_to_array;
+use function sprintf;
 
 #[CoversClass(FileMutationGenerator::class)]
 final class FileMutationGeneratorTest extends TestCase
diff --git a/tests/phpunit/Mutation/MutationTest.php b/tests/phpunit/Mutation/MutationTest.php
index 8ea7bd689e..470e23b325 100644
--- a/tests/phpunit/Mutation/MutationTest.php
+++ b/tests/phpunit/Mutation/MutationTest.php
@@ -35,17 +35,17 @@
 
 namespace Infection\Tests\Mutation;
 
-use function array_merge;
 use Infection\AbstractTestFramework\Coverage\TestLocation;
 use Infection\Mutation\Mutation;
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\PhpParser\MutatedNode;
-use Infection\Tests\Mutator\MutatorName;
-use function md5;
+use Infection\Testing\MutatorName;
 use PhpParser\Node;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
+use function array_merge;
+use function md5;
 
 #[CoversClass(Mutation::class)]
 final class MutationTest extends TestCase
diff --git a/tests/phpunit/Mutator/Arithmetic/AssignmentEqualTest.php b/tests/phpunit/Mutator/Arithmetic/AssignmentEqualTest.php
index 3c1a5af0c0..aee74901f6 100644
--- a/tests/phpunit/Mutator/Arithmetic/AssignmentEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/AssignmentEqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\AssignmentEqual;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/AssignmentTest.php b/tests/phpunit/Mutator/Arithmetic/AssignmentTest.php
index 6fc4807d26..94f7fde654 100644
--- a/tests/phpunit/Mutator/Arithmetic/AssignmentTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/AssignmentTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\Assignment;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/BitwiseAndTest.php b/tests/phpunit/Mutator/Arithmetic/BitwiseAndTest.php
index 009ec8abb6..ece328c4d9 100644
--- a/tests/phpunit/Mutator/Arithmetic/BitwiseAndTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/BitwiseAndTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\BitwiseAnd;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/BitwiseNotTest.php b/tests/phpunit/Mutator/Arithmetic/BitwiseNotTest.php
index 9151bed729..df256195f2 100644
--- a/tests/phpunit/Mutator/Arithmetic/BitwiseNotTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/BitwiseNotTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\BitwiseNot;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/BitwiseOrTest.php b/tests/phpunit/Mutator/Arithmetic/BitwiseOrTest.php
index 228975bead..68d53d4b90 100644
--- a/tests/phpunit/Mutator/Arithmetic/BitwiseOrTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/BitwiseOrTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\BitwiseOr;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/BitwiseXorTest.php b/tests/phpunit/Mutator/Arithmetic/BitwiseXorTest.php
index 0e346e2ad8..83ae63a3ba 100644
--- a/tests/phpunit/Mutator/Arithmetic/BitwiseXorTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/BitwiseXorTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\BitwiseXor;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/DecrementTest.php b/tests/phpunit/Mutator/Arithmetic/DecrementTest.php
index 4c9cd3ef2c..3ae82b3b5e 100644
--- a/tests/phpunit/Mutator/Arithmetic/DecrementTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/DecrementTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\Decrement;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/DivEqualTest.php b/tests/phpunit/Mutator/Arithmetic/DivEqualTest.php
index 7f35ed0a92..b087b68968 100644
--- a/tests/phpunit/Mutator/Arithmetic/DivEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/DivEqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\DivEqual;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/DivisionTest.php b/tests/phpunit/Mutator/Arithmetic/DivisionTest.php
index d482f562d3..7f79841636 100644
--- a/tests/phpunit/Mutator/Arithmetic/DivisionTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/DivisionTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\Division;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/ExponentiationTest.php b/tests/phpunit/Mutator/Arithmetic/ExponentiationTest.php
index 178d9d632b..60b918982c 100644
--- a/tests/phpunit/Mutator/Arithmetic/ExponentiationTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/ExponentiationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\Exponentiation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/IncrementTest.php b/tests/phpunit/Mutator/Arithmetic/IncrementTest.php
index e540b1620f..7edd6e9a6f 100644
--- a/tests/phpunit/Mutator/Arithmetic/IncrementTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/IncrementTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\Increment;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/MinusEqualTest.php b/tests/phpunit/Mutator/Arithmetic/MinusEqualTest.php
index b6f74fb502..6c1eb79890 100644
--- a/tests/phpunit/Mutator/Arithmetic/MinusEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/MinusEqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\MinusEqual;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/MinusTest.php b/tests/phpunit/Mutator/Arithmetic/MinusTest.php
index f470a515fa..ed0929cb6e 100644
--- a/tests/phpunit/Mutator/Arithmetic/MinusTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/MinusTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\Minus;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/ModEqualTest.php b/tests/phpunit/Mutator/Arithmetic/ModEqualTest.php
index 9b0c7a2641..7f072e0ac7 100644
--- a/tests/phpunit/Mutator/Arithmetic/ModEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/ModEqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\ModEqual;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/ModulusTest.php b/tests/phpunit/Mutator/Arithmetic/ModulusTest.php
index 227c0763d8..f6f5de6ddb 100644
--- a/tests/phpunit/Mutator/Arithmetic/ModulusTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/ModulusTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\Modulus;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/MulEqualTest.php b/tests/phpunit/Mutator/Arithmetic/MulEqualTest.php
index 88a16d9091..99aefa4b59 100644
--- a/tests/phpunit/Mutator/Arithmetic/MulEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/MulEqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\MulEqual;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/MultiplicationTest.php b/tests/phpunit/Mutator/Arithmetic/MultiplicationTest.php
index adef66a22a..d5e75654c5 100644
--- a/tests/phpunit/Mutator/Arithmetic/MultiplicationTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/MultiplicationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\Multiplication;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/PlusEqualTest.php b/tests/phpunit/Mutator/Arithmetic/PlusEqualTest.php
index e243a1d37d..ee394aacf3 100644
--- a/tests/phpunit/Mutator/Arithmetic/PlusEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/PlusEqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\PlusEqual;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/PlusTest.php b/tests/phpunit/Mutator/Arithmetic/PlusTest.php
index 3a1ebbf82f..2b79391178 100644
--- a/tests/phpunit/Mutator/Arithmetic/PlusTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/PlusTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\Plus;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PhpParser\Node;
 use PhpParser\Node\Expr\Array_;
 use PhpParser\Node\Scalar\LNumber;
diff --git a/tests/phpunit/Mutator/Arithmetic/PowEqualTest.php b/tests/phpunit/Mutator/Arithmetic/PowEqualTest.php
index 8aed8a7c5c..b10283ff9f 100644
--- a/tests/phpunit/Mutator/Arithmetic/PowEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/PowEqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\PowEqual;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/RoundingFamilyTest.php b/tests/phpunit/Mutator/Arithmetic/RoundingFamilyTest.php
index 62a958b2a9..99eaa74b02 100644
--- a/tests/phpunit/Mutator/Arithmetic/RoundingFamilyTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/RoundingFamilyTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\RoundingFamily;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/ShiftLeftTest.php b/tests/phpunit/Mutator/Arithmetic/ShiftLeftTest.php
index 4a5f7156d9..302031a43e 100644
--- a/tests/phpunit/Mutator/Arithmetic/ShiftLeftTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/ShiftLeftTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\ShiftLeft;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/ShiftRightTest.php b/tests/phpunit/Mutator/Arithmetic/ShiftRightTest.php
index 3c7cf5cb2d..be973d7e95 100644
--- a/tests/phpunit/Mutator/Arithmetic/ShiftRightTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/ShiftRightTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Arithmetic;
 
 use Infection\Mutator\Arithmetic\ShiftRight;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/ArrayItemTest.php b/tests/phpunit/Mutator/Boolean/ArrayItemTest.php
index 99d6cd08dd..418939ee90 100644
--- a/tests/phpunit/Mutator/Boolean/ArrayItemTest.php
+++ b/tests/phpunit/Mutator/Boolean/ArrayItemTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\ArrayItem;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/EqualIdenticalTest.php b/tests/phpunit/Mutator/Boolean/EqualIdenticalTest.php
index 258151a42c..1c796f8417 100644
--- a/tests/phpunit/Mutator/Boolean/EqualIdenticalTest.php
+++ b/tests/phpunit/Mutator/Boolean/EqualIdenticalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\EqualIdentical;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/FalseValueTest.php b/tests/phpunit/Mutator/Boolean/FalseValueTest.php
index d0cb82ec2d..51169caa3f 100644
--- a/tests/phpunit/Mutator/Boolean/FalseValueTest.php
+++ b/tests/phpunit/Mutator/Boolean/FalseValueTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\FalseValue;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PhpParser\Node\Expr\ConstFetch;
 use PhpParser\Node\Name;
 use PHPUnit\Framework\Attributes\CoversClass;
diff --git a/tests/phpunit/Mutator/Boolean/IdenticalEqualTest.php b/tests/phpunit/Mutator/Boolean/IdenticalEqualTest.php
index 6933c2bb76..892f1d9a64 100644
--- a/tests/phpunit/Mutator/Boolean/IdenticalEqualTest.php
+++ b/tests/phpunit/Mutator/Boolean/IdenticalEqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\IdenticalEqual;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/InstanceOf_Test.php b/tests/phpunit/Mutator/Boolean/InstanceOf_Test.php
index 39b1c4db40..2947e47914 100644
--- a/tests/phpunit/Mutator/Boolean/InstanceOf_Test.php
+++ b/tests/phpunit/Mutator/Boolean/InstanceOf_Test.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\InstanceOf_;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/LogicalAndAllSubExprNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalAndAllSubExprNegationTest.php
index 70f0bc7369..d94b94c248 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalAndAllSubExprNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalAndAllSubExprNegationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalAndAllSubExprNegation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/LogicalAndNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalAndNegationTest.php
index 36195e9254..d6f59c6704 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalAndNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalAndNegationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalAndNegation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/LogicalAndSingleSubExprNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalAndSingleSubExprNegationTest.php
index 6a1b97dc77..9ddc94af87 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalAndSingleSubExprNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalAndSingleSubExprNegationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalAndSingleSubExprNegation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/LogicalAndTest.php b/tests/phpunit/Mutator/Boolean/LogicalAndTest.php
index 72d3b6bcc3..40e3e9397e 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalAndTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalAndTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalAnd;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/LogicalLowerAndTest.php b/tests/phpunit/Mutator/Boolean/LogicalLowerAndTest.php
index bdb2e3361d..d9ed19bdb6 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalLowerAndTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalLowerAndTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalLowerAnd;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/LogicalLowerOrTest.php b/tests/phpunit/Mutator/Boolean/LogicalLowerOrTest.php
index 56e8a29b31..58b0f32b92 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalLowerOrTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalLowerOrTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalLowerOr;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/LogicalNotTest.php b/tests/phpunit/Mutator/Boolean/LogicalNotTest.php
index 043805af14..ae84566a0b 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalNotTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalNotTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalNot;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PhpParser\Node\Expr\BooleanNot;
 use PhpParser\Node\Expr\ConstFetch;
 use PhpParser\Node\Name;
diff --git a/tests/phpunit/Mutator/Boolean/LogicalOrAllSubExprNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalOrAllSubExprNegationTest.php
index 927c4d95a5..5c6b35884d 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalOrAllSubExprNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalOrAllSubExprNegationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalOrAllSubExprNegation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/LogicalOrNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalOrNegationTest.php
index ef00b65330..cbc9cf913a 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalOrNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalOrNegationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalOrNegation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/LogicalOrSingleSubExprNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalOrSingleSubExprNegationTest.php
index dfa3acc406..9672ce415a 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalOrSingleSubExprNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalOrSingleSubExprNegationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalOrSingleSubExprNegation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/LogicalOrTest.php b/tests/phpunit/Mutator/Boolean/LogicalOrTest.php
index 2a23cdbe6b..92ca2ed646 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalOrTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalOrTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\LogicalOr;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/NotEqualNotIdenticalTest.php b/tests/phpunit/Mutator/Boolean/NotEqualNotIdenticalTest.php
index 7d761012b7..b120b270b9 100644
--- a/tests/phpunit/Mutator/Boolean/NotEqualNotIdenticalTest.php
+++ b/tests/phpunit/Mutator/Boolean/NotEqualNotIdenticalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\NotEqualNotIdentical;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/NotIdenticalNotEqualTest.php b/tests/phpunit/Mutator/Boolean/NotIdenticalNotEqualTest.php
index 86d0bcfe95..bc6d337a90 100644
--- a/tests/phpunit/Mutator/Boolean/NotIdenticalNotEqualTest.php
+++ b/tests/phpunit/Mutator/Boolean/NotIdenticalNotEqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\NotIdenticalNotEqual;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Boolean/TrueValueTest.php b/tests/phpunit/Mutator/Boolean/TrueValueTest.php
index 2271ce963a..20ebe5f031 100644
--- a/tests/phpunit/Mutator/Boolean/TrueValueTest.php
+++ b/tests/phpunit/Mutator/Boolean/TrueValueTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\TrueValue;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PhpParser\Node\Expr\ConstFetch;
 use PhpParser\Node\Name;
 use PHPUnit\Framework\Attributes\CoversClass;
diff --git a/tests/phpunit/Mutator/Boolean/Yield_Test.php b/tests/phpunit/Mutator/Boolean/Yield_Test.php
index 69bff5f532..140736ab3c 100644
--- a/tests/phpunit/Mutator/Boolean/Yield_Test.php
+++ b/tests/phpunit/Mutator/Boolean/Yield_Test.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Boolean;
 
 use Infection\Mutator\Boolean\Yield_;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Cast/CastArrayTest.php b/tests/phpunit/Mutator/Cast/CastArrayTest.php
index cc78ff8786..d3578694e6 100644
--- a/tests/phpunit/Mutator/Cast/CastArrayTest.php
+++ b/tests/phpunit/Mutator/Cast/CastArrayTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Cast;
 
 use Infection\Mutator\Cast\CastArray;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Cast/CastBoolTest.php b/tests/phpunit/Mutator/Cast/CastBoolTest.php
index c7ab0ebe1b..6724993e4f 100644
--- a/tests/phpunit/Mutator/Cast/CastBoolTest.php
+++ b/tests/phpunit/Mutator/Cast/CastBoolTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Cast;
 
 use Infection\Mutator\Cast\CastBool;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Cast/CastFloatTest.php b/tests/phpunit/Mutator/Cast/CastFloatTest.php
index 1013cfc8bb..1906d59b61 100644
--- a/tests/phpunit/Mutator/Cast/CastFloatTest.php
+++ b/tests/phpunit/Mutator/Cast/CastFloatTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Cast;
 
 use Infection\Mutator\Cast\CastFloat;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Cast/CastIntTest.php b/tests/phpunit/Mutator/Cast/CastIntTest.php
index 21db4acb50..257c0893f1 100644
--- a/tests/phpunit/Mutator/Cast/CastIntTest.php
+++ b/tests/phpunit/Mutator/Cast/CastIntTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Cast;
 
 use Infection\Mutator\Cast\CastInt;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Cast/CastObjectTest.php b/tests/phpunit/Mutator/Cast/CastObjectTest.php
index b6dcfa2684..1fbd0b4d09 100644
--- a/tests/phpunit/Mutator/Cast/CastObjectTest.php
+++ b/tests/phpunit/Mutator/Cast/CastObjectTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Cast;
 
 use Infection\Mutator\Cast\CastObject;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Cast/CastStringTest.php b/tests/phpunit/Mutator/Cast/CastStringTest.php
index 357542104e..5b89a97415 100644
--- a/tests/phpunit/Mutator/Cast/CastStringTest.php
+++ b/tests/phpunit/Mutator/Cast/CastStringTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Cast;
 
 use Infection\Mutator\Cast\CastString;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanOrEqualToTest.php b/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanOrEqualToTest.php
index 9161b50088..3a739ef020 100644
--- a/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanOrEqualToTest.php
+++ b/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanOrEqualToTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalBoundary;
 
 use Infection\Mutator\ConditionalBoundary\GreaterThanOrEqualTo;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanTest.php b/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanTest.php
index e69b95bd67..ef216d959d 100644
--- a/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanTest.php
+++ b/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalBoundary;
 
 use Infection\Mutator\ConditionalBoundary\GreaterThan;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalBoundary/LessThanOrEqualToTest.php b/tests/phpunit/Mutator/ConditionalBoundary/LessThanOrEqualToTest.php
index be8d9bebdb..5f73ea79a2 100644
--- a/tests/phpunit/Mutator/ConditionalBoundary/LessThanOrEqualToTest.php
+++ b/tests/phpunit/Mutator/ConditionalBoundary/LessThanOrEqualToTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalBoundary;
 
 use Infection\Mutator\ConditionalBoundary\LessThanOrEqualTo;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalBoundary/LessThanTest.php b/tests/phpunit/Mutator/ConditionalBoundary/LessThanTest.php
index 9bc92bf675..95ab1d852a 100644
--- a/tests/phpunit/Mutator/ConditionalBoundary/LessThanTest.php
+++ b/tests/phpunit/Mutator/ConditionalBoundary/LessThanTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalBoundary;
 
 use Infection\Mutator\ConditionalBoundary\LessThan;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/EqualTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/EqualTest.php
index 736891eec5..d2fd6625d5 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/EqualTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/EqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalNegotiation;
 
 use Infection\Mutator\ConditionalNegotiation\Equal;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanNegotiationTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanNegotiationTest.php
index b3c907e466..b6cb00e3e2 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanNegotiationTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanNegotiationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalNegotiation;
 
 use Infection\Mutator\ConditionalNegotiation\GreaterThanNegotiation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanOrEqualToNegotiationTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanOrEqualToNegotiationTest.php
index 328f90c704..234958a00f 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanOrEqualToNegotiationTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanOrEqualToNegotiationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalNegotiation;
 
 use Infection\Mutator\ConditionalNegotiation\GreaterThanOrEqualToNegotiation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/IdenticalTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/IdenticalTest.php
index 95ad01cbf6..de9b29a001 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/IdenticalTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/IdenticalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalNegotiation;
 
 use Infection\Mutator\ConditionalNegotiation\Identical;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/LessThanNegotiationTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/LessThanNegotiationTest.php
index 68dbccc37d..59ef525b38 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/LessThanNegotiationTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/LessThanNegotiationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalNegotiation;
 
 use Infection\Mutator\ConditionalNegotiation\LessThanNegotiation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/LessThanOrEqualToNegotiationTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/LessThanOrEqualToNegotiationTest.php
index a071010417..dd2412bb19 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/LessThanOrEqualToNegotiationTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/LessThanOrEqualToNegotiationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalNegotiation;
 
 use Infection\Mutator\ConditionalNegotiation\LessThanOrEqualToNegotiation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/NotEqualTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/NotEqualTest.php
index 4967aba688..36baa5d3c6 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/NotEqualTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/NotEqualTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalNegotiation;
 
 use Infection\Mutator\ConditionalNegotiation\NotEqual;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/NotIdenticalTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/NotIdenticalTest.php
index 1e45db8ee0..4915983336 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/NotIdenticalTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/NotIdenticalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ConditionalNegotiation;
 
 use Infection\Mutator\ConditionalNegotiation\NotIdentical;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/DefinitionTest.php b/tests/phpunit/Mutator/DefinitionTest.php
index aff3b901ec..6d2d97f117 100644
--- a/tests/phpunit/Mutator/DefinitionTest.php
+++ b/tests/phpunit/Mutator/DefinitionTest.php
@@ -35,17 +35,17 @@
 
 namespace Infection\Tests\Mutator;
 
-use function array_diff_key;
-use function array_fill_keys;
-use function array_flip;
 use Infection\Mutator\Definition;
 use Infection\Mutator\Mutator;
 use Infection\Mutator\MutatorCategory;
 use Infection\Mutator\ProfileList;
-use Infection\Tests\SingletonContainer;
+use Infection\Testing\SingletonContainer;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
+use function array_diff_key;
+use function array_fill_keys;
+use function array_flip;
 use function sprintf;
 
 #[CoversClass(Definition::class)]
diff --git a/tests/phpunit/Mutator/Extensions/BCMathTest.php b/tests/phpunit/Mutator/Extensions/BCMathTest.php
index 6a2e44aac2..edbf86e7b7 100644
--- a/tests/phpunit/Mutator/Extensions/BCMathTest.php
+++ b/tests/phpunit/Mutator/Extensions/BCMathTest.php
@@ -35,12 +35,12 @@
 
 namespace Infection\Tests\Mutator\Extensions;
 
-use function array_map;
-use function implode;
 use Infection\Mutator\Extensions\BCMath;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
+use function array_map;
+use function implode;
 use function range;
 use function strtoupper;
 use function ucfirst;
diff --git a/tests/phpunit/Mutator/Extensions/MBStringTest.php b/tests/phpunit/Mutator/Extensions/MBStringTest.php
index d2f4ed3e96..408a616841 100644
--- a/tests/phpunit/Mutator/Extensions/MBStringTest.php
+++ b/tests/phpunit/Mutator/Extensions/MBStringTest.php
@@ -35,11 +35,11 @@
 
 namespace Infection\Tests\Mutator\Extensions;
 
-use function defined;
 use Infection\Mutator\Extensions\MBString;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
+use function defined;
 use function Safe\define;
 
 #[CoversClass(MBString::class)]
diff --git a/tests/phpunit/Mutator/FunctionSignature/ProtectedVisibilityTest.php b/tests/phpunit/Mutator/FunctionSignature/ProtectedVisibilityTest.php
index b5f3ca78ae..5a7d530079 100644
--- a/tests/phpunit/Mutator/FunctionSignature/ProtectedVisibilityTest.php
+++ b/tests/phpunit/Mutator/FunctionSignature/ProtectedVisibilityTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\FunctionSignature;
 
 use Infection\Mutator\FunctionSignature\ProtectedVisibility;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use Infection\Tests\Mutator\MutatorFixturesProvider;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
diff --git a/tests/phpunit/Mutator/FunctionSignature/PublicVisibilityTest.php b/tests/phpunit/Mutator/FunctionSignature/PublicVisibilityTest.php
index 007767c646..3ceeb47173 100644
--- a/tests/phpunit/Mutator/FunctionSignature/PublicVisibilityTest.php
+++ b/tests/phpunit/Mutator/FunctionSignature/PublicVisibilityTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\FunctionSignature;
 
 use Infection\Mutator\FunctionSignature\PublicVisibility;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use Infection\Tests\Mutator\MutatorFixturesProvider;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
diff --git a/tests/phpunit/Mutator/IgnoreMutatorTest.php b/tests/phpunit/Mutator/IgnoreMutatorTest.php
index 2bd350c76d..11d56df1b0 100644
--- a/tests/phpunit/Mutator/IgnoreMutatorTest.php
+++ b/tests/phpunit/Mutator/IgnoreMutatorTest.php
@@ -42,12 +42,13 @@
 use Infection\Mutator\Mutator;
 use Infection\PhpParser\Visitor\ReflectionVisitor;
 use Infection\Reflection\CoreClassReflection;
+use Infection\Testing\MutatorName;
 use Infection\Tests\WithConsecutive;
-use function iterator_to_array;
 use PhpParser\Node;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
+use function iterator_to_array;
 
 #[CoversClass(IgnoreMutator::class)]
 final class IgnoreMutatorTest extends TestCase
diff --git a/tests/phpunit/Mutator/InvalidMutatorTest.php b/tests/phpunit/Mutator/InvalidMutatorTest.php
index 96988cfc07..73b5a24cf9 100644
--- a/tests/phpunit/Mutator/InvalidMutatorTest.php
+++ b/tests/phpunit/Mutator/InvalidMutatorTest.php
@@ -38,6 +38,7 @@
 use Error;
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\Mutator\InvalidMutator;
+use Infection\Testing\MutatorName;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
 
diff --git a/tests/phpunit/Mutator/Loop/DoWhileTest.php b/tests/phpunit/Mutator/Loop/DoWhileTest.php
index 6d1c347ae5..e8aa75116e 100644
--- a/tests/phpunit/Mutator/Loop/DoWhileTest.php
+++ b/tests/phpunit/Mutator/Loop/DoWhileTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Loop;
 
 use Infection\Mutator\Loop\DoWhile;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Loop/For_Test.php b/tests/phpunit/Mutator/Loop/For_Test.php
index 3714d8c900..d102a2f2dd 100644
--- a/tests/phpunit/Mutator/Loop/For_Test.php
+++ b/tests/phpunit/Mutator/Loop/For_Test.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Loop;
 
 use Infection\Mutator\Loop\For_;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Loop/Foreach_Test.php b/tests/phpunit/Mutator/Loop/Foreach_Test.php
index 29afe354e1..ac6954b563 100644
--- a/tests/phpunit/Mutator/Loop/Foreach_Test.php
+++ b/tests/phpunit/Mutator/Loop/Foreach_Test.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Loop;
 
 use Infection\Mutator\Loop\Foreach_;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Loop/While_Test.php b/tests/phpunit/Mutator/Loop/While_Test.php
index bf9a2e9856..a09b39fd01 100644
--- a/tests/phpunit/Mutator/Loop/While_Test.php
+++ b/tests/phpunit/Mutator/Loop/While_Test.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Loop;
 
 use Infection\Mutator\Loop\While_;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/MutatorFactoryTest.php b/tests/phpunit/Mutator/MutatorFactoryTest.php
index 22a94132a6..6961b7dfcd 100644
--- a/tests/phpunit/Mutator/MutatorFactoryTest.php
+++ b/tests/phpunit/Mutator/MutatorFactoryTest.php
@@ -35,9 +35,6 @@
 
 namespace Infection\Tests\Mutator;
 
-use function array_fill_keys;
-use function array_values;
-use function count;
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\Mutator\Boolean\TrueValue;
 use Infection\Mutator\IgnoreMutator;
@@ -47,15 +44,19 @@
 use Infection\Mutator\Sort\Spaceship;
 use Infection\PhpParser\Visitor\ReflectionVisitor;
 use Infection\Reflection\ClassReflection;
-use Infection\Tests\SingletonContainer;
+use Infection\Testing\MutatorName;
+use Infection\Testing\SingletonContainer;
 use InvalidArgumentException;
 use PhpParser\Node;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
-use function sprintf;
 use stdClass;
+use function array_fill_keys;
+use function array_values;
+use function count;
+use function sprintf;
 
 #[CoversClass(MutatorFactory::class)]
 final class MutatorFactoryTest extends TestCase
diff --git a/tests/phpunit/Mutator/MutatorFixturesProvider.php b/tests/phpunit/Mutator/MutatorFixturesProvider.php
index 151d3d337e..6d99a5cb70 100644
--- a/tests/phpunit/Mutator/MutatorFixturesProvider.php
+++ b/tests/phpunit/Mutator/MutatorFixturesProvider.php
@@ -35,15 +35,16 @@
 
 namespace Infection\Tests\Mutator;
 
+use Infection\CannotBeInstantiated;
+use Infection\Testing\BaseMutatorTestCase;
+use Symfony\Component\Filesystem\Path;
+use Webmozart\Assert\Assert;
 use function array_key_exists;
 use function end;
 use function explode;
-use Infection\CannotBeInstantiated;
 use function Safe\file_get_contents;
 use function sprintf;
 use function substr;
-use Symfony\Component\Filesystem\Path;
-use Webmozart\Assert\Assert;
 
 final class MutatorFixturesProvider
 {
diff --git a/tests/phpunit/Mutator/MutatorResolverTest.php b/tests/phpunit/Mutator/MutatorResolverTest.php
index 89392130c0..3dd9ee4775 100644
--- a/tests/phpunit/Mutator/MutatorResolverTest.php
+++ b/tests/phpunit/Mutator/MutatorResolverTest.php
@@ -35,9 +35,6 @@
 
 namespace Infection\Tests\Mutator;
 
-use function array_diff;
-use function array_values;
-use function count;
 use Infection\Mutator\Arithmetic\Minus;
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\Mutator\Boolean\IdenticalEqual;
@@ -50,10 +47,14 @@
 use Infection\Mutator\Number\IncrementInteger;
 use Infection\Mutator\Number\OneZeroFloat;
 use Infection\Mutator\ProfileList;
-use Infection\Tests\SingletonContainer;
+use Infection\Testing\MutatorName;
+use Infection\Testing\SingletonContainer;
 use InvalidArgumentException;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
+use function array_diff;
+use function array_values;
+use function count;
 use function sprintf;
 
 #[CoversClass(MutatorResolver::class)]
diff --git a/tests/phpunit/Mutator/MutatorRobustnessTest.php b/tests/phpunit/Mutator/MutatorRobustnessTest.php
index 21faec2985..913588fea5 100644
--- a/tests/phpunit/Mutator/MutatorRobustnessTest.php
+++ b/tests/phpunit/Mutator/MutatorRobustnessTest.php
@@ -35,21 +35,22 @@
 
 namespace Infection\Tests\Mutator;
 
-use function array_values;
 use Infection\Mutator\Mutator;
 use Infection\Mutator\ProfileList;
 use Infection\PhpParser\NodeTraverserFactory;
+use Infection\Testing\MutatorName;
+use Infection\Testing\SingletonContainer;
 use Infection\Tests\Fixtures\NullMutationVisitor;
-use Infection\Tests\SingletonContainer;
-use function ksort;
 use PHPUnit\Framework\Attributes\CoversNothing;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
-use const SORT_STRING;
-use function sprintf;
 use Symfony\Component\Finder\Finder;
 use Symfony\Component\Finder\SplFileInfo;
 use Throwable;
+use function array_values;
+use function ksort;
+use function sprintf;
+use const SORT_STRING;
 
 #[CoversNothing]
 final class MutatorRobustnessTest extends TestCase
diff --git a/tests/phpunit/Mutator/NoopMutatorTest.php b/tests/phpunit/Mutator/NoopMutatorTest.php
index 40071fed94..3d1c675784 100644
--- a/tests/phpunit/Mutator/NoopMutatorTest.php
+++ b/tests/phpunit/Mutator/NoopMutatorTest.php
@@ -39,11 +39,12 @@
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\Mutator\Mutator;
 use Infection\Mutator\NoopMutator;
-use function iterator_to_array;
+use Infection\Testing\MutatorName;
 use PhpParser\Node;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
+use function iterator_to_array;
 
 #[CoversClass(NoopMutator::class)]
 final class NoopMutatorTest extends TestCase
diff --git a/tests/phpunit/Mutator/Number/DecrementIntegerTest.php b/tests/phpunit/Mutator/Number/DecrementIntegerTest.php
index a5b6fe035e..c64d54379f 100644
--- a/tests/phpunit/Mutator/Number/DecrementIntegerTest.php
+++ b/tests/phpunit/Mutator/Number/DecrementIntegerTest.php
@@ -36,11 +36,11 @@
 namespace Infection\Tests\Mutator\Number;
 
 use Infection\Mutator\Number\DecrementInteger;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
-use const PHP_INT_MAX;
-use const PHP_INT_MIN;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
+use const PHP_INT_MAX;
+use const PHP_INT_MIN;
 
 #[CoversClass(DecrementInteger::class)]
 final class DecrementIntegerTest extends BaseMutatorTestCase
diff --git a/tests/phpunit/Mutator/Number/IncrementIntegerTest.php b/tests/phpunit/Mutator/Number/IncrementIntegerTest.php
index b10bea5c6b..85cdeae644 100644
--- a/tests/phpunit/Mutator/Number/IncrementIntegerTest.php
+++ b/tests/phpunit/Mutator/Number/IncrementIntegerTest.php
@@ -36,11 +36,11 @@
 namespace Infection\Tests\Mutator\Number;
 
 use Infection\Mutator\Number\IncrementInteger;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
-use const PHP_INT_MAX;
-use const PHP_INT_MIN;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
+use const PHP_INT_MAX;
+use const PHP_INT_MIN;
 
 #[CoversClass(IncrementInteger::class)]
 final class IncrementIntegerTest extends BaseMutatorTestCase
diff --git a/tests/phpunit/Mutator/Number/OneZeroFloatTest.php b/tests/phpunit/Mutator/Number/OneZeroFloatTest.php
index 2410a7de51..623d961c48 100644
--- a/tests/phpunit/Mutator/Number/OneZeroFloatTest.php
+++ b/tests/phpunit/Mutator/Number/OneZeroFloatTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Number;
 
 use Infection\Mutator\Number\OneZeroFloat;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/AssignCoalesceTest.php b/tests/phpunit/Mutator/Operator/AssignCoalesceTest.php
index 969c23a487..96e35b72d4 100644
--- a/tests/phpunit/Mutator/Operator/AssignCoalesceTest.php
+++ b/tests/phpunit/Mutator/Operator/AssignCoalesceTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\AssignCoalesce;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/Break_Test.php b/tests/phpunit/Mutator/Operator/Break_Test.php
index c30302029d..38f09c8d54 100644
--- a/tests/phpunit/Mutator/Operator/Break_Test.php
+++ b/tests/phpunit/Mutator/Operator/Break_Test.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\Break_;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/Catch_Test.php b/tests/phpunit/Mutator/Operator/Catch_Test.php
index a5153f2d4f..91cbb533c8 100644
--- a/tests/phpunit/Mutator/Operator/Catch_Test.php
+++ b/tests/phpunit/Mutator/Operator/Catch_Test.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\Catch_;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/CoalesceTest.php b/tests/phpunit/Mutator/Operator/CoalesceTest.php
index 54de123fcd..28573a128d 100644
--- a/tests/phpunit/Mutator/Operator/CoalesceTest.php
+++ b/tests/phpunit/Mutator/Operator/CoalesceTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\Coalesce;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/ConcatTest.php b/tests/phpunit/Mutator/Operator/ConcatTest.php
index b8d6d77337..bf1f759db6 100644
--- a/tests/phpunit/Mutator/Operator/ConcatTest.php
+++ b/tests/phpunit/Mutator/Operator/ConcatTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\Concat;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/Continue_Test.php b/tests/phpunit/Mutator/Operator/Continue_Test.php
index 563bab37d5..2c61c9b004 100644
--- a/tests/phpunit/Mutator/Operator/Continue_Test.php
+++ b/tests/phpunit/Mutator/Operator/Continue_Test.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\Continue_;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/ElseIfNegationTest.php b/tests/phpunit/Mutator/Operator/ElseIfNegationTest.php
index b48cd48858..61ea6eecfa 100644
--- a/tests/phpunit/Mutator/Operator/ElseIfNegationTest.php
+++ b/tests/phpunit/Mutator/Operator/ElseIfNegationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\ElseIfNegation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/Finally_Test.php b/tests/phpunit/Mutator/Operator/Finally_Test.php
index 703178ae9b..0bff1045ad 100644
--- a/tests/phpunit/Mutator/Operator/Finally_Test.php
+++ b/tests/phpunit/Mutator/Operator/Finally_Test.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\Finally_;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/IfNegationTest.php b/tests/phpunit/Mutator/Operator/IfNegationTest.php
index b4ebbf5907..12e84cab23 100644
--- a/tests/phpunit/Mutator/Operator/IfNegationTest.php
+++ b/tests/phpunit/Mutator/Operator/IfNegationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\IfNegation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php b/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php
index 0af28e5216..bf06d58575 100644
--- a/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php
+++ b/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php
@@ -36,10 +36,10 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\NullSafeMethodCall;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
-use const PHP_VERSION_ID;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
+use const PHP_VERSION_ID;
 
 #[CoversClass(NullSafeMethodCall::class)]
 final class NullSafeMethodCallTest extends BaseMutatorTestCase
diff --git a/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php b/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php
index 7af374eae1..ab65e5fbda 100644
--- a/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php
+++ b/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php
@@ -36,10 +36,10 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\NullSafePropertyCall;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
-use const PHP_VERSION_ID;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
+use const PHP_VERSION_ID;
 
 #[CoversClass(NullSafePropertyCall::class)]
 final class NullSafePropertyCallTest extends BaseMutatorTestCase
diff --git a/tests/phpunit/Mutator/Operator/SpreadAssignmentTest.php b/tests/phpunit/Mutator/Operator/SpreadAssignmentTest.php
index 094d8a2f63..cf6f793595 100644
--- a/tests/phpunit/Mutator/Operator/SpreadAssignmentTest.php
+++ b/tests/phpunit/Mutator/Operator/SpreadAssignmentTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\SpreadAssignment;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/SpreadOneItemTest.php b/tests/phpunit/Mutator/Operator/SpreadOneItemTest.php
index b310d466a7..0f34a68f1d 100644
--- a/tests/phpunit/Mutator/Operator/SpreadOneItemTest.php
+++ b/tests/phpunit/Mutator/Operator/SpreadOneItemTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\SpreadOneItem;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/SpreadRemovalTest.php b/tests/phpunit/Mutator/Operator/SpreadRemovalTest.php
index fd90555762..2a83c13777 100644
--- a/tests/phpunit/Mutator/Operator/SpreadRemovalTest.php
+++ b/tests/phpunit/Mutator/Operator/SpreadRemovalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\SpreadRemoval;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Operator/TernaryTest.php b/tests/phpunit/Mutator/Operator/TernaryTest.php
index 7c5fed2713..f85f10c4eb 100644
--- a/tests/phpunit/Mutator/Operator/TernaryTest.php
+++ b/tests/phpunit/Mutator/Operator/TernaryTest.php
@@ -36,10 +36,10 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\Ternary;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
-use const PHP_VERSION_ID;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
+use const PHP_VERSION_ID;
 
 #[CoversClass(Ternary::class)]
 final class TernaryTest extends BaseMutatorTestCase
diff --git a/tests/phpunit/Mutator/Operator/Throw_Test.php b/tests/phpunit/Mutator/Operator/Throw_Test.php
index 47e5308777..d97d7c82ee 100644
--- a/tests/phpunit/Mutator/Operator/Throw_Test.php
+++ b/tests/phpunit/Mutator/Operator/Throw_Test.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Operator;
 
 use Infection\Mutator\Operator\Throw_;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ProfileListTest.php b/tests/phpunit/Mutator/ProfileListTest.php
index 5d51b85afb..450361510a 100644
--- a/tests/phpunit/Mutator/ProfileListTest.php
+++ b/tests/phpunit/Mutator/ProfileListTest.php
@@ -35,15 +35,16 @@
 
 namespace Infection\Tests\Mutator;
 
-use function array_keys;
-use function in_array;
 use Infection\Mutator\ProfileList;
+use Infection\Testing\MutatorName;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProviderExternal;
 use PHPUnit\Framework\TestCase;
+use function array_keys;
+use function in_array;
 use function Safe\sort;
-use const SORT_STRING;
 use function sprintf;
+use const SORT_STRING;
 
 #[CoversClass(ProfileList::class)]
 final class ProfileListTest extends TestCase
diff --git a/tests/phpunit/Mutator/Regex/PregMatchMatchesTest.php b/tests/phpunit/Mutator/Regex/PregMatchMatchesTest.php
index 513b4d3b11..47ce72a565 100644
--- a/tests/phpunit/Mutator/Regex/PregMatchMatchesTest.php
+++ b/tests/phpunit/Mutator/Regex/PregMatchMatchesTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Regex;
 
 use Infection\Mutator\Regex\PregMatchMatches;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Regex/PregMatchRemoveCaretTest.php b/tests/phpunit/Mutator/Regex/PregMatchRemoveCaretTest.php
index ffb940625a..f571362049 100644
--- a/tests/phpunit/Mutator/Regex/PregMatchRemoveCaretTest.php
+++ b/tests/phpunit/Mutator/Regex/PregMatchRemoveCaretTest.php
@@ -37,7 +37,7 @@
 
 use Generator;
 use Infection\Mutator\Regex\PregMatchRemoveCaret;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Regex/PregMatchRemoveDollarTest.php b/tests/phpunit/Mutator/Regex/PregMatchRemoveDollarTest.php
index 63939df868..21697b77fb 100644
--- a/tests/phpunit/Mutator/Regex/PregMatchRemoveDollarTest.php
+++ b/tests/phpunit/Mutator/Regex/PregMatchRemoveDollarTest.php
@@ -37,7 +37,7 @@
 
 use Generator;
 use Infection\Mutator\Regex\PregMatchRemoveDollar;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Regex/PregMatchRemoveFlagsTest.php b/tests/phpunit/Mutator/Regex/PregMatchRemoveFlagsTest.php
index 25ce970f2f..40328075ac 100644
--- a/tests/phpunit/Mutator/Regex/PregMatchRemoveFlagsTest.php
+++ b/tests/phpunit/Mutator/Regex/PregMatchRemoveFlagsTest.php
@@ -37,7 +37,7 @@
 
 use Generator;
 use Infection\Mutator\Regex\PregMatchRemoveFlags;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Regex/PregQuoteTest.php b/tests/phpunit/Mutator/Regex/PregQuoteTest.php
index 736129a9ed..3cd28422a1 100644
--- a/tests/phpunit/Mutator/Regex/PregQuoteTest.php
+++ b/tests/phpunit/Mutator/Regex/PregQuoteTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Regex;
 
 use Infection\Mutator\Regex\PregQuote;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Removal/ArrayItemRemovalTest.php b/tests/phpunit/Mutator/Removal/ArrayItemRemovalTest.php
index 7b7cc63155..5bea76ca23 100644
--- a/tests/phpunit/Mutator/Removal/ArrayItemRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/ArrayItemRemovalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Removal;
 
 use Infection\Mutator\Removal\ArrayItemRemoval;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use Infection\Tests\Mutator\MutatorFixturesProvider;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
diff --git a/tests/phpunit/Mutator/Removal/CatchBlockRemovalTest.php b/tests/phpunit/Mutator/Removal/CatchBlockRemovalTest.php
index 36ebfa0eba..13fd2a532f 100644
--- a/tests/phpunit/Mutator/Removal/CatchBlockRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/CatchBlockRemovalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Removal;
 
 use Infection\Mutator\Removal\CatchBlockRemoval;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Removal/CloneRemovalTest.php b/tests/phpunit/Mutator/Removal/CloneRemovalTest.php
index 3e07b68c2d..bc2514b99e 100644
--- a/tests/phpunit/Mutator/Removal/CloneRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/CloneRemovalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Removal;
 
 use Infection\Mutator\Removal\CloneRemoval;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Removal/ConcatOperandRemovalTest.php b/tests/phpunit/Mutator/Removal/ConcatOperandRemovalTest.php
index 73eda7f8ac..03370d3659 100644
--- a/tests/phpunit/Mutator/Removal/ConcatOperandRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/ConcatOperandRemovalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Removal;
 
 use Infection\Mutator\Removal\ConcatOperandRemoval;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Removal/FunctionCallRemovalTest.php b/tests/phpunit/Mutator/Removal/FunctionCallRemovalTest.php
index b1dfad00c7..fb6f0d1abf 100644
--- a/tests/phpunit/Mutator/Removal/FunctionCallRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/FunctionCallRemovalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Removal;
 
 use Infection\Mutator\Removal\FunctionCallRemoval;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Removal/MatchArmRemovalTest.php b/tests/phpunit/Mutator/Removal/MatchArmRemovalTest.php
index bb307e6059..5eeb3757bf 100644
--- a/tests/phpunit/Mutator/Removal/MatchArmRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/MatchArmRemovalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Removal;
 
 use Infection\Mutator\Removal\MatchArmRemoval;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Removal/MethodCallRemovalTest.php b/tests/phpunit/Mutator/Removal/MethodCallRemovalTest.php
index 69dd56ac0c..83a9c4b84e 100644
--- a/tests/phpunit/Mutator/Removal/MethodCallRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/MethodCallRemovalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Removal;
 
 use Infection\Mutator\Removal\MethodCallRemoval;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Removal/SharedCaseRemovalTest.php b/tests/phpunit/Mutator/Removal/SharedCaseRemovalTest.php
index e831d5d73e..da8987d9a7 100644
--- a/tests/phpunit/Mutator/Removal/SharedCaseRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/SharedCaseRemovalTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Removal;
 
 use Infection\Mutator\Removal\SharedCaseRemoval;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ReturnValue/ArrayOneItemTest.php b/tests/phpunit/Mutator/ReturnValue/ArrayOneItemTest.php
index 8427d0e22f..2abd79db4d 100644
--- a/tests/phpunit/Mutator/ReturnValue/ArrayOneItemTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/ArrayOneItemTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ReturnValue;
 
 use Infection\Mutator\ReturnValue\ArrayOneItem;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use Infection\Tests\Mutator\MutatorFixturesProvider;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
diff --git a/tests/phpunit/Mutator/ReturnValue/FloatNegationTest.php b/tests/phpunit/Mutator/ReturnValue/FloatNegationTest.php
index 08c8fa9ea1..20c9850969 100644
--- a/tests/phpunit/Mutator/ReturnValue/FloatNegationTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/FloatNegationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ReturnValue;
 
 use Infection\Mutator\ReturnValue\FloatNegation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/ReturnValue/FunctionCallTest.php b/tests/phpunit/Mutator/ReturnValue/FunctionCallTest.php
index 32a4e587df..294269b69a 100644
--- a/tests/phpunit/Mutator/ReturnValue/FunctionCallTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/FunctionCallTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ReturnValue;
 
 use Infection\Mutator\ReturnValue\FunctionCall;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use Infection\Tests\Mutator\MutatorFixturesProvider;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
diff --git a/tests/phpunit/Mutator/ReturnValue/IntegerNegationTest.php b/tests/phpunit/Mutator/ReturnValue/IntegerNegationTest.php
index a41a71eb71..1a47318945 100644
--- a/tests/phpunit/Mutator/ReturnValue/IntegerNegationTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/IntegerNegationTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ReturnValue;
 
 use Infection\Mutator\ReturnValue\IntegerNegation;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PhpParser\Node\Scalar\LNumber;
 use PhpParser\Node\Stmt\Return_;
 use PHPUnit\Framework\Attributes\CoversClass;
diff --git a/tests/phpunit/Mutator/ReturnValue/NewObjectTest.php b/tests/phpunit/Mutator/ReturnValue/NewObjectTest.php
index d809bcc8a5..308113f60e 100644
--- a/tests/phpunit/Mutator/ReturnValue/NewObjectTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/NewObjectTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ReturnValue;
 
 use Infection\Mutator\ReturnValue\NewObject;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use Infection\Tests\Mutator\MutatorFixturesProvider;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
diff --git a/tests/phpunit/Mutator/ReturnValue/ThisTest.php b/tests/phpunit/Mutator/ReturnValue/ThisTest.php
index 4113e305bd..0aaae1189a 100644
--- a/tests/phpunit/Mutator/ReturnValue/ThisTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/ThisTest.php
@@ -35,12 +35,12 @@
 
 namespace Infection\Tests\Mutator\ReturnValue;
 
-use Infection\Mutator\ReturnValue\This;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use Infection\Tests\Mutator\MutatorFixturesProvider;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
+use This;
 
 #[Group('integration')]
 #[CoversClass(This::class)]
diff --git a/tests/phpunit/Mutator/ReturnValue/YieldValueTest.php b/tests/phpunit/Mutator/ReturnValue/YieldValueTest.php
index 7f91d20e55..f7823a5bbe 100644
--- a/tests/phpunit/Mutator/ReturnValue/YieldValueTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/YieldValueTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\ReturnValue;
 
 use Infection\Mutator\ReturnValue\YieldValue;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Sort/SpaceshipTest.php b/tests/phpunit/Mutator/Sort/SpaceshipTest.php
index 557d12b09e..e7a2399b12 100644
--- a/tests/phpunit/Mutator/Sort/SpaceshipTest.php
+++ b/tests/phpunit/Mutator/Sort/SpaceshipTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Sort;
 
 use Infection\Mutator\Sort\Spaceship;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/SyntaxErrorTest.php b/tests/phpunit/Mutator/SyntaxErrorTest.php
index 7c81971f39..f25726b306 100644
--- a/tests/phpunit/Mutator/SyntaxErrorTest.php
+++ b/tests/phpunit/Mutator/SyntaxErrorTest.php
@@ -36,6 +36,7 @@
 namespace Infection\Tests\Mutator;
 
 use Infection\Mutator\SyntaxError;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayChangeKeyCaseTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayChangeKeyCaseTest.php
index eb20169a12..ddb354c7ab 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayChangeKeyCaseTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayChangeKeyCaseTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayChangeKeyCase;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayChunkTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayChunkTest.php
index cc7dcafe9d..f6752e03bc 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayChunkTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayChunkTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayChunk;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayColumnTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayColumnTest.php
index 33d91a2508..8d5d9b82a8 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayColumnTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayColumnTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayColumn;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayCombineTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayCombineTest.php
index 728556969f..43bb64c4d9 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayCombineTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayCombineTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayCombine;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffAssocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffAssocTest.php
index c1ba7cd158..855b8d19ff 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffAssocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffAssocTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayDiffAssoc;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffKeyTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffKeyTest.php
index 8d9c6c4b6a..fab79773b9 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffKeyTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffKeyTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayDiffKey;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffTest.php
index 5b34027fd7..19c15eab05 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayDiff;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUassocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUassocTest.php
index a9bd14446f..20272965a4 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUassocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUassocTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayDiffUassoc;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUkeyTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUkeyTest.php
index a385afd7a0..b3bb400a53 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUkeyTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUkeyTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayDiffUkey;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayFilterTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayFilterTest.php
index 49907cb6d0..c8f21d204f 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayFilterTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayFilterTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayFilter;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayFlipTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayFlipTest.php
index 43b5d9551f..b8f784c414 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayFlipTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayFlipTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayFlip;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectAssocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectAssocTest.php
index bc2b5e50ac..bfbd3a4fce 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectAssocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectAssocTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayIntersectAssoc;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectKeyTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectKeyTest.php
index 233d7c8ac4..54edfd2e72 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectKeyTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectKeyTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayIntersectKey;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectTest.php
index b91c5d4673..75d2558b16 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayIntersect;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUassocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUassocTest.php
index 1fba638312..85705903ac 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUassocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUassocTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayIntersectUassoc;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUkeyTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUkeyTest.php
index 40e0917acb..37637e2aa5 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUkeyTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUkeyTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayIntersectUkey;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayKeysTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayKeysTest.php
index 44b1782cb3..c0dc3ddbbf 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayKeysTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayKeysTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayKeys;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMapTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMapTest.php
index 4e5102ee9f..237961581d 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMapTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMapTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayMap;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeRecursiveTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeRecursiveTest.php
index a151376202..387e4764b9 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeRecursiveTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeRecursiveTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayMergeRecursive;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeTest.php
index 0a7ad056aa..d9fe31831c 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayMerge;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayPadTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayPadTest.php
index 1db73fe8d1..80a0a7ff28 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayPadTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayPadTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayPad;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReduceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReduceTest.php
index 530cfa94a6..ff22ecb825 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReduceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReduceTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayReduce;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceRecursiveTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceRecursiveTest.php
index 64ac1d90a9..186f93db42 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceRecursiveTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceRecursiveTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayReplaceRecursive;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceTest.php
index 309a345686..bfb8e90b62 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayReplace;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReverseTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReverseTest.php
index 2f970adaf0..e5506acf29 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReverseTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReverseTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayReverse;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArraySliceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArraySliceTest.php
index d35c0383cd..118caaa48c 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArraySliceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArraySliceTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArraySlice;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArraySpliceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArraySpliceTest.php
index 83ac8bfc14..e78d47198f 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArraySpliceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArraySpliceTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArraySplice;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffAssocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffAssocTest.php
index 7f30c93e7e..fa3ac04cfa 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffAssocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffAssocTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayUdiffAssoc;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffTest.php
index 1b1900d904..a120d0de4d 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayUdiff;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffUassocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffUassocTest.php
index 53950dc4cc..cc21229cbc 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffUassocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffUassocTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayUdiffUassoc;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectAssocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectAssocTest.php
index d6c34fa043..c5a7997965 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectAssocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectAssocTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayUintersectAssoc;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectTest.php
index b504b1b19e..62ac303962 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayUintersect;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectUassocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectUassocTest.php
index ae18353ab7..c1bc9bdb15 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectUassocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectUassocTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayUintersectUassoc;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUniqueTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUniqueTest.php
index 342ed08a6b..9629275a04 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUniqueTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUniqueTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayUnique;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayValuesTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayValuesTest.php
index 54ed3ae097..81e26552dc 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayValuesTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayValuesTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapArrayValues;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapFinallyTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapFinallyTest.php
index 5e7221bd7d..cabca0f87c 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapFinallyTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapFinallyTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapFinally;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapLcFirstTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapLcFirstTest.php
index f457c92b8e..f83454a99d 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapLcFirstTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapLcFirstTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapLcFirst;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapLtrimTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapLtrimTest.php
index 2706456593..75559c7e05 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapLtrimTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapLtrimTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapLtrim;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapRtrimTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapRtrimTest.php
index e563376653..c1edd6ccad 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapRtrimTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapRtrimTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapRtrim;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrIreplaceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrIreplaceTest.php
index f5ed6dd45e..13b6a6038c 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrIreplaceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrIreplaceTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapStrIreplace;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrRepeatTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrRepeatTest.php
index 27c558309a..b2b28f4186 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrRepeatTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrRepeatTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapStrRepeat;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrReplaceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrReplaceTest.php
index c338c53bd6..c34dbd0755 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrReplaceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrReplaceTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapStrReplace;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrRevTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrRevTest.php
index 5a7a228954..bada097e55 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrRevTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrRevTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapStrRev;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrShuffleTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrShuffleTest.php
index 91c2b7ec7f..20f58989ec 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrShuffleTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrShuffleTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapStrShuffle;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrToLowerTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrToLowerTest.php
index b34ba210f0..11407633f5 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrToLowerTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrToLowerTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapStrToLower;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrToUpperTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrToUpperTest.php
index 30e1db220b..ee78c67984 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrToUpperTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrToUpperTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapStrToUpper;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapSubstrTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapSubstrTest.php
index 92c3a6333b..f5e68be8bf 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapSubstrTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapSubstrTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapSubstr;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapTrimTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapTrimTest.php
index f2550a0993..1e9fd41bb2 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapTrimTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapTrimTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapTrim;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapUcFirstTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapUcFirstTest.php
index 0a16ca11bb..2954ead0a1 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapUcFirstTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapUcFirstTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapUcFirst;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapUcWordsTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapUcWordsTest.php
index d3cff552a2..ca3d7d8ace 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapUcWordsTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapUcWordsTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\Mutator\Unwrap;
 
 use Infection\Mutator\Unwrap\UnwrapUcWords;
-use Infection\Tests\Mutator\BaseMutatorTestCase;
+use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 
diff --git a/tests/phpunit/MutatorNameTest.php b/tests/phpunit/MutatorNameTest.php
index 11c75e4203..864333ced2 100644
--- a/tests/phpunit/MutatorNameTest.php
+++ b/tests/phpunit/MutatorNameTest.php
@@ -35,7 +35,7 @@
 
 namespace Infection\Tests;
 
-use Infection\Tests\Mutator\MutatorName;
+use Infection\Testing\MutatorName;
 use Infection\Tests\Mutator\ProfileListProvider;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProviderExternal;
diff --git a/tests/phpunit/PhpParser/FileParserTest.php b/tests/phpunit/PhpParser/FileParserTest.php
index 0ae00b54e5..ee53e58275 100644
--- a/tests/phpunit/PhpParser/FileParserTest.php
+++ b/tests/phpunit/PhpParser/FileParserTest.php
@@ -37,8 +37,8 @@
 
 use Infection\PhpParser\FileParser;
 use Infection\PhpParser\UnparsableFile;
-use Infection\Tests\SingletonContainer;
-use Infection\Tests\StringNormalizer;
+use Infection\Testing\SingletonContainer;
+use Infection\Testing\StringNormalizer;
 use PhpParser\Error;
 use PhpParser\Node;
 use PhpParser\Parser;
@@ -46,9 +46,9 @@
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Finder\SplFileInfo;
 use function Safe\realpath;
 use function sprintf;
-use Symfony\Component\Finder\SplFileInfo;
 
 #[Group('integration')]
 #[CoversClass(FileParser::class)]
diff --git a/tests/phpunit/PhpParser/Visitor/BaseVisitorTestCase.php b/tests/phpunit/PhpParser/Visitor/BaseVisitorTestCase.php
index a1448475a7..c7c67c160d 100644
--- a/tests/phpunit/PhpParser/Visitor/BaseVisitorTestCase.php
+++ b/tests/phpunit/PhpParser/Visitor/BaseVisitorTestCase.php
@@ -35,7 +35,7 @@
 
 namespace Infection\Tests\PhpParser\Visitor;
 
-use Infection\Tests\SingletonContainer;
+use Infection\Testing\SingletonContainer;
 use PhpParser\Node;
 use PhpParser\NodeTraverser;
 use PhpParser\NodeVisitor;
diff --git a/tests/phpunit/PhpParser/Visitor/CloneVisitorTest.php b/tests/phpunit/PhpParser/Visitor/CloneVisitorTest.php
index 15d271ee7e..d50547d20a 100644
--- a/tests/phpunit/PhpParser/Visitor/CloneVisitorTest.php
+++ b/tests/phpunit/PhpParser/Visitor/CloneVisitorTest.php
@@ -36,7 +36,7 @@
 namespace Infection\Tests\PhpParser\Visitor;
 
 use Infection\PhpParser\Visitor\CloneVisitor;
-use Infection\Tests\SingletonContainer;
+use Infection\Testing\SingletonContainer;
 use PhpParser\Node;
 use PhpParser\NodeVisitor;
 use PhpParser\NodeVisitorAbstract;
diff --git a/tests/phpunit/PhpParser/Visitor/IgnoreNode/BaseNodeIgnorerTestCase.php b/tests/phpunit/PhpParser/Visitor/IgnoreNode/BaseNodeIgnorerTestCase.php
index 786fe38dce..4affb3a3ce 100644
--- a/tests/phpunit/PhpParser/Visitor/IgnoreNode/BaseNodeIgnorerTestCase.php
+++ b/tests/phpunit/PhpParser/Visitor/IgnoreNode/BaseNodeIgnorerTestCase.php
@@ -37,7 +37,7 @@
 
 use Infection\PhpParser\Visitor\IgnoreNode\NodeIgnorer;
 use Infection\PhpParser\Visitor\NonMutableNodesIgnorerVisitor;
-use Infection\Tests\SingletonContainer;
+use Infection\Testing\SingletonContainer;
 use PhpParser\NodeTraverser;
 use PhpParser\NodeVisitor;
 use PHPUnit\Framework\TestCase;
diff --git a/tests/phpunit/PhpParser/Visitor/MutatorVisitorTest.php b/tests/phpunit/PhpParser/Visitor/MutatorVisitorTest.php
index 79cf009e16..265d927b0f 100644
--- a/tests/phpunit/PhpParser/Visitor/MutatorVisitorTest.php
+++ b/tests/phpunit/PhpParser/Visitor/MutatorVisitorTest.php
@@ -39,9 +39,9 @@
 use Infection\Mutator\FunctionSignature\PublicVisibility;
 use Infection\PhpParser\MutatedNode;
 use Infection\PhpParser\Visitor\MutatorVisitor;
-use Infection\Tests\Mutator\MutatorName;
-use Infection\Tests\SingletonContainer;
-use Infection\Tests\StringNormalizer;
+use Infection\Testing\MutatorName;
+use Infection\Testing\SingletonContainer;
+use Infection\Testing\StringNormalizer;
 use PhpParser\Node;
 use PhpParser\Node\Stmt\ClassMethod;
 use PhpParser\Node\Stmt\Nop;
diff --git a/tests/phpunit/Process/Factory/MutantProcessFactoryTest.php b/tests/phpunit/Process/Factory/MutantProcessFactoryTest.php
index 71809e530b..7616ccbfbb 100644
--- a/tests/phpunit/Process/Factory/MutantProcessFactoryTest.php
+++ b/tests/phpunit/Process/Factory/MutantProcessFactoryTest.php
@@ -35,7 +35,6 @@
 
 namespace Infection\Tests\Process\Factory;
 
-use function current;
 use Infection\AbstractTestFramework\Coverage\TestLocation;
 use Infection\AbstractTestFramework\TestFrameworkAdapter;
 use Infection\Event\MutantProcessWasFinished;
@@ -45,13 +44,14 @@
 use Infection\Mutator\Loop\For_;
 use Infection\PhpParser\MutatedNode;
 use Infection\Process\Factory\MutantProcessFactory;
+use Infection\Testing\MutatorName;
 use Infection\Tests\Fixtures\Event\EventDispatcherCollector;
 use Infection\Tests\Mutant\MutantBuilder;
-use Infection\Tests\Mutator\MutatorName;
-use const PHP_OS_FAMILY;
 use PhpParser\Node\Stmt\Nop;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
+use function current;
+use const PHP_OS_FAMILY;
 
 #[CoversClass(MutantProcessFactory::class)]
 final class MutantProcessFactoryTest extends TestCase
diff --git a/tests/phpunit/Process/Runner/MutationTestingRunnerTest.php b/tests/phpunit/Process/Runner/MutationTestingRunnerTest.php
index 126c189bf9..c4aaad9581 100644
--- a/tests/phpunit/Process/Runner/MutationTestingRunnerTest.php
+++ b/tests/phpunit/Process/Runner/MutationTestingRunnerTest.php
@@ -35,10 +35,7 @@
 
 namespace Infection\Tests\Process\Runner;
 
-use function array_map;
 use ArrayIterator;
-use function count;
-use function implode;
 use Infection\AbstractTestFramework\Coverage\TestLocation;
 use Infection\Differ\DiffSourceCodeMatcher;
 use Infection\Event\MutantProcessWasFinished;
@@ -53,9 +50,9 @@
 use Infection\Process\MutantProcess;
 use Infection\Process\Runner\MutationTestingRunner;
 use Infection\Process\Runner\ProcessRunner;
+use Infection\Testing\MutatorName;
 use Infection\Tests\Fixtures\Event\EventDispatcherCollector;
 use Infection\Tests\Mutant\MutantBuilder;
-use Infection\Tests\Mutator\MutatorName;
 use Infection\Tests\WithConsecutive;
 use PhpParser\Node\Stmt\Nop;
 use PHPUnit\Framework\Attributes\CoversClass;
@@ -63,8 +60,11 @@
 use PHPUnit\Framework\Constraint\Callback;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
-use function sprintf;
 use Symfony\Component\Filesystem\Filesystem;
+use function array_map;
+use function count;
+use function implode;
+use function sprintf;
 
 #[Group('integration')]
 #[CoversClass(MutationTestingRunner::class)]
diff --git a/tests/phpunit/StringNormalizerTest.php b/tests/phpunit/StringNormalizerTest.php
index 23244f2c76..a208d58a83 100644
--- a/tests/phpunit/StringNormalizerTest.php
+++ b/tests/phpunit/StringNormalizerTest.php
@@ -35,6 +35,7 @@
 
 namespace Infection\Tests;
 
+use Infection\Testing\StringNormalizer;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
diff --git a/tests/phpunit/TestFramework/Coverage/LineRangeCalculatorTest.php b/tests/phpunit/TestFramework/Coverage/LineRangeCalculatorTest.php
index fea7d5504f..6cf29b34a3 100644
--- a/tests/phpunit/TestFramework/Coverage/LineRangeCalculatorTest.php
+++ b/tests/phpunit/TestFramework/Coverage/LineRangeCalculatorTest.php
@@ -37,7 +37,7 @@
 
 use Infection\PhpParser\Visitor\ReflectionVisitor;
 use Infection\TestFramework\Coverage\LineRangeCalculator;
-use Infection\Tests\SingletonContainer;
+use Infection\Testing\SingletonContainer;
 use PhpParser\Node;
 use PhpParser\NodeTraverser;
 use PhpParser\NodeVisitor\ParentConnectingVisitor;

From c1841e451259d49a94e78e3fb8b0cab21b4aa38e Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Mon, 20 May 2024 18:57:18 +0200
Subject: [PATCH 03/25] Update failure message for BaseMutatorTestCase

---
 src/Testing/BaseMutatorTestCase.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Testing/BaseMutatorTestCase.php b/src/Testing/BaseMutatorTestCase.php
index 3bc69871fc..962945014a 100644
--- a/src/Testing/BaseMutatorTestCase.php
+++ b/src/Testing/BaseMutatorTestCase.php
@@ -86,7 +86,7 @@ final public function doTest(string $inputCode, $expectedCode = [], array $setti
             count($mutants),
             $expectedCodeSamples,
             sprintf(
-                'Failed asserting that the number of code samples (%d) equals the number of mutants (%d) created by the mutator. Mutants are: %s',
+                'Failed asserting that the number of code samples (%d) equals the number of mutants (%d) created by the mutator. Make sure mutator is enabled and mutates the source code. Mutants are: %s',
                 count($expectedCodeSamples),
                 count($mutants),
                 StringNormalizer::normalizeString(implode(PHP_EOL, $mutants)),

From e708ea60ce974ea8bb306a2e434fe328d0933269 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Mon, 20 May 2024 19:13:54 +0200
Subject: [PATCH 04/25] Fix autoreview analysis

---
 devTools/phpstan-src-baseline.neon            | 80 +++++++++++++++
 devTools/phpstan-src.neon                     |  2 +
 infection.json5                               |  2 +-
 psalm.xml                                     |  2 +
 src/Command/CustomMutatorCommand.php          | 23 ++---
 src/Console/Application.php                   |  2 +-
 src/CustomMutator/templates/__Name__.php      | 31 ++++++
 src/CustomMutator/templates/__Name__Test.php  | 99 ++++++++++++-------
 src/Testing/BaseMutatorTestCase.php           | 16 +--
 src/Testing/MutatorName.php                   |  5 +-
 src/Testing/SimpleMutation.php                | 41 +++++++-
 .../SimpleMutationsCollectorVisitor.php       | 42 +++++++-
 src/Testing/SingletonContainer.php            |  2 +
 src/Testing/SourceTestClassNameScheme.php     |  3 +
 src/Testing/StringNormalizer.php              |  5 +-
 tests/phpunit/AutoReview/ContainerTest.php    |  6 +-
 .../EnvTestCasesProvider.php                  | 12 +--
 .../IntegrationGroupProvider.php              | 12 +--
 .../ProjectCode/ProjectCodeProvider.php       | 19 ++++
 .../ProjectCode/ProjectCodeTest.php           | 14 +--
 .../ConfigurationFactoryTest.php              |  2 +-
 tests/phpunit/Console/E2ETest.php             | 34 +++----
 .../Html/StrykerHtmlReportBuilderTest.php     | 10 +-
 .../Metrics/CreateMutantExecutionResult.php   |  2 +-
 .../SortableMutantExecutionResultsTest.php    |  2 +-
 .../Mutant/MutantExecutionResultTest.php      |  2 +-
 tests/phpunit/Mutant/MutantTest.php           |  2 +-
 .../Mutation/FileMutationGeneratorTest.php    |  6 +-
 tests/phpunit/Mutation/MutationTest.php       |  4 +-
 tests/phpunit/Mutator/DefinitionTest.php      |  6 +-
 .../phpunit/Mutator/Extensions/BCMathTest.php |  4 +-
 .../Mutator/Extensions/MBStringTest.php       |  2 +-
 tests/phpunit/Mutator/IgnoreMutatorTest.php   |  2 +-
 tests/phpunit/Mutator/MutatorFactoryTest.php  |  8 +-
 .../Mutator/MutatorFixturesProvider.php       |  8 +-
 tests/phpunit/Mutator/MutatorResolverTest.php |  6 +-
 .../phpunit/Mutator/MutatorRobustnessTest.php |  8 +-
 tests/phpunit/Mutator/NoopMutatorTest.php     |  2 +-
 .../Mutator/Number/DecrementIntegerTest.php   |  4 +-
 .../Mutator/Number/IncrementIntegerTest.php   |  4 +-
 .../Operator/NullSafeMethodCallTest.php       |  2 +-
 .../Operator/NullSafePropertyCallTest.php     |  2 +-
 .../phpunit/Mutator/Operator/TernaryTest.php  |  2 +-
 tests/phpunit/Mutator/ProfileListTest.php     |  6 +-
 .../phpunit/Mutator/ReturnValue/ThisTest.php  |  2 +-
 tests/phpunit/PhpParser/FileParserTest.php    |  2 +-
 .../Factory/MutantProcessFactoryTest.php      |  4 +-
 .../Runner/MutationTestingRunnerTest.php      |  8 +-
 48 files changed, 400 insertions(+), 164 deletions(-)

diff --git a/devTools/phpstan-src-baseline.neon b/devTools/phpstan-src-baseline.neon
index 86a3e8bbcd..be32229310 100644
--- a/devTools/phpstan-src-baseline.neon
+++ b/devTools/phpstan-src-baseline.neon
@@ -79,3 +79,83 @@ parameters:
 			message: "#^Cannot access offset 0 on iterable\\<\\(int\\|string\\), string\\>\\|null\\.$#"
 			count: 1
 			path: ../src/TestFramework/VersionParser.php
+
+		-
+			message: "#^Dynamic call to static method PHPUnit\\\\Framework\\\\Assert\\:\\:assertCount\\(\\)\\.$#"
+			count: 1
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Dynamic call to static method PHPUnit\\\\Framework\\\\Assert\\:\\:assertSame\\(\\)\\.$#"
+			count: 2
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Dynamic call to static method PHPUnit\\\\Framework\\\\Assert\\:\\:fail\\(\\)\\.$#"
+			count: 2
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Method Infection\\\\Testing\\\\BaseMutatorTestCase\\:\\:createMutator\\(\\) has parameter \\$settings with no value type specified in iterable type array\\.$#"
+			count: 1
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Method Infection\\\\Testing\\\\BaseMutatorTestCase\\:\\:createMutator\\(\\) return type with generic interface Infection\\\\Mutator\\\\Mutator does not specify its types\\: TNode$#"
+			count: 1
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Method Infection\\\\Testing\\\\BaseMutatorTestCase\\:\\:getMutationsFromCode\\(\\) has parameter \\$settings with no value type specified in iterable type array\\.$#"
+			count: 1
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Method Infection\\\\Testing\\\\BaseMutatorTestCase\\:\\:mutate\\(\\) has parameter \\$settings with no value type specified in iterable type array\\.$#"
+			count: 1
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Parameter \\#1 \\$nodes of method PhpParser\\\\NodeTraverserInterface\\:\\:traverse\\(\\) expects array\\<PhpParser\\\\Node\\>, array\\<PhpParser\\\\Node\\\\Stmt\\>\\|null given\\.$#"
+			count: 1
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Parameter \\#1 \\$resolvedMutators of method Infection\\\\Mutator\\\\MutatorFactory\\:\\:create\\(\\) expects array\\<class\\-string\\<Infection\\\\Mutator\\\\ConfigurableMutator\\<PhpParser\\\\Node\\>\\>, array\\>, non\\-empty\\-array\\<string, array\\{settings\\: array\\}\\> given\\.$#"
+			count: 1
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Parameter \\#2 \\$fileAst of class Infection\\\\Testing\\\\SimpleMutationsCollectorVisitor constructor expects array\\<PhpParser\\\\Node\\>, array\\<PhpParser\\\\Node\\\\Stmt\\>\\|null given\\.$#"
+			count: 1
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Property Infection\\\\Testing\\\\BaseMutatorTestCase\\:\\:\\$mutator with generic interface Infection\\\\Mutator\\\\Mutator does not specify its types\\: TNode$#"
+			count: 1
+			path: ../src/Testing/BaseMutatorTestCase.php
+
+		-
+			message: "#^Class Infection\\\\Testing\\\\SimpleMutation extends @final class Infection\\\\Mutation\\\\Mutation\\.$#"
+			count: 1
+			path: ../src/Testing/SimpleMutation.php
+
+		-
+			message: "#^Infection\\\\Testing\\\\SimpleMutation\\:\\:__construct\\(\\) does not call parent constructor from Infection\\\\Mutation\\\\Mutation\\.$#"
+			count: 1
+			path: ../src/Testing/SimpleMutation.php
+
+		-
+			message: "#^Method Infection\\\\Testing\\\\SimpleMutation\\:\\:__construct\\(\\) has parameter \\$mutator with generic interface Infection\\\\Mutator\\\\Mutator but does not specify its types\\: TNode$#"
+			count: 1
+			path: ../src/Testing/SimpleMutation.php
+
+		-
+			message: "#^Method Infection\\\\Testing\\\\SimpleMutation\\:\\:getMutator\\(\\) return type with generic interface Infection\\\\Mutator\\\\Mutator does not specify its types\\: TNode$#"
+			count: 1
+			path: ../src/Testing/SimpleMutation.php
+
+		-
+			message: "#^Cannot access offset 1 on iterable\\<\\(int\\|string\\), string\\>\\|null\\.$#"
+			count: 1
+			path: ../src/Testing/SourceTestClassNameScheme.php
diff --git a/devTools/phpstan-src.neon b/devTools/phpstan-src.neon
index af3414d5af..8783936185 100644
--- a/devTools/phpstan-src.neon
+++ b/devTools/phpstan-src.neon
@@ -90,6 +90,8 @@ parameters:
         - %currentWorkingDirectory%/src/FileSystem/DummyFileSystem.php
         - %currentWorkingDirectory%/src/FileSystem/DummySymfony5FileSystem.php
         - %currentWorkingDirectory%/src/FileSystem/DummySymfony6FileSystem.php
+        - %currentWorkingDirectory%/src/CustomMutator/templates/__Name__.php
+        - %currentWorkingDirectory%/src/CustomMutator/templates/__Name__Test.php
     stubFiles:
         - phpstan.stub
     treatPhpDocTypesAsCertain: false
diff --git a/infection.json5 b/infection.json5
index d534af4cc3..110754e09a 100644
--- a/infection.json5
+++ b/infection.json5
@@ -35,6 +35,6 @@
             ignore: [
                 "Infection\\Mutator\\Boolean\\LogicalOr::canMutate"
             ]
-        },
+        }
     }
 }
diff --git a/psalm.xml b/psalm.xml
index f506261f03..b71e9a513b 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -13,6 +13,8 @@
         <directory name="src" />
         <ignoreFiles>
             <directory name="src/PhpParser" />
+            <directory name="src/Testing" />
+            <directory name="src/CustomMutator/templates" />
             <directory name="vendor" />
         </ignoreFiles>
     </projectFiles>
diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index 4be8364698..34ece5e66b 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -35,22 +35,17 @@
 
 namespace Infection\Command;
 
-use Symfony\Component\Filesystem\Filesystem;
-use Symfony\Component\Finder\Finder;
-use function array_key_exists;
-use function array_keys;
 use Infection\Console\IO;
-use Infection\Mutator\Definition;
-use Infection\Mutator\Mutator;
-use Infection\Mutator\MutatorResolver;
-use Infection\Mutator\ProfileList;
-use function getcwd;
 use function iterator_to_array;
+use RuntimeException;
+use function Safe\getcwd;
 use function sprintf;
+use function str_replace;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Question\Question;
-use Webmozart\Assert\Assert;
-use function str_replace;
+use Symfony\Component\Finder\Finder;
+use function trim;
+use function ucfirst;
 
 /**
  * @internal
@@ -71,9 +66,9 @@ protected function executeCommand(IO $io): bool
 
         if ($mutator === null) {
             $question = new Question('What mutator do you wish to create (e.g. `AnyStringToInfectedMutator`)?');
-            $question->setValidator(function (string|null $answer): string {
+            $question->setValidator(static function (?string $answer): string {
                 if ($answer === null || trim($answer) === '') {
-                    throw new \RuntimeException('Mutator name is mandaory.');
+                    throw new RuntimeException('Mutator name is mandaory.');
                 }
 
                 return $answer;
@@ -112,7 +107,7 @@ protected function executeCommand(IO $io): bool
         $io->title('Generated files');
         $io->listing($generatedFilePaths);
         $io->success(
-            sprintf('Base classes for the "%s" mutator were created. Complee the missing parts inside them.', $mutator)
+            sprintf('Base classes for the "%s" mutator were created. Complee the missing parts inside them.', $mutator),
         );
 
         return true;
diff --git a/src/Console/Application.php b/src/Console/Application.php
index 504a771d3d..ae3d0f72b7 100644
--- a/src/Console/Application.php
+++ b/src/Console/Application.php
@@ -35,11 +35,11 @@
 
 namespace Infection\Console;
 
-use Infection\Command\CustomMutatorCommand;
 use function array_merge;
 use function class_exists;
 use Composer\InstalledVersions;
 use Infection\Command\ConfigureCommand;
+use Infection\Command\CustomMutatorCommand;
 use Infection\Command\DescribeCommand;
 use Infection\Command\RunCommand;
 use Infection\Container;
diff --git a/src/CustomMutator/templates/__Name__.php b/src/CustomMutator/templates/__Name__.php
index 412ca2baf8..2b6ff49f31 100644
--- a/src/CustomMutator/templates/__Name__.php
+++ b/src/CustomMutator/templates/__Name__.php
@@ -1,4 +1,35 @@
 <?php
+/**
+ * This code is licensed under the BSD 3-Clause License.
+ *
+ * Copyright (c) 2017, Maks Rafalko
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * * Neither the name of the copyright holder nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 
 declare(strict_types=1);
 
diff --git a/src/CustomMutator/templates/__Name__Test.php b/src/CustomMutator/templates/__Name__Test.php
index abad38c707..01adbfaef3 100644
--- a/src/CustomMutator/templates/__Name__Test.php
+++ b/src/CustomMutator/templates/__Name__Test.php
@@ -1,22 +1,48 @@
 <?php
+/**
+ * This code is licensed under the BSD 3-Clause License.
+ *
+ * Copyright (c) 2017, Maks Rafalko
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * * Neither the name of the copyright holder nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 
 declare(strict_types=1);
 
 namespace App\Tests\Mutator;
 
+use App\Mutator\__Name__;
 use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
-use App\Mutator\__Name__;
 
 #[CoversClass(__Name__::class)]
 final class __Name__Test extends BaseMutatorTestCase
 {
-    protected function getTestedMutatorClassName(): string
-    {
-        return __Name__::class;
-    }
-
     /**
      * @param string|string[] $expected
      */
@@ -47,34 +73,39 @@ public static function mutationsProvider(): iterable
             ,
         ];
 
-//        yield 'It does not mutate other cases' => [
-//            <<<'PHP'
-//                <?php
-//
-//                $a = 10 * 3;
-//                PHP
-//            ,
-//        ];
+        //        yield 'It does not mutate other cases' => [
+        //            <<<'PHP'
+        //                <?php
+        //
+        //                $a = 10 * 3;
+        //                PHP
+        //            ,
+        //        ];
+
+        //        yield 'It produces N mutations' => [
+        //            <<<'PHP'
+        //                <?php
+        //
+        //                $a = 10 - 3;
+        //                PHP
+        //            ,
+        //            [
+        //                <<<'PHP'
+        //                <?php
+        //
+        //                $a = 10 - 3;
+        //                PHP,
+        //                <<<'PHP'
+        //                <?php
+        //
+        //                $a = 10 - -3;
+        //                PHP
+        //            ]
+        //        ];
+    }
 
-//        yield 'It produces N mutations' => [
-//            <<<'PHP'
-//                <?php
-//
-//                $a = 10 - 3;
-//                PHP
-//            ,
-//            [
-//                <<<'PHP'
-//                <?php
-//
-//                $a = 10 - 3;
-//                PHP,
-//                <<<'PHP'
-//                <?php
-//
-//                $a = 10 - -3;
-//                PHP
-//            ]
-//        ];
+    protected function getTestedMutatorClassName(): string
+    {
+        return __Name__::class;
     }
 }
diff --git a/src/Testing/BaseMutatorTestCase.php b/src/Testing/BaseMutatorTestCase.php
index 962945014a..0df996d3aa 100644
--- a/src/Testing/BaseMutatorTestCase.php
+++ b/src/Testing/BaseMutatorTestCase.php
@@ -35,23 +35,23 @@
 
 namespace Infection\Testing;
 
+use function array_flip;
+use function array_key_exists;
+use function array_shift;
+use function count;
+use function escapeshellarg;
+use function implode;
 use Infection\Mutator\Mutator;
 use Infection\Mutator\ProfileList;
 use Infection\PhpParser\NodeTraverserFactory;
 use Infection\PhpParser\Visitor\CloneVisitor;
 use Infection\PhpParser\Visitor\MutatorVisitor;
+use const PHP_EOL;
 use PhpParser\NodeTraverser;
 use PHPUnit\Framework\TestCase;
-use Webmozart\Assert\Assert;
-use function array_flip;
-use function array_key_exists;
-use function array_shift;
-use function count;
-use function escapeshellarg;
-use function implode;
 use function Safe\exec;
 use function sprintf;
-use const PHP_EOL;
+use Webmozart\Assert\Assert;
 
 abstract class BaseMutatorTestCase extends TestCase
 {
diff --git a/src/Testing/MutatorName.php b/src/Testing/MutatorName.php
index da70e9517d..f9ad858538 100644
--- a/src/Testing/MutatorName.php
+++ b/src/Testing/MutatorName.php
@@ -35,11 +35,14 @@
 
 namespace Infection\Testing;
 
+use function array_flip;
 use Infection\CannotBeInstantiated;
 use Infection\Mutator\ProfileList;
 use Webmozart\Assert\Assert;
-use function array_flip;
 
+/**
+ * @internal
+ */
 final class MutatorName
 {
     use CannotBeInstantiated;
diff --git a/src/Testing/SimpleMutation.php b/src/Testing/SimpleMutation.php
index 0aac9c95f2..bf53f77994 100644
--- a/src/Testing/SimpleMutation.php
+++ b/src/Testing/SimpleMutation.php
@@ -1,4 +1,35 @@
 <?php
+/**
+ * This code is licensed under the BSD 3-Clause License.
+ *
+ * Copyright (c) 2017, Maks Rafalko
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * * Neither the name of the copyright holder nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 
 declare(strict_types=1);
 
@@ -9,7 +40,10 @@
 use Infection\PhpParser\MutatedNode;
 use PhpParser\Node;
 
-class SimpleMutation extends Mutation
+/**
+ * @internal
+ */
+final class SimpleMutation extends Mutation
 {
     /**
      * @param MutatedNode $mutatedNode
@@ -22,9 +56,8 @@ public function __construct(
         private readonly Mutator $mutator,
         private $mutatedNode,
         private readonly array $attributes,
-        private readonly string $mutatedNodeClass
-    )
-    {
+        private readonly string $mutatedNodeClass,
+    ) {
     }
 
     public function getMutator(): Mutator
diff --git a/src/Testing/SimpleMutationsCollectorVisitor.php b/src/Testing/SimpleMutationsCollectorVisitor.php
index 08f5d52c1d..f48e84294b 100644
--- a/src/Testing/SimpleMutationsCollectorVisitor.php
+++ b/src/Testing/SimpleMutationsCollectorVisitor.php
@@ -1,4 +1,35 @@
 <?php
+/**
+ * This code is licensed under the BSD 3-Clause License.
+ *
+ * Copyright (c) 2017, Maks Rafalko
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * * Neither the name of the copyright holder nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
 
 declare(strict_types=1);
 
@@ -27,15 +58,14 @@ public function __construct(
         /**
          * @var Node[]
          */
-        private readonly array $fileAst
-    )
-    {
+        private readonly array $fileAst,
+    ) {
     }
 
     public function leaveNode(Node $node)
     {
         if (!$this->mutator->canMutate($node)) {
-            return;
+            return null;
         }
 
         // It is important to not rely on the keys here. It might otherwise result in some elements
@@ -46,9 +76,11 @@ public function leaveNode(Node $node)
                 $this->mutator,
                 MutatedNode::wrap($mutatedNode),
                 $node->getAttributes(),
-                $node::class
+                $node::class,
             );
         }
+
+        return null;
     }
 
     /**
diff --git a/src/Testing/SingletonContainer.php b/src/Testing/SingletonContainer.php
index 45772a59fc..45c5fd241f 100644
--- a/src/Testing/SingletonContainer.php
+++ b/src/Testing/SingletonContainer.php
@@ -45,6 +45,8 @@
  * Singleton for the container and a few services (used for tests). The goal is to avoid
  * instantiating multiple times stateless services across the tests to reduce the memory footprint
  * and remove some redundant code.
+ *
+ * @internal
  */
 final class SingletonContainer
 {
diff --git a/src/Testing/SourceTestClassNameScheme.php b/src/Testing/SourceTestClassNameScheme.php
index d58bb25e9f..605dbc7f70 100644
--- a/src/Testing/SourceTestClassNameScheme.php
+++ b/src/Testing/SourceTestClassNameScheme.php
@@ -41,6 +41,9 @@
 use function str_contains;
 use function str_replace;
 
+/**
+ * @internal
+ */
 final class SourceTestClassNameScheme
 {
     use CannotBeInstantiated;
diff --git a/src/Testing/StringNormalizer.php b/src/Testing/StringNormalizer.php
index 954f1cbf50..2ce4c385b5 100644
--- a/src/Testing/StringNormalizer.php
+++ b/src/Testing/StringNormalizer.php
@@ -35,11 +35,14 @@
 
 namespace Infection\Testing;
 
-use Infection\CannotBeInstantiated;
 use function array_map;
 use function explode;
 use function implode;
+use Infection\CannotBeInstantiated;
 
+/**
+ * @internal
+ */
 final class StringNormalizer
 {
     use CannotBeInstantiated;
diff --git a/tests/phpunit/AutoReview/ContainerTest.php b/tests/phpunit/AutoReview/ContainerTest.php
index 617f496261..39161dd3ad 100644
--- a/tests/phpunit/AutoReview/ContainerTest.php
+++ b/tests/phpunit/AutoReview/ContainerTest.php
@@ -35,18 +35,18 @@
 
 namespace Infection\Tests\AutoReview;
 
+use function array_map;
+use function in_array;
 use Infection\Testing\SingletonContainer;
 use Infection\Tests\AutoReview\ProjectCode\ProjectCodeProvider;
 use PHPUnit\Framework\Attributes\CoversNothing;
 use PHPUnit\Framework\Attributes\DataProviderExternal;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
-use Symfony\Component\Filesystem\Path;
-use function array_map;
-use function in_array;
 use function Safe\file_get_contents;
 use function sprintf;
 use function strpos;
+use Symfony\Component\Filesystem\Path;
 
 #[CoversNothing]
 final class ContainerTest extends TestCase
diff --git a/tests/phpunit/AutoReview/EnvVariableManipulation/EnvTestCasesProvider.php b/tests/phpunit/AutoReview/EnvVariableManipulation/EnvTestCasesProvider.php
index f4703a7835..f6146b96d0 100644
--- a/tests/phpunit/AutoReview/EnvVariableManipulation/EnvTestCasesProvider.php
+++ b/tests/phpunit/AutoReview/EnvVariableManipulation/EnvTestCasesProvider.php
@@ -35,18 +35,18 @@
 
 namespace Infection\Tests\AutoReview\EnvVariableManipulation;
 
-use Infection\CannotBeInstantiated;
-use Infection\Testing\SourceTestClassNameScheme;
-use Infection\Tests\AutoReview\ProjectCode\ProjectCodeProvider;
-use PHPUnit\Framework\TestCase;
-use ReflectionClass;
-use Webmozart\Assert\Assert;
 use function array_filter;
 use function array_map;
 use function array_values;
 use function class_exists;
+use Infection\CannotBeInstantiated;
+use Infection\Testing\SourceTestClassNameScheme;
+use Infection\Tests\AutoReview\ProjectCode\ProjectCodeProvider;
 use function iterator_to_array;
+use PHPUnit\Framework\TestCase;
+use ReflectionClass;
 use function Safe\file_get_contents;
+use Webmozart\Assert\Assert;
 
 final class EnvTestCasesProvider
 {
diff --git a/tests/phpunit/AutoReview/IntegrationGroup/IntegrationGroupProvider.php b/tests/phpunit/AutoReview/IntegrationGroup/IntegrationGroupProvider.php
index 3d8ef7520b..aaa0e8cc9f 100644
--- a/tests/phpunit/AutoReview/IntegrationGroup/IntegrationGroupProvider.php
+++ b/tests/phpunit/AutoReview/IntegrationGroup/IntegrationGroupProvider.php
@@ -35,20 +35,20 @@
 
 namespace Infection\Tests\AutoReview\IntegrationGroup;
 
+use function array_filter;
+use function array_map;
+use function array_values;
+use function class_exists;
 use Infection\CannotBeInstantiated;
 use Infection\Testing\SourceTestClassNameScheme;
 use Infection\Tests\AutoReview\ProjectCode\ProjectCodeProvider;
 use Infection\Tests\Console\E2ETest;
 use Infection\Tests\FileSystem\FileSystemTestCase;
+use function iterator_to_array;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
-use Webmozart\Assert\Assert;
-use function array_filter;
-use function array_map;
-use function array_values;
-use function class_exists;
-use function iterator_to_array;
 use function Safe\file_get_contents;
+use Webmozart\Assert\Assert;
 
 final class IntegrationGroupProvider
 {
diff --git a/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php b/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php
index b3f56f59fe..9b4b5cc2aa 100644
--- a/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php
+++ b/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php
@@ -41,6 +41,7 @@
 use function in_array;
 use Infection\CannotBeInstantiated;
 use Infection\Command\ConfigureCommand;
+use Infection\Command\CustomMutatorCommand;
 use Infection\Config\ConsoleHelper;
 use Infection\Config\Guesser\SourceDirGuesser;
 use Infection\Configuration\Schema\SchemaConfigurationFactory;
@@ -79,6 +80,13 @@
 use Infection\TestFramework\MapSourceClassToTestStrategy;
 use Infection\TestFramework\PhpUnit\Config\Builder\InitialConfigBuilder as PhpUnitInitalConfigBuilder;
 use Infection\TestFramework\PhpUnit\Config\Builder\MutationConfigBuilder as PhpUnitMutationConfigBuilder;
+use Infection\Testing\BaseMutatorTestCase;
+use Infection\Testing\MutatorName;
+use Infection\Testing\SimpleMutation;
+use Infection\Testing\SimpleMutationsCollectorVisitor;
+use Infection\Testing\SingletonContainer;
+use Infection\Testing\SourceTestClassNameScheme;
+use Infection\Testing\StringNormalizer;
 use Infection\Tests\AutoReview\ConcreteClassReflector;
 use function Infection\Tests\generator_to_phpunit_data_provider;
 use function iterator_to_array;
@@ -120,6 +128,14 @@ final class ProjectCodeProvider
         DispatchPcntlSignalSubscriber::class,
         StopInfectionOnSigintSignalSubscriber::class,
         MapSourceClassToTestStrategy::class, // no need to test 1 const for now
+        MutatorName::class,
+        BaseMutatorTestCase::class,
+        SimpleMutation::class,
+        StringNormalizer::class,
+        SourceTestClassNameScheme::class,
+        SimpleMutationsCollectorVisitor::class,
+        CustomMutatorCommand::class,
+        SingletonContainer::class,
     ];
 
     /**
@@ -147,6 +163,7 @@ final class ProjectCodeProvider
         Mutator::class,
         Definition::class,
         MutatorCategory::class,
+        BaseMutatorTestCase::class,
     ];
 
     /**
@@ -177,6 +194,8 @@ public static function provideSourceClasses(): iterable
             ->name('*.php')
             ->notName('DummySymfony5FileSystem.php')
             ->notName('DummySymfony6FileSystem.php')
+            ->notName('__Name__.php')
+            ->notName('__Name__Test.php')
             ->in(__DIR__ . '/../../../../src')
         ;
 
diff --git a/tests/phpunit/AutoReview/ProjectCode/ProjectCodeTest.php b/tests/phpunit/AutoReview/ProjectCode/ProjectCodeTest.php
index 36449e25fd..93af8c3697 100644
--- a/tests/phpunit/AutoReview/ProjectCode/ProjectCodeTest.php
+++ b/tests/phpunit/AutoReview/ProjectCode/ProjectCodeTest.php
@@ -35,21 +35,21 @@
 
 namespace Infection\Tests\AutoReview\ProjectCode;
 
+use function array_filter;
+use function array_flip;
+use function array_key_exists;
+use function array_map;
+use function class_exists;
+use function in_array;
 use Infection\StreamWrapper\IncludeInterceptor;
 use Infection\Testing\SingletonContainer;
 use Infection\Testing\SourceTestClassNameScheme;
+use function is_executable;
 use PHPUnit\Framework\Attributes\CoversNothing;
 use PHPUnit\Framework\Attributes\DataProviderExternal;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
 use ReflectionProperty;
-use function array_filter;
-use function array_flip;
-use function array_key_exists;
-use function array_map;
-use function class_exists;
-use function in_array;
-use function is_executable;
 use function sprintf;
 
 /**
diff --git a/tests/phpunit/Configuration/ConfigurationFactoryTest.php b/tests/phpunit/Configuration/ConfigurationFactoryTest.php
index c422d9b159..929a70e741 100644
--- a/tests/phpunit/Configuration/ConfigurationFactoryTest.php
+++ b/tests/phpunit/Configuration/ConfigurationFactoryTest.php
@@ -57,6 +57,7 @@
 use Infection\TestFramework\MapSourceClassToTestStrategy;
 use Infection\Testing\SingletonContainer;
 use Infection\Tests\Fixtures\DummyCiDetector;
+use function Infection\Tests\normalizePath;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
@@ -64,7 +65,6 @@
 use Prophecy\PhpUnit\ProphecyTrait;
 use Prophecy\Prophecy\ObjectProphecy;
 use Symfony\Component\Finder\SplFileInfo;
-use function Infection\Tests\normalizePath;
 use function sys_get_temp_dir;
 
 #[Group('integration')]
diff --git a/tests/phpunit/Console/E2ETest.php b/tests/phpunit/Console/E2ETest.php
index 7c9b4239ae..b48f97e4c0 100644
--- a/tests/phpunit/Console/E2ETest.php
+++ b/tests/phpunit/Console/E2ETest.php
@@ -35,32 +35,31 @@
 
 namespace Infection\Tests\Console;
 
+use function array_merge;
+use function basename;
 use Composer\Autoload\ClassLoader;
+use const DIRECTORY_SEPARATOR;
+use function extension_loaded;
+use function file_exists;
+use function function_exists;
+use function getenv;
+use function implode;
 use Infection\Command\ConfigureCommand;
 use Infection\Console\Application;
 use Infection\Console\E2E;
 use Infection\FileSystem\Finder\ComposerExecutableFinder;
 use Infection\FileSystem\Finder\Exception\FinderException;
 use Infection\Testing\SingletonContainer;
+use function is_readable;
+use const PHP_EOL;
+use const PHP_OS;
+use const PHP_SAPI;
 use PHPUnit\Framework\Attributes\CoversNothing;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\Attributes\Large;
 use PHPUnit\Framework\Attributes\RunInSeparateProcess;
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Console\Input\ArgvInput;
-use Symfony\Component\Console\Output\BufferedOutput;
-use Symfony\Component\Finder\Finder;
-use Symfony\Component\Process\Exception\ProcessTimedOutException;
-use Symfony\Component\Process\Process;
-use function array_merge;
-use function basename;
-use function extension_loaded;
-use function file_exists;
-use function function_exists;
-use function getenv;
-use function implode;
-use function is_readable;
 use function Safe\chdir;
 use function Safe\copy;
 use function Safe\file_get_contents;
@@ -70,10 +69,11 @@
 use function str_contains;
 use function str_replace;
 use function str_starts_with;
-use const DIRECTORY_SEPARATOR;
-use const PHP_EOL;
-use const PHP_OS;
-use const PHP_SAPI;
+use Symfony\Component\Console\Input\ArgvInput;
+use Symfony\Component\Console\Output\BufferedOutput;
+use Symfony\Component\Finder\Finder;
+use Symfony\Component\Process\Exception\ProcessTimedOutException;
+use Symfony\Component\Process\Process;
 
 #[Group('e2e')]
 #[Group('integration')]
diff --git a/tests/phpunit/Logger/Html/StrykerHtmlReportBuilderTest.php b/tests/phpunit/Logger/Html/StrykerHtmlReportBuilderTest.php
index 0648d65e38..fd926d8476 100644
--- a/tests/phpunit/Logger/Html/StrykerHtmlReportBuilderTest.php
+++ b/tests/phpunit/Logger/Html/StrykerHtmlReportBuilderTest.php
@@ -35,6 +35,8 @@
 
 namespace Infection\Tests\Logger\Html;
 
+use function array_map;
+use function implode;
 use Infection\AbstractTestFramework\Coverage\TestLocation;
 use Infection\Logger\Html\StrykerHtmlReportBuilder;
 use Infection\Metrics\Collector;
@@ -46,22 +48,20 @@
 use Infection\Mutator\Removal\ArrayItemRemoval;
 use Infection\Mutator\Removal\MethodCallRemoval;
 use Infection\Testing\MutatorName;
+use function Infection\Tests\normalize_trailing_spaces;
 use JsonSchema\Validator;
+use function Later\now;
+use const PHP_EOL;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\TestCase;
-use function array_map;
-use function implode;
-use function Infection\Tests\normalize_trailing_spaces;
-use function Later\now;
 use function Safe\base64_decode;
 use function Safe\file_get_contents;
 use function Safe\json_decode;
 use function Safe\json_encode;
 use function Safe\realpath;
 use function sprintf;
-use const PHP_EOL;
 
 #[Group('integration')]
 #[CoversClass(StrykerHtmlReportBuilder::class)]
diff --git a/tests/phpunit/Metrics/CreateMutantExecutionResult.php b/tests/phpunit/Metrics/CreateMutantExecutionResult.php
index 8300e266a2..db128e259f 100644
--- a/tests/phpunit/Metrics/CreateMutantExecutionResult.php
+++ b/tests/phpunit/Metrics/CreateMutantExecutionResult.php
@@ -40,8 +40,8 @@
 use Infection\Mutator\Loop\For_;
 use Infection\Testing\MutatorName;
 use function Later\now;
-use function str_replace;
 use const PHP_EOL;
+use function str_replace;
 
 trait CreateMutantExecutionResult
 {
diff --git a/tests/phpunit/Metrics/SortableMutantExecutionResultsTest.php b/tests/phpunit/Metrics/SortableMutantExecutionResultsTest.php
index 8b607cd6fd..eef2d66e21 100644
--- a/tests/phpunit/Metrics/SortableMutantExecutionResultsTest.php
+++ b/tests/phpunit/Metrics/SortableMutantExecutionResultsTest.php
@@ -40,10 +40,10 @@
 use Infection\Mutant\MutantExecutionResult;
 use Infection\Mutator\Loop\For_;
 use Infection\Testing\MutatorName;
+use function Later\now;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
-use function Later\now;
 
 #[CoversClass(SortableMutantExecutionResults::class)]
 final class SortableMutantExecutionResultsTest extends TestCase
diff --git a/tests/phpunit/Mutant/MutantExecutionResultTest.php b/tests/phpunit/Mutant/MutantExecutionResultTest.php
index d1ea5194d0..cb78833120 100644
--- a/tests/phpunit/Mutant/MutantExecutionResultTest.php
+++ b/tests/phpunit/Mutant/MutantExecutionResultTest.php
@@ -42,10 +42,10 @@
 use Infection\Mutator\Loop\For_;
 use Infection\PhpParser\MutatedNode;
 use Infection\Testing\MutatorName;
+use function Later\now;
 use PhpParser\Node\Stmt\Nop;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
-use function Later\now;
 
 #[CoversClass(MutantExecutionResult::class)]
 final class MutantExecutionResultTest extends TestCase
diff --git a/tests/phpunit/Mutant/MutantTest.php b/tests/phpunit/Mutant/MutantTest.php
index e12824e377..00fd1f5a40 100644
--- a/tests/phpunit/Mutant/MutantTest.php
+++ b/tests/phpunit/Mutant/MutantTest.php
@@ -41,11 +41,11 @@
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\PhpParser\MutatedNode;
 use Infection\Testing\MutatorName;
+use function Later\now;
 use PhpParser\Node;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
-use function Later\now;
 
 #[CoversClass(Mutant::class)]
 final class MutantTest extends TestCase
diff --git a/tests/phpunit/Mutation/FileMutationGeneratorTest.php b/tests/phpunit/Mutation/FileMutationGeneratorTest.php
index 51cd0ef459..41f7e6855b 100644
--- a/tests/phpunit/Mutation/FileMutationGeneratorTest.php
+++ b/tests/phpunit/Mutation/FileMutationGeneratorTest.php
@@ -35,6 +35,7 @@
 
 namespace Infection\Tests\Mutation;
 
+use function current;
 use Infection\Differ\FilesDiffChangedLines;
 use Infection\Mutation\FileMutationGenerator;
 use Infection\Mutation\Mutation;
@@ -50,15 +51,14 @@
 use Infection\Testing\SingletonContainer;
 use Infection\Tests\Fixtures\PhpParser\FakeIgnorer;
 use Infection\Tests\Fixtures\PhpParser\FakeNode;
+use function iterator_to_array;
 use PhpParser\NodeTraverserInterface;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Finder\SplFileInfo;
-use function current;
-use function iterator_to_array;
 use function sprintf;
+use Symfony\Component\Finder\SplFileInfo;
 
 #[CoversClass(FileMutationGenerator::class)]
 final class FileMutationGeneratorTest extends TestCase
diff --git a/tests/phpunit/Mutation/MutationTest.php b/tests/phpunit/Mutation/MutationTest.php
index 470e23b325..22aa1b9907 100644
--- a/tests/phpunit/Mutation/MutationTest.php
+++ b/tests/phpunit/Mutation/MutationTest.php
@@ -35,17 +35,17 @@
 
 namespace Infection\Tests\Mutation;
 
+use function array_merge;
 use Infection\AbstractTestFramework\Coverage\TestLocation;
 use Infection\Mutation\Mutation;
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\PhpParser\MutatedNode;
 use Infection\Testing\MutatorName;
+use function md5;
 use PhpParser\Node;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
-use function array_merge;
-use function md5;
 
 #[CoversClass(Mutation::class)]
 final class MutationTest extends TestCase
diff --git a/tests/phpunit/Mutator/DefinitionTest.php b/tests/phpunit/Mutator/DefinitionTest.php
index 6d2d97f117..e1657a7e22 100644
--- a/tests/phpunit/Mutator/DefinitionTest.php
+++ b/tests/phpunit/Mutator/DefinitionTest.php
@@ -35,6 +35,9 @@
 
 namespace Infection\Tests\Mutator;
 
+use function array_diff_key;
+use function array_fill_keys;
+use function array_flip;
 use Infection\Mutator\Definition;
 use Infection\Mutator\Mutator;
 use Infection\Mutator\MutatorCategory;
@@ -43,9 +46,6 @@
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
-use function array_diff_key;
-use function array_fill_keys;
-use function array_flip;
 use function sprintf;
 
 #[CoversClass(Definition::class)]
diff --git a/tests/phpunit/Mutator/Extensions/BCMathTest.php b/tests/phpunit/Mutator/Extensions/BCMathTest.php
index edbf86e7b7..47389eb49b 100644
--- a/tests/phpunit/Mutator/Extensions/BCMathTest.php
+++ b/tests/phpunit/Mutator/Extensions/BCMathTest.php
@@ -35,12 +35,12 @@
 
 namespace Infection\Tests\Mutator\Extensions;
 
+use function array_map;
+use function implode;
 use Infection\Mutator\Extensions\BCMath;
 use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
-use function array_map;
-use function implode;
 use function range;
 use function strtoupper;
 use function ucfirst;
diff --git a/tests/phpunit/Mutator/Extensions/MBStringTest.php b/tests/phpunit/Mutator/Extensions/MBStringTest.php
index 408a616841..a18fd26210 100644
--- a/tests/phpunit/Mutator/Extensions/MBStringTest.php
+++ b/tests/phpunit/Mutator/Extensions/MBStringTest.php
@@ -35,11 +35,11 @@
 
 namespace Infection\Tests\Mutator\Extensions;
 
+use function defined;
 use Infection\Mutator\Extensions\MBString;
 use Infection\Testing\BaseMutatorTestCase;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
-use function defined;
 use function Safe\define;
 
 #[CoversClass(MBString::class)]
diff --git a/tests/phpunit/Mutator/IgnoreMutatorTest.php b/tests/phpunit/Mutator/IgnoreMutatorTest.php
index 11d56df1b0..e2dcfb4cf7 100644
--- a/tests/phpunit/Mutator/IgnoreMutatorTest.php
+++ b/tests/phpunit/Mutator/IgnoreMutatorTest.php
@@ -44,11 +44,11 @@
 use Infection\Reflection\CoreClassReflection;
 use Infection\Testing\MutatorName;
 use Infection\Tests\WithConsecutive;
+use function iterator_to_array;
 use PhpParser\Node;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
-use function iterator_to_array;
 
 #[CoversClass(IgnoreMutator::class)]
 final class IgnoreMutatorTest extends TestCase
diff --git a/tests/phpunit/Mutator/MutatorFactoryTest.php b/tests/phpunit/Mutator/MutatorFactoryTest.php
index 6961b7dfcd..736740bf15 100644
--- a/tests/phpunit/Mutator/MutatorFactoryTest.php
+++ b/tests/phpunit/Mutator/MutatorFactoryTest.php
@@ -35,6 +35,9 @@
 
 namespace Infection\Tests\Mutator;
 
+use function array_fill_keys;
+use function array_values;
+use function count;
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\Mutator\Boolean\TrueValue;
 use Infection\Mutator\IgnoreMutator;
@@ -52,11 +55,8 @@
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
-use stdClass;
-use function array_fill_keys;
-use function array_values;
-use function count;
 use function sprintf;
+use stdClass;
 
 #[CoversClass(MutatorFactory::class)]
 final class MutatorFactoryTest extends TestCase
diff --git a/tests/phpunit/Mutator/MutatorFixturesProvider.php b/tests/phpunit/Mutator/MutatorFixturesProvider.php
index 6d99a5cb70..eebda8cfd9 100644
--- a/tests/phpunit/Mutator/MutatorFixturesProvider.php
+++ b/tests/phpunit/Mutator/MutatorFixturesProvider.php
@@ -35,16 +35,16 @@
 
 namespace Infection\Tests\Mutator;
 
-use Infection\CannotBeInstantiated;
-use Infection\Testing\BaseMutatorTestCase;
-use Symfony\Component\Filesystem\Path;
-use Webmozart\Assert\Assert;
 use function array_key_exists;
 use function end;
 use function explode;
+use Infection\CannotBeInstantiated;
+use Infection\Testing\BaseMutatorTestCase;
 use function Safe\file_get_contents;
 use function sprintf;
 use function substr;
+use Symfony\Component\Filesystem\Path;
+use Webmozart\Assert\Assert;
 
 final class MutatorFixturesProvider
 {
diff --git a/tests/phpunit/Mutator/MutatorResolverTest.php b/tests/phpunit/Mutator/MutatorResolverTest.php
index 3dd9ee4775..20c2cb573a 100644
--- a/tests/phpunit/Mutator/MutatorResolverTest.php
+++ b/tests/phpunit/Mutator/MutatorResolverTest.php
@@ -35,6 +35,9 @@
 
 namespace Infection\Tests\Mutator;
 
+use function array_diff;
+use function array_values;
+use function count;
 use Infection\Mutator\Arithmetic\Minus;
 use Infection\Mutator\Arithmetic\Plus;
 use Infection\Mutator\Boolean\IdenticalEqual;
@@ -52,9 +55,6 @@
 use InvalidArgumentException;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
-use function array_diff;
-use function array_values;
-use function count;
 use function sprintf;
 
 #[CoversClass(MutatorResolver::class)]
diff --git a/tests/phpunit/Mutator/MutatorRobustnessTest.php b/tests/phpunit/Mutator/MutatorRobustnessTest.php
index 913588fea5..eeeb3e5f99 100644
--- a/tests/phpunit/Mutator/MutatorRobustnessTest.php
+++ b/tests/phpunit/Mutator/MutatorRobustnessTest.php
@@ -35,22 +35,22 @@
 
 namespace Infection\Tests\Mutator;
 
+use function array_values;
 use Infection\Mutator\Mutator;
 use Infection\Mutator\ProfileList;
 use Infection\PhpParser\NodeTraverserFactory;
 use Infection\Testing\MutatorName;
 use Infection\Testing\SingletonContainer;
 use Infection\Tests\Fixtures\NullMutationVisitor;
+use function ksort;
 use PHPUnit\Framework\Attributes\CoversNothing;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
+use const SORT_STRING;
+use function sprintf;
 use Symfony\Component\Finder\Finder;
 use Symfony\Component\Finder\SplFileInfo;
 use Throwable;
-use function array_values;
-use function ksort;
-use function sprintf;
-use const SORT_STRING;
 
 #[CoversNothing]
 final class MutatorRobustnessTest extends TestCase
diff --git a/tests/phpunit/Mutator/NoopMutatorTest.php b/tests/phpunit/Mutator/NoopMutatorTest.php
index 3d1c675784..1b291ca89f 100644
--- a/tests/phpunit/Mutator/NoopMutatorTest.php
+++ b/tests/phpunit/Mutator/NoopMutatorTest.php
@@ -40,11 +40,11 @@
 use Infection\Mutator\Mutator;
 use Infection\Mutator\NoopMutator;
 use Infection\Testing\MutatorName;
+use function iterator_to_array;
 use PhpParser\Node;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
-use function iterator_to_array;
 
 #[CoversClass(NoopMutator::class)]
 final class NoopMutatorTest extends TestCase
diff --git a/tests/phpunit/Mutator/Number/DecrementIntegerTest.php b/tests/phpunit/Mutator/Number/DecrementIntegerTest.php
index c64d54379f..f83f455447 100644
--- a/tests/phpunit/Mutator/Number/DecrementIntegerTest.php
+++ b/tests/phpunit/Mutator/Number/DecrementIntegerTest.php
@@ -37,10 +37,10 @@
 
 use Infection\Mutator\Number\DecrementInteger;
 use Infection\Testing\BaseMutatorTestCase;
-use PHPUnit\Framework\Attributes\CoversClass;
-use PHPUnit\Framework\Attributes\DataProvider;
 use const PHP_INT_MAX;
 use const PHP_INT_MIN;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 #[CoversClass(DecrementInteger::class)]
 final class DecrementIntegerTest extends BaseMutatorTestCase
diff --git a/tests/phpunit/Mutator/Number/IncrementIntegerTest.php b/tests/phpunit/Mutator/Number/IncrementIntegerTest.php
index 85cdeae644..a64709bf04 100644
--- a/tests/phpunit/Mutator/Number/IncrementIntegerTest.php
+++ b/tests/phpunit/Mutator/Number/IncrementIntegerTest.php
@@ -37,10 +37,10 @@
 
 use Infection\Mutator\Number\IncrementInteger;
 use Infection\Testing\BaseMutatorTestCase;
-use PHPUnit\Framework\Attributes\CoversClass;
-use PHPUnit\Framework\Attributes\DataProvider;
 use const PHP_INT_MAX;
 use const PHP_INT_MIN;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\DataProvider;
 
 #[CoversClass(IncrementInteger::class)]
 final class IncrementIntegerTest extends BaseMutatorTestCase
diff --git a/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php b/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php
index bf06d58575..e265c7e96e 100644
--- a/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php
+++ b/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php
@@ -37,9 +37,9 @@
 
 use Infection\Mutator\Operator\NullSafeMethodCall;
 use Infection\Testing\BaseMutatorTestCase;
+use const PHP_VERSION_ID;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
-use const PHP_VERSION_ID;
 
 #[CoversClass(NullSafeMethodCall::class)]
 final class NullSafeMethodCallTest extends BaseMutatorTestCase
diff --git a/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php b/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php
index ab65e5fbda..ac76cd0db7 100644
--- a/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php
+++ b/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php
@@ -37,9 +37,9 @@
 
 use Infection\Mutator\Operator\NullSafePropertyCall;
 use Infection\Testing\BaseMutatorTestCase;
+use const PHP_VERSION_ID;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
-use const PHP_VERSION_ID;
 
 #[CoversClass(NullSafePropertyCall::class)]
 final class NullSafePropertyCallTest extends BaseMutatorTestCase
diff --git a/tests/phpunit/Mutator/Operator/TernaryTest.php b/tests/phpunit/Mutator/Operator/TernaryTest.php
index f85f10c4eb..d86d532646 100644
--- a/tests/phpunit/Mutator/Operator/TernaryTest.php
+++ b/tests/phpunit/Mutator/Operator/TernaryTest.php
@@ -37,9 +37,9 @@
 
 use Infection\Mutator\Operator\Ternary;
 use Infection\Testing\BaseMutatorTestCase;
+use const PHP_VERSION_ID;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
-use const PHP_VERSION_ID;
 
 #[CoversClass(Ternary::class)]
 final class TernaryTest extends BaseMutatorTestCase
diff --git a/tests/phpunit/Mutator/ProfileListTest.php b/tests/phpunit/Mutator/ProfileListTest.php
index 450361510a..83efdd8daf 100644
--- a/tests/phpunit/Mutator/ProfileListTest.php
+++ b/tests/phpunit/Mutator/ProfileListTest.php
@@ -35,16 +35,16 @@
 
 namespace Infection\Tests\Mutator;
 
+use function array_keys;
+use function in_array;
 use Infection\Mutator\ProfileList;
 use Infection\Testing\MutatorName;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProviderExternal;
 use PHPUnit\Framework\TestCase;
-use function array_keys;
-use function in_array;
 use function Safe\sort;
-use function sprintf;
 use const SORT_STRING;
+use function sprintf;
 
 #[CoversClass(ProfileList::class)]
 final class ProfileListTest extends TestCase
diff --git a/tests/phpunit/Mutator/ReturnValue/ThisTest.php b/tests/phpunit/Mutator/ReturnValue/ThisTest.php
index 0aaae1189a..602c2b7594 100644
--- a/tests/phpunit/Mutator/ReturnValue/ThisTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/ThisTest.php
@@ -35,12 +35,12 @@
 
 namespace Infection\Tests\Mutator\ReturnValue;
 
+use Infection\Mutator\ReturnValue\This;
 use Infection\Testing\BaseMutatorTestCase;
 use Infection\Tests\Mutator\MutatorFixturesProvider;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
-use This;
 
 #[Group('integration')]
 #[CoversClass(This::class)]
diff --git a/tests/phpunit/PhpParser/FileParserTest.php b/tests/phpunit/PhpParser/FileParserTest.php
index ee53e58275..909228633f 100644
--- a/tests/phpunit/PhpParser/FileParserTest.php
+++ b/tests/phpunit/PhpParser/FileParserTest.php
@@ -46,9 +46,9 @@
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Group;
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Finder\SplFileInfo;
 use function Safe\realpath;
 use function sprintf;
+use Symfony\Component\Finder\SplFileInfo;
 
 #[Group('integration')]
 #[CoversClass(FileParser::class)]
diff --git a/tests/phpunit/Process/Factory/MutantProcessFactoryTest.php b/tests/phpunit/Process/Factory/MutantProcessFactoryTest.php
index 7616ccbfbb..d5a3edce33 100644
--- a/tests/phpunit/Process/Factory/MutantProcessFactoryTest.php
+++ b/tests/phpunit/Process/Factory/MutantProcessFactoryTest.php
@@ -35,6 +35,7 @@
 
 namespace Infection\Tests\Process\Factory;
 
+use function current;
 use Infection\AbstractTestFramework\Coverage\TestLocation;
 use Infection\AbstractTestFramework\TestFrameworkAdapter;
 use Infection\Event\MutantProcessWasFinished;
@@ -47,11 +48,10 @@
 use Infection\Testing\MutatorName;
 use Infection\Tests\Fixtures\Event\EventDispatcherCollector;
 use Infection\Tests\Mutant\MutantBuilder;
+use const PHP_OS_FAMILY;
 use PhpParser\Node\Stmt\Nop;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
-use function current;
-use const PHP_OS_FAMILY;
 
 #[CoversClass(MutantProcessFactory::class)]
 final class MutantProcessFactoryTest extends TestCase
diff --git a/tests/phpunit/Process/Runner/MutationTestingRunnerTest.php b/tests/phpunit/Process/Runner/MutationTestingRunnerTest.php
index c4aaad9581..3359f20d2e 100644
--- a/tests/phpunit/Process/Runner/MutationTestingRunnerTest.php
+++ b/tests/phpunit/Process/Runner/MutationTestingRunnerTest.php
@@ -35,7 +35,10 @@
 
 namespace Infection\Tests\Process\Runner;
 
+use function array_map;
 use ArrayIterator;
+use function count;
+use function implode;
 use Infection\AbstractTestFramework\Coverage\TestLocation;
 use Infection\Differ\DiffSourceCodeMatcher;
 use Infection\Event\MutantProcessWasFinished;
@@ -60,11 +63,8 @@
 use PHPUnit\Framework\Constraint\Callback;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
-use Symfony\Component\Filesystem\Filesystem;
-use function array_map;
-use function count;
-use function implode;
 use function sprintf;
+use Symfony\Component\Filesystem\Filesystem;
 
 #[Group('integration')]
 #[CoversClass(MutationTestingRunner::class)]

From c3c5ab13cefa5292e4b0a957f012d29887805773 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Mon, 20 May 2024 21:59:08 +0200
Subject: [PATCH 05/25] Fix type

---
 src/Command/CustomMutatorCommand.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index 34ece5e66b..ff901be36e 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -56,7 +56,7 @@ protected function configure(): void
     {
         $this
             ->setName('custom-mutator')
-            ->setDescription('Creates a cusotm mutator')
+            ->setDescription('Creates a custom mutator')
             ->addArgument('Mutator name', InputArgument::OPTIONAL);
     }
 

From 0e2d370419afe0283e70d9a004418266f8fbc150 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Mon, 20 May 2024 22:04:19 +0200
Subject: [PATCH 06/25] Exclude template files from mutating

---
 infection.json5 | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/infection.json5 b/infection.json5
index 110754e09a..d72c7e96f0 100644
--- a/infection.json5
+++ b/infection.json5
@@ -8,7 +8,9 @@
         excludes: [
             "FileSystem/DummyFileSystem.php",
             "FileSystem/DummySymfony5FileSystem.php",
-            "FileSystem/DummySymfony6FileSystem.php"
+            "FileSystem/DummySymfony6FileSystem.php",
+            "CustomMutator/templates/__Name__.php",
+            "CustomMutator/templates/__Name__Test.php",
         ]
     },
     "logs": {

From 3191313812ab03f189709d1ef60836b4fe2195df Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 12:38:23 +0200
Subject: [PATCH 07/25] Rename `$mutator` to `$mutatorName`

---
 src/Command/CustomMutatorCommand.php | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index ff901be36e..9ffc5911ed 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -62,9 +62,9 @@ protected function configure(): void
 
     protected function executeCommand(IO $io): bool
     {
-        $mutator = $io->getInput()->getArgument('Mutator name');
+        $mutatorName = $io->getInput()->getArgument('Mutator name');
 
-        if ($mutator === null) {
+        if ($mutatorName === null) {
             $question = new Question('What mutator do you wish to create (e.g. `AnyStringToInfectedMutator`)?');
             $question->setValidator(static function (?string $answer): string {
                 if ($answer === null || trim($answer) === '') {
@@ -73,12 +73,12 @@ protected function executeCommand(IO $io): bool
 
                 return $answer;
             });
-            $mutator = $io->askQuestion(
+            $mutatorName = $io->askQuestion(
                 $question,
             );
         }
 
-        $mutator = ucfirst((string) $mutator);
+        $mutatorName = ucfirst((string) $mutatorName);
 
         // find all files in templates directory
         $finder = Finder::create()
@@ -94,8 +94,8 @@ protected function executeCommand(IO $io): bool
 
         foreach ($fileInfos as $fileInfo) {
             // replace __Name__ with $mutator
-            $newContent = $this->replaceNameVariable($mutator, $fileInfo->getContents());
-            $replacedNamePath = $this->replaceNameVariable($mutator, $fileInfo->getRelativePathname());
+            $newContent = $this->replaceNameVariable($mutatorName, $fileInfo->getContents());
+            $replacedNamePath = $this->replaceNameVariable($mutatorName, $fileInfo->getRelativePathname());
 
             $newFilePath = $currentDirectory . '/src/Mutator/' . $replacedNamePath;
 
@@ -107,7 +107,7 @@ protected function executeCommand(IO $io): bool
         $io->title('Generated files');
         $io->listing($generatedFilePaths);
         $io->success(
-            sprintf('Base classes for the "%s" mutator were created. Complee the missing parts inside them.', $mutator),
+            sprintf('Base classes for the "%s" mutator were created. Complee the missing parts inside them.', $mutatorName),
         );
 
         return true;

From 92d5ac680c7fc04fd1268a8ae9634ec102cbf0ca Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 12:39:13 +0200
Subject: [PATCH 08/25] Fix typo

---
 src/Command/CustomMutatorCommand.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index 9ffc5911ed..f936316e12 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -68,7 +68,7 @@ protected function executeCommand(IO $io): bool
             $question = new Question('What mutator do you wish to create (e.g. `AnyStringToInfectedMutator`)?');
             $question->setValidator(static function (?string $answer): string {
                 if ($answer === null || trim($answer) === '') {
-                    throw new RuntimeException('Mutator name is mandaory.');
+                    throw new RuntimeException('Mutator name is mandatory.');
                 }
 
                 return $answer;

From d23b6c7ce60202275507534b92cef6d3ab9172aa Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 12:40:25 +0200
Subject: [PATCH 09/25] Move asking mutator name to separate private function

---
 src/Command/CustomMutatorCommand.php | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index f936316e12..2a65579bfc 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -65,17 +65,7 @@ protected function executeCommand(IO $io): bool
         $mutatorName = $io->getInput()->getArgument('Mutator name');
 
         if ($mutatorName === null) {
-            $question = new Question('What mutator do you wish to create (e.g. `AnyStringToInfectedMutator`)?');
-            $question->setValidator(static function (?string $answer): string {
-                if ($answer === null || trim($answer) === '') {
-                    throw new RuntimeException('Mutator name is mandatory.');
-                }
-
-                return $answer;
-            });
-            $mutatorName = $io->askQuestion(
-                $question,
-            );
+            $mutatorName = $this->askMutatorName($io);
         }
 
         $mutatorName = ucfirst((string) $mutatorName);
@@ -117,4 +107,20 @@ private function replaceNameVariable(string $rectorName, string $contents): stri
     {
         return str_replace('__Name__', $rectorName, $contents);
     }
+
+    private function askMutatorName(IO $io): mixed
+    {
+        $question = new Question('What mutator do you wish to create (e.g. `AnyStringToInfectedMutator`)?');
+        $question->setValidator(static function (?string $answer): string {
+            if ($answer === null || trim($answer) === '') {
+                throw new RuntimeException('Mutator name is mandatory.');
+            }
+
+            return $answer;
+        });
+
+        return $io->askQuestion(
+            $question,
+        );
+    }
 }

From 0c63af7efffc9e114c4bfadaeef829f81678a090 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 12:56:37 +0200
Subject: [PATCH 10/25] Use hardcoded paths instead of Finder

---
 src/Command/CustomMutatorCommand.php | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index 2a65579bfc..caf20e01d1 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -35,15 +35,15 @@
 
 namespace Infection\Command;
 
+use function basename;
+use function file_get_contents;
 use Infection\Console\IO;
-use function iterator_to_array;
 use RuntimeException;
 use function Safe\getcwd;
 use function sprintf;
 use function str_replace;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Question\Question;
-use Symfony\Component\Finder\Finder;
 use function trim;
 use function ucfirst;
 
@@ -70,22 +70,20 @@ protected function executeCommand(IO $io): bool
 
         $mutatorName = ucfirst((string) $mutatorName);
 
-        // find all files in templates directory
-        $finder = Finder::create()
-            ->files()
-            ->in(__DIR__ . '/../CustomMutator/templates');
+        $filePaths = [
+            __DIR__ . '/../CustomMutator/templates/__Name__.php',
+            __DIR__ . '/../CustomMutator/templates/__Name__Test.php',
+        ];
 
         $currentDirectory = getcwd();
-
         $generatedFilePaths = [];
 
-        $fileInfos = iterator_to_array($finder->getIterator());
         $fileSystem = $this->getApplication()->getContainer()->getFileSystem();
 
-        foreach ($fileInfos as $fileInfo) {
+        foreach ($filePaths as $filePath) {
             // replace __Name__ with $mutator
-            $newContent = $this->replaceNameVariable($mutatorName, $fileInfo->getContents());
-            $replacedNamePath = $this->replaceNameVariable($mutatorName, $fileInfo->getRelativePathname());
+            $newContent = $this->replaceNameVariable($mutatorName, file_get_contents($filePath));
+            $replacedNamePath = $this->replaceNameVariable($mutatorName, basename($filePath));
 
             $newFilePath = $currentDirectory . '/src/Mutator/' . $replacedNamePath;
 

From 7dd741921a0e17a4251378d050046a0d1a8f30ab Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:01:22 +0200
Subject: [PATCH 11/25] Use static methods

---
 src/Command/CustomMutatorCommand.php | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index caf20e01d1..18f43efcad 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -81,9 +81,9 @@ protected function executeCommand(IO $io): bool
         $fileSystem = $this->getApplication()->getContainer()->getFileSystem();
 
         foreach ($filePaths as $filePath) {
-            // replace __Name__ with $mutator
-            $newContent = $this->replaceNameVariable($mutatorName, file_get_contents($filePath));
-            $replacedNamePath = $this->replaceNameVariable($mutatorName, basename($filePath));
+            // replace __Name__ with $mutatorName
+            $newContent = self::replaceNameVariable($mutatorName, file_get_contents($filePath));
+            $replacedNamePath = self::replaceNameVariable($mutatorName, basename($filePath));
 
             $newFilePath = $currentDirectory . '/src/Mutator/' . $replacedNamePath;
 
@@ -101,7 +101,7 @@ protected function executeCommand(IO $io): bool
         return true;
     }
 
-    private function replaceNameVariable(string $rectorName, string $contents): string
+    private static function replaceNameVariable(string $rectorName, string $contents): string
     {
         return str_replace('__Name__', $rectorName, $contents);
     }

From 969cd704dcd5b0abdcbbbb974a4ed7e70ca41879 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:04:43 +0200
Subject: [PATCH 12/25] Create helper method to dump templates to project to
 improve readability

---
 src/Command/CustomMutatorCommand.php | 45 +++++++++++++++++-----------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index 18f43efcad..d5060bf723 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -70,27 +70,12 @@ protected function executeCommand(IO $io): bool
 
         $mutatorName = ucfirst((string) $mutatorName);
 
-        $filePaths = [
+        $templateFilePaths = [
             __DIR__ . '/../CustomMutator/templates/__Name__.php',
             __DIR__ . '/../CustomMutator/templates/__Name__Test.php',
         ];
 
-        $currentDirectory = getcwd();
-        $generatedFilePaths = [];
-
-        $fileSystem = $this->getApplication()->getContainer()->getFileSystem();
-
-        foreach ($filePaths as $filePath) {
-            // replace __Name__ with $mutatorName
-            $newContent = self::replaceNameVariable($mutatorName, file_get_contents($filePath));
-            $replacedNamePath = self::replaceNameVariable($mutatorName, basename($filePath));
-
-            $newFilePath = $currentDirectory . '/src/Mutator/' . $replacedNamePath;
-
-            $fileSystem->dumpFile($newFilePath, $newContent);
-
-            $generatedFilePaths[] = $newFilePath;
-        }
+        $generatedFilePaths = $this->createProjectFilesFromTemplates($templateFilePaths, $mutatorName);
 
         $io->title('Generated files');
         $io->listing($generatedFilePaths);
@@ -121,4 +106,30 @@ private function askMutatorName(IO $io): mixed
             $question,
         );
     }
+
+    /**
+     * @param list<string> $filePaths
+     * @return list<string>
+     */
+    private function createProjectFilesFromTemplates(array $filePaths, string $mutatorName): array
+    {
+        $currentDirectory = getcwd();
+        $generatedFilePaths = [];
+
+        $fileSystem = $this->getApplication()->getContainer()->getFileSystem();
+
+        foreach ($filePaths as $filePath) {
+            // replace __Name__ with $mutatorName
+            $newContent = self::replaceNameVariable($mutatorName, file_get_contents($filePath));
+            $replacedNamePath = self::replaceNameVariable($mutatorName, basename($filePath));
+
+            $newFilePath = $currentDirectory . '/src/Mutator/' . $replacedNamePath;
+
+            $fileSystem->dumpFile($newFilePath, $newContent);
+
+            $generatedFilePaths[] = $newFilePath;
+        }
+
+        return $generatedFilePaths;
+    }
 }

From 39c46a2759ab64b2c3b4df63189ab0813cb13820 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:05:04 +0200
Subject: [PATCH 13/25] Fix type

---
 src/Command/CustomMutatorCommand.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index d5060bf723..7f6101a418 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -80,7 +80,7 @@ protected function executeCommand(IO $io): bool
         $io->title('Generated files');
         $io->listing($generatedFilePaths);
         $io->success(
-            sprintf('Base classes for the "%s" mutator were created. Complee the missing parts inside them.', $mutatorName),
+            sprintf('Base classes for the "%s" mutator were created. Complete the missing parts inside them.', $mutatorName),
         );
 
         return true;

From 317bd3d3b95d2f945037fa62f08f19a154d5086f Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:05:40 +0200
Subject: [PATCH 14/25] Reword info message

---
 src/Command/CustomMutatorCommand.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index 7f6101a418..98196bbb1f 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -80,7 +80,7 @@ protected function executeCommand(IO $io): bool
         $io->title('Generated files');
         $io->listing($generatedFilePaths);
         $io->success(
-            sprintf('Base classes for the "%s" mutator were created. Complete the missing parts inside them.', $mutatorName),
+            sprintf('Base classes for the mutator "%s" were created. Complete the missing parts inside them.', $mutatorName),
         );
 
         return true;

From 9a974618671641717e97c9e658268c8a773898ac Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:07:22 +0200
Subject: [PATCH 15/25] Move `getDefinition()` to the top of the mutator class

---
 src/CustomMutator/templates/__Name__.php | 32 ++++++++++++------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/src/CustomMutator/templates/__Name__.php b/src/CustomMutator/templates/__Name__.php
index 2b6ff49f31..fba35de265 100644
--- a/src/CustomMutator/templates/__Name__.php
+++ b/src/CustomMutator/templates/__Name__.php
@@ -41,6 +41,22 @@
 
 class __Name__ implements Mutator
 {
+    public static function getDefinition(): Definition
+    {
+        return new Definition(
+            <<<'TXT'
+                TODO: add description of this mutator here
+                TXT
+            ,
+            MutatorCategory::ORTHOGONAL_REPLACEMENT,
+            null,
+            <<<'DIFF'
+                - TODO: show the source code before mutation
+                + TODO: show the source code after mutation
+                DIFF,
+        );
+    }
+
     public function canMutate(Node $node): bool
     {
         // TODO: update the logic to decide if this mutator can mutate $node
@@ -58,22 +74,6 @@ public function mutate(Node $node): iterable
         yield $node;
     }
 
-    public static function getDefinition(): Definition
-    {
-        return new Definition(
-            <<<'TXT'
-                TODO: add description of this mutator here
-                TXT
-            ,
-            MutatorCategory::ORTHOGONAL_REPLACEMENT,
-            null,
-            <<<'DIFF'
-                - TODO: show the source code before mutation
-                + TODO: show the source code after mutation
-                DIFF,
-        );
-    }
-
     public function getName(): string
     {
         return self::class;

From f5d986d5ba18e14e35914a8d8c526ac72c8941b8 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:08:49 +0200
Subject: [PATCH 16/25] Inline `Mutator` property type

---
 src/Testing/BaseMutatorTestCase.php | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/Testing/BaseMutatorTestCase.php b/src/Testing/BaseMutatorTestCase.php
index 0df996d3aa..9d1a8bbe6d 100644
--- a/src/Testing/BaseMutatorTestCase.php
+++ b/src/Testing/BaseMutatorTestCase.php
@@ -55,10 +55,7 @@
 
 abstract class BaseMutatorTestCase extends TestCase
 {
-    /**
-     * @var Mutator
-     */
-    protected $mutator;
+    protected Mutator $mutator;
 
     protected function setUp(): void
     {

From 30f6764d17feae59cf6dc68dca9c906c3ceffb65 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:19:26 +0200
Subject: [PATCH 17/25] Rename base test method

---
 src/CustomMutator/templates/__Name__Test.php                  | 2 +-
 src/Testing/BaseMutatorTestCase.php                           | 4 ++--
 tests/phpunit/Mutator/Arithmetic/AssignmentEqualTest.php      | 2 +-
 tests/phpunit/Mutator/Arithmetic/AssignmentTest.php           | 2 +-
 tests/phpunit/Mutator/Arithmetic/BitwiseAndTest.php           | 2 +-
 tests/phpunit/Mutator/Arithmetic/BitwiseNotTest.php           | 2 +-
 tests/phpunit/Mutator/Arithmetic/BitwiseOrTest.php            | 2 +-
 tests/phpunit/Mutator/Arithmetic/BitwiseXorTest.php           | 2 +-
 tests/phpunit/Mutator/Arithmetic/DecrementTest.php            | 2 +-
 tests/phpunit/Mutator/Arithmetic/DivEqualTest.php             | 2 +-
 tests/phpunit/Mutator/Arithmetic/DivisionTest.php             | 2 +-
 tests/phpunit/Mutator/Arithmetic/ExponentiationTest.php       | 2 +-
 tests/phpunit/Mutator/Arithmetic/IncrementTest.php            | 2 +-
 tests/phpunit/Mutator/Arithmetic/MinusEqualTest.php           | 2 +-
 tests/phpunit/Mutator/Arithmetic/MinusTest.php                | 2 +-
 tests/phpunit/Mutator/Arithmetic/ModEqualTest.php             | 2 +-
 tests/phpunit/Mutator/Arithmetic/ModulusTest.php              | 2 +-
 tests/phpunit/Mutator/Arithmetic/MulEqualTest.php             | 2 +-
 tests/phpunit/Mutator/Arithmetic/MultiplicationTest.php       | 2 +-
 tests/phpunit/Mutator/Arithmetic/PlusEqualTest.php            | 2 +-
 tests/phpunit/Mutator/Arithmetic/PlusTest.php                 | 2 +-
 tests/phpunit/Mutator/Arithmetic/PowEqualTest.php             | 2 +-
 tests/phpunit/Mutator/Arithmetic/RoundingFamilyTest.php       | 2 +-
 tests/phpunit/Mutator/Arithmetic/ShiftLeftTest.php            | 2 +-
 tests/phpunit/Mutator/Arithmetic/ShiftRightTest.php           | 2 +-
 tests/phpunit/Mutator/Boolean/ArrayItemTest.php               | 2 +-
 tests/phpunit/Mutator/Boolean/EqualIdenticalTest.php          | 2 +-
 tests/phpunit/Mutator/Boolean/FalseValueTest.php              | 2 +-
 tests/phpunit/Mutator/Boolean/IdenticalEqualTest.php          | 2 +-
 tests/phpunit/Mutator/Boolean/InstanceOf_Test.php             | 2 +-
 .../Mutator/Boolean/LogicalAndAllSubExprNegationTest.php      | 2 +-
 tests/phpunit/Mutator/Boolean/LogicalAndNegationTest.php      | 2 +-
 .../Mutator/Boolean/LogicalAndSingleSubExprNegationTest.php   | 2 +-
 tests/phpunit/Mutator/Boolean/LogicalAndTest.php              | 2 +-
 tests/phpunit/Mutator/Boolean/LogicalLowerAndTest.php         | 2 +-
 tests/phpunit/Mutator/Boolean/LogicalLowerOrTest.php          | 2 +-
 tests/phpunit/Mutator/Boolean/LogicalNotTest.php              | 2 +-
 .../Mutator/Boolean/LogicalOrAllSubExprNegationTest.php       | 2 +-
 tests/phpunit/Mutator/Boolean/LogicalOrNegationTest.php       | 2 +-
 .../Mutator/Boolean/LogicalOrSingleSubExprNegationTest.php    | 2 +-
 tests/phpunit/Mutator/Boolean/LogicalOrTest.php               | 2 +-
 tests/phpunit/Mutator/Boolean/NotEqualNotIdenticalTest.php    | 2 +-
 tests/phpunit/Mutator/Boolean/NotIdenticalNotEqualTest.php    | 2 +-
 tests/phpunit/Mutator/Boolean/TrueValueTest.php               | 2 +-
 tests/phpunit/Mutator/Boolean/Yield_Test.php                  | 2 +-
 tests/phpunit/Mutator/Cast/CastArrayTest.php                  | 2 +-
 tests/phpunit/Mutator/Cast/CastBoolTest.php                   | 2 +-
 tests/phpunit/Mutator/Cast/CastFloatTest.php                  | 2 +-
 tests/phpunit/Mutator/Cast/CastIntTest.php                    | 2 +-
 tests/phpunit/Mutator/Cast/CastObjectTest.php                 | 2 +-
 tests/phpunit/Mutator/Cast/CastStringTest.php                 | 2 +-
 .../Mutator/ConditionalBoundary/GreaterThanOrEqualToTest.php  | 2 +-
 tests/phpunit/Mutator/ConditionalBoundary/GreaterThanTest.php | 2 +-
 .../Mutator/ConditionalBoundary/LessThanOrEqualToTest.php     | 2 +-
 tests/phpunit/Mutator/ConditionalBoundary/LessThanTest.php    | 2 +-
 tests/phpunit/Mutator/ConditionalNegotiation/EqualTest.php    | 2 +-
 .../ConditionalNegotiation/GreaterThanNegotiationTest.php     | 2 +-
 .../GreaterThanOrEqualToNegotiationTest.php                   | 2 +-
 .../phpunit/Mutator/ConditionalNegotiation/IdenticalTest.php  | 2 +-
 .../ConditionalNegotiation/LessThanNegotiationTest.php        | 2 +-
 .../LessThanOrEqualToNegotiationTest.php                      | 2 +-
 tests/phpunit/Mutator/ConditionalNegotiation/NotEqualTest.php | 2 +-
 .../Mutator/ConditionalNegotiation/NotIdenticalTest.php       | 2 +-
 tests/phpunit/Mutator/Extensions/BCMathTest.php               | 2 +-
 tests/phpunit/Mutator/Extensions/MBStringTest.php             | 2 +-
 .../Mutator/FunctionSignature/ProtectedVisibilityTest.php     | 2 +-
 .../Mutator/FunctionSignature/PublicVisibilityTest.php        | 4 ++--
 tests/phpunit/Mutator/Loop/DoWhileTest.php                    | 2 +-
 tests/phpunit/Mutator/Loop/For_Test.php                       | 2 +-
 tests/phpunit/Mutator/Loop/Foreach_Test.php                   | 2 +-
 tests/phpunit/Mutator/Loop/While_Test.php                     | 2 +-
 tests/phpunit/Mutator/Number/DecrementIntegerTest.php         | 2 +-
 tests/phpunit/Mutator/Number/IncrementIntegerTest.php         | 2 +-
 tests/phpunit/Mutator/Number/OneZeroFloatTest.php             | 2 +-
 tests/phpunit/Mutator/Operator/AssignCoalesceTest.php         | 2 +-
 tests/phpunit/Mutator/Operator/Break_Test.php                 | 2 +-
 tests/phpunit/Mutator/Operator/Catch_Test.php                 | 2 +-
 tests/phpunit/Mutator/Operator/CoalesceTest.php               | 2 +-
 tests/phpunit/Mutator/Operator/ConcatTest.php                 | 2 +-
 tests/phpunit/Mutator/Operator/Continue_Test.php              | 2 +-
 tests/phpunit/Mutator/Operator/ElseIfNegationTest.php         | 2 +-
 tests/phpunit/Mutator/Operator/Finally_Test.php               | 2 +-
 tests/phpunit/Mutator/Operator/IfNegationTest.php             | 2 +-
 tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php     | 2 +-
 tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php   | 2 +-
 tests/phpunit/Mutator/Operator/SpreadAssignmentTest.php       | 2 +-
 tests/phpunit/Mutator/Operator/SpreadOneItemTest.php          | 2 +-
 tests/phpunit/Mutator/Operator/SpreadRemovalTest.php          | 2 +-
 tests/phpunit/Mutator/Operator/TernaryTest.php                | 2 +-
 tests/phpunit/Mutator/Operator/Throw_Test.php                 | 2 +-
 tests/phpunit/Mutator/Regex/PregMatchMatchesTest.php          | 2 +-
 tests/phpunit/Mutator/Regex/PregMatchRemoveCaretTest.php      | 2 +-
 tests/phpunit/Mutator/Regex/PregMatchRemoveDollarTest.php     | 2 +-
 tests/phpunit/Mutator/Regex/PregMatchRemoveFlagsTest.php      | 2 +-
 tests/phpunit/Mutator/Regex/PregQuoteTest.php                 | 2 +-
 tests/phpunit/Mutator/Removal/ArrayItemRemovalTest.php        | 2 +-
 tests/phpunit/Mutator/Removal/CatchBlockRemovalTest.php       | 2 +-
 tests/phpunit/Mutator/Removal/CloneRemovalTest.php            | 2 +-
 tests/phpunit/Mutator/Removal/ConcatOperandRemovalTest.php    | 2 +-
 tests/phpunit/Mutator/Removal/FunctionCallRemovalTest.php     | 2 +-
 tests/phpunit/Mutator/Removal/MatchArmRemovalTest.php         | 2 +-
 tests/phpunit/Mutator/Removal/MethodCallRemovalTest.php       | 2 +-
 tests/phpunit/Mutator/Removal/SharedCaseRemovalTest.php       | 2 +-
 tests/phpunit/Mutator/ReturnValue/ArrayOneItemTest.php        | 2 +-
 tests/phpunit/Mutator/ReturnValue/FloatNegationTest.php       | 2 +-
 tests/phpunit/Mutator/ReturnValue/FunctionCallTest.php        | 2 +-
 tests/phpunit/Mutator/ReturnValue/IntegerNegationTest.php     | 2 +-
 tests/phpunit/Mutator/ReturnValue/NewObjectTest.php           | 2 +-
 tests/phpunit/Mutator/ReturnValue/ThisTest.php                | 2 +-
 tests/phpunit/Mutator/ReturnValue/YieldValueTest.php          | 2 +-
 tests/phpunit/Mutator/Sort/SpaceshipTest.php                  | 2 +-
 tests/phpunit/Mutator/SyntaxErrorTest.php                     | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayChangeKeyCaseTest.php | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayChunkTest.php         | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayColumnTest.php        | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayCombineTest.php       | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffAssocTest.php     | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffKeyTest.php       | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffTest.php          | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUassocTest.php    | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUkeyTest.php      | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayFilterTest.php        | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayFlipTest.php          | 2 +-
 .../phpunit/Mutator/Unwrap/UnwrapArrayIntersectAssocTest.php  | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectKeyTest.php  | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectTest.php     | 2 +-
 .../phpunit/Mutator/Unwrap/UnwrapArrayIntersectUassocTest.php | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUkeyTest.php | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayKeysTest.php          | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayMapTest.php           | 2 +-
 .../phpunit/Mutator/Unwrap/UnwrapArrayMergeRecursiveTest.php  | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeTest.php         | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayPadTest.php           | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayReduceTest.php        | 2 +-
 .../Mutator/Unwrap/UnwrapArrayReplaceRecursiveTest.php        | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceTest.php       | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayReverseTest.php       | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArraySliceTest.php         | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArraySpliceTest.php        | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffAssocTest.php    | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffTest.php         | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffUassocTest.php   | 2 +-
 .../phpunit/Mutator/Unwrap/UnwrapArrayUintersectAssocTest.php | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectTest.php    | 2 +-
 .../Mutator/Unwrap/UnwrapArrayUintersectUassocTest.php        | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayUniqueTest.php        | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapArrayValuesTest.php        | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapFinallyTest.php            | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapLcFirstTest.php            | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapLtrimTest.php              | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapRtrimTest.php              | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapStrIreplaceTest.php        | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapStrRepeatTest.php          | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapStrReplaceTest.php         | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapStrRevTest.php             | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapStrShuffleTest.php         | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapStrToLowerTest.php         | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapStrToUpperTest.php         | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapSubstrTest.php             | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapTrimTest.php               | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapUcFirstTest.php            | 2 +-
 tests/phpunit/Mutator/Unwrap/UnwrapUcWordsTest.php            | 2 +-
 162 files changed, 164 insertions(+), 164 deletions(-)

diff --git a/src/CustomMutator/templates/__Name__Test.php b/src/CustomMutator/templates/__Name__Test.php
index 01adbfaef3..f50f34323f 100644
--- a/src/CustomMutator/templates/__Name__Test.php
+++ b/src/CustomMutator/templates/__Name__Test.php
@@ -49,7 +49,7 @@ final class __Name__Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/src/Testing/BaseMutatorTestCase.php b/src/Testing/BaseMutatorTestCase.php
index 9d1a8bbe6d..3ee07a9a7c 100644
--- a/src/Testing/BaseMutatorTestCase.php
+++ b/src/Testing/BaseMutatorTestCase.php
@@ -64,10 +64,10 @@ protected function setUp(): void
     }
 
     /**
-     * @param string|string[] $expectedCode
+     * @param string|string[]|null $expectedCode
      * @param mixed[] $settings
      */
-    final public function doTest(string $inputCode, $expectedCode = [], array $settings = [], bool $allowInvalidCode = false): void
+    final protected function assertMutatesInput(string $inputCode, string|array|null $expectedCode = [], array $settings = [], bool $allowInvalidCode = false): void
     {
         $expectedCodeSamples = (array) $expectedCode;
 
diff --git a/tests/phpunit/Mutator/Arithmetic/AssignmentEqualTest.php b/tests/phpunit/Mutator/Arithmetic/AssignmentEqualTest.php
index aee74901f6..abe9aac25f 100644
--- a/tests/phpunit/Mutator/Arithmetic/AssignmentEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/AssignmentEqualTest.php
@@ -49,7 +49,7 @@ final class AssignmentEqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/AssignmentTest.php b/tests/phpunit/Mutator/Arithmetic/AssignmentTest.php
index 94f7fde654..7be8c7f946 100644
--- a/tests/phpunit/Mutator/Arithmetic/AssignmentTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/AssignmentTest.php
@@ -49,7 +49,7 @@ final class AssignmentTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/BitwiseAndTest.php b/tests/phpunit/Mutator/Arithmetic/BitwiseAndTest.php
index ece328c4d9..ed3e056661 100644
--- a/tests/phpunit/Mutator/Arithmetic/BitwiseAndTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/BitwiseAndTest.php
@@ -49,7 +49,7 @@ final class BitwiseAndTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/BitwiseNotTest.php b/tests/phpunit/Mutator/Arithmetic/BitwiseNotTest.php
index df256195f2..9d37e88b99 100644
--- a/tests/phpunit/Mutator/Arithmetic/BitwiseNotTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/BitwiseNotTest.php
@@ -49,7 +49,7 @@ final class BitwiseNotTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/BitwiseOrTest.php b/tests/phpunit/Mutator/Arithmetic/BitwiseOrTest.php
index 68d53d4b90..ed07991351 100644
--- a/tests/phpunit/Mutator/Arithmetic/BitwiseOrTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/BitwiseOrTest.php
@@ -49,7 +49,7 @@ final class BitwiseOrTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/BitwiseXorTest.php b/tests/phpunit/Mutator/Arithmetic/BitwiseXorTest.php
index 83ae63a3ba..f4c90bb099 100644
--- a/tests/phpunit/Mutator/Arithmetic/BitwiseXorTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/BitwiseXorTest.php
@@ -49,7 +49,7 @@ final class BitwiseXorTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/DecrementTest.php b/tests/phpunit/Mutator/Arithmetic/DecrementTest.php
index 3ae82b3b5e..e31ee1fe62 100644
--- a/tests/phpunit/Mutator/Arithmetic/DecrementTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/DecrementTest.php
@@ -49,7 +49,7 @@ final class DecrementTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/DivEqualTest.php b/tests/phpunit/Mutator/Arithmetic/DivEqualTest.php
index b087b68968..598d0519dc 100644
--- a/tests/phpunit/Mutator/Arithmetic/DivEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/DivEqualTest.php
@@ -49,7 +49,7 @@ final class DivEqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/DivisionTest.php b/tests/phpunit/Mutator/Arithmetic/DivisionTest.php
index 7f79841636..b2e52e407b 100644
--- a/tests/phpunit/Mutator/Arithmetic/DivisionTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/DivisionTest.php
@@ -49,7 +49,7 @@ final class DivisionTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/ExponentiationTest.php b/tests/phpunit/Mutator/Arithmetic/ExponentiationTest.php
index 60b918982c..86d6b85ebb 100644
--- a/tests/phpunit/Mutator/Arithmetic/ExponentiationTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/ExponentiationTest.php
@@ -49,7 +49,7 @@ final class ExponentiationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/IncrementTest.php b/tests/phpunit/Mutator/Arithmetic/IncrementTest.php
index 7edd6e9a6f..166b05ccfe 100644
--- a/tests/phpunit/Mutator/Arithmetic/IncrementTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/IncrementTest.php
@@ -49,7 +49,7 @@ final class IncrementTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/MinusEqualTest.php b/tests/phpunit/Mutator/Arithmetic/MinusEqualTest.php
index 6c1eb79890..fc52809c4c 100644
--- a/tests/phpunit/Mutator/Arithmetic/MinusEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/MinusEqualTest.php
@@ -49,7 +49,7 @@ final class MinusEqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/MinusTest.php b/tests/phpunit/Mutator/Arithmetic/MinusTest.php
index ed0929cb6e..c1f2576ebf 100644
--- a/tests/phpunit/Mutator/Arithmetic/MinusTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/MinusTest.php
@@ -49,7 +49,7 @@ final class MinusTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/ModEqualTest.php b/tests/phpunit/Mutator/Arithmetic/ModEqualTest.php
index 7f072e0ac7..5932063bdd 100644
--- a/tests/phpunit/Mutator/Arithmetic/ModEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/ModEqualTest.php
@@ -49,7 +49,7 @@ final class ModEqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/ModulusTest.php b/tests/phpunit/Mutator/Arithmetic/ModulusTest.php
index f6f5de6ddb..a6ef62754c 100644
--- a/tests/phpunit/Mutator/Arithmetic/ModulusTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/ModulusTest.php
@@ -49,7 +49,7 @@ final class ModulusTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/MulEqualTest.php b/tests/phpunit/Mutator/Arithmetic/MulEqualTest.php
index 99aefa4b59..481529cfd6 100644
--- a/tests/phpunit/Mutator/Arithmetic/MulEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/MulEqualTest.php
@@ -49,7 +49,7 @@ final class MulEqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/MultiplicationTest.php b/tests/phpunit/Mutator/Arithmetic/MultiplicationTest.php
index d5e75654c5..f5429c61bc 100644
--- a/tests/phpunit/Mutator/Arithmetic/MultiplicationTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/MultiplicationTest.php
@@ -49,7 +49,7 @@ final class MultiplicationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/PlusEqualTest.php b/tests/phpunit/Mutator/Arithmetic/PlusEqualTest.php
index ee394aacf3..b931b5864a 100644
--- a/tests/phpunit/Mutator/Arithmetic/PlusEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/PlusEqualTest.php
@@ -49,7 +49,7 @@ final class PlusEqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/PlusTest.php b/tests/phpunit/Mutator/Arithmetic/PlusTest.php
index 2b79391178..1176aa1ecc 100644
--- a/tests/phpunit/Mutator/Arithmetic/PlusTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/PlusTest.php
@@ -52,7 +52,7 @@ final class PlusTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/PowEqualTest.php b/tests/phpunit/Mutator/Arithmetic/PowEqualTest.php
index b10283ff9f..46c0c542e0 100644
--- a/tests/phpunit/Mutator/Arithmetic/PowEqualTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/PowEqualTest.php
@@ -49,7 +49,7 @@ final class PowEqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/RoundingFamilyTest.php b/tests/phpunit/Mutator/Arithmetic/RoundingFamilyTest.php
index 99eaa74b02..31f8045866 100644
--- a/tests/phpunit/Mutator/Arithmetic/RoundingFamilyTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/RoundingFamilyTest.php
@@ -49,7 +49,7 @@ final class RoundingFamilyTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/ShiftLeftTest.php b/tests/phpunit/Mutator/Arithmetic/ShiftLeftTest.php
index 302031a43e..ff06fff410 100644
--- a/tests/phpunit/Mutator/Arithmetic/ShiftLeftTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/ShiftLeftTest.php
@@ -49,7 +49,7 @@ final class ShiftLeftTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Arithmetic/ShiftRightTest.php b/tests/phpunit/Mutator/Arithmetic/ShiftRightTest.php
index be973d7e95..b356da1e3c 100644
--- a/tests/phpunit/Mutator/Arithmetic/ShiftRightTest.php
+++ b/tests/phpunit/Mutator/Arithmetic/ShiftRightTest.php
@@ -49,7 +49,7 @@ final class ShiftRightTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/ArrayItemTest.php b/tests/phpunit/Mutator/Boolean/ArrayItemTest.php
index 418939ee90..8fbdf5e4ee 100644
--- a/tests/phpunit/Mutator/Boolean/ArrayItemTest.php
+++ b/tests/phpunit/Mutator/Boolean/ArrayItemTest.php
@@ -49,7 +49,7 @@ final class ArrayItemTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/EqualIdenticalTest.php b/tests/phpunit/Mutator/Boolean/EqualIdenticalTest.php
index 1c796f8417..864f86c3c4 100644
--- a/tests/phpunit/Mutator/Boolean/EqualIdenticalTest.php
+++ b/tests/phpunit/Mutator/Boolean/EqualIdenticalTest.php
@@ -49,7 +49,7 @@ final class EqualIdenticalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/FalseValueTest.php b/tests/phpunit/Mutator/Boolean/FalseValueTest.php
index 51169caa3f..ba251fed7a 100644
--- a/tests/phpunit/Mutator/Boolean/FalseValueTest.php
+++ b/tests/phpunit/Mutator/Boolean/FalseValueTest.php
@@ -51,7 +51,7 @@ final class FalseValueTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/IdenticalEqualTest.php b/tests/phpunit/Mutator/Boolean/IdenticalEqualTest.php
index 892f1d9a64..1d203e735a 100644
--- a/tests/phpunit/Mutator/Boolean/IdenticalEqualTest.php
+++ b/tests/phpunit/Mutator/Boolean/IdenticalEqualTest.php
@@ -49,7 +49,7 @@ final class IdenticalEqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/InstanceOf_Test.php b/tests/phpunit/Mutator/Boolean/InstanceOf_Test.php
index 2947e47914..de128ac1de 100644
--- a/tests/phpunit/Mutator/Boolean/InstanceOf_Test.php
+++ b/tests/phpunit/Mutator/Boolean/InstanceOf_Test.php
@@ -49,7 +49,7 @@ final class InstanceOf_Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalAndAllSubExprNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalAndAllSubExprNegationTest.php
index d94b94c248..b05964df26 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalAndAllSubExprNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalAndAllSubExprNegationTest.php
@@ -49,7 +49,7 @@ final class LogicalAndAllSubExprNegationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalAndNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalAndNegationTest.php
index d6f59c6704..07a5c4a632 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalAndNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalAndNegationTest.php
@@ -49,7 +49,7 @@ final class LogicalAndNegationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalAndSingleSubExprNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalAndSingleSubExprNegationTest.php
index 9ddc94af87..bbbf070d4d 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalAndSingleSubExprNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalAndSingleSubExprNegationTest.php
@@ -49,7 +49,7 @@ final class LogicalAndSingleSubExprNegationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalAndTest.php b/tests/phpunit/Mutator/Boolean/LogicalAndTest.php
index 40e3e9397e..169ad96f02 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalAndTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalAndTest.php
@@ -49,7 +49,7 @@ final class LogicalAndTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalLowerAndTest.php b/tests/phpunit/Mutator/Boolean/LogicalLowerAndTest.php
index d9ed19bdb6..d1ad938e16 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalLowerAndTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalLowerAndTest.php
@@ -49,7 +49,7 @@ final class LogicalLowerAndTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalLowerOrTest.php b/tests/phpunit/Mutator/Boolean/LogicalLowerOrTest.php
index 58b0f32b92..815d4e6ed8 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalLowerOrTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalLowerOrTest.php
@@ -49,7 +49,7 @@ final class LogicalLowerOrTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalNotTest.php b/tests/phpunit/Mutator/Boolean/LogicalNotTest.php
index ae84566a0b..92c66c57f8 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalNotTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalNotTest.php
@@ -52,7 +52,7 @@ final class LogicalNotTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalOrAllSubExprNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalOrAllSubExprNegationTest.php
index 5c6b35884d..93dc9f4a7c 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalOrAllSubExprNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalOrAllSubExprNegationTest.php
@@ -49,7 +49,7 @@ final class LogicalOrAllSubExprNegationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalOrNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalOrNegationTest.php
index cbc9cf913a..8d86e60047 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalOrNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalOrNegationTest.php
@@ -49,7 +49,7 @@ final class LogicalOrNegationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalOrSingleSubExprNegationTest.php b/tests/phpunit/Mutator/Boolean/LogicalOrSingleSubExprNegationTest.php
index 9672ce415a..51f5ec4075 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalOrSingleSubExprNegationTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalOrSingleSubExprNegationTest.php
@@ -49,7 +49,7 @@ final class LogicalOrSingleSubExprNegationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/LogicalOrTest.php b/tests/phpunit/Mutator/Boolean/LogicalOrTest.php
index 92ca2ed646..3ee686f146 100644
--- a/tests/phpunit/Mutator/Boolean/LogicalOrTest.php
+++ b/tests/phpunit/Mutator/Boolean/LogicalOrTest.php
@@ -49,7 +49,7 @@ final class LogicalOrTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/NotEqualNotIdenticalTest.php b/tests/phpunit/Mutator/Boolean/NotEqualNotIdenticalTest.php
index b120b270b9..296062a634 100644
--- a/tests/phpunit/Mutator/Boolean/NotEqualNotIdenticalTest.php
+++ b/tests/phpunit/Mutator/Boolean/NotEqualNotIdenticalTest.php
@@ -49,7 +49,7 @@ final class NotEqualNotIdenticalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/NotIdenticalNotEqualTest.php b/tests/phpunit/Mutator/Boolean/NotIdenticalNotEqualTest.php
index bc6d337a90..f45e4264aa 100644
--- a/tests/phpunit/Mutator/Boolean/NotIdenticalNotEqualTest.php
+++ b/tests/phpunit/Mutator/Boolean/NotIdenticalNotEqualTest.php
@@ -49,7 +49,7 @@ final class NotIdenticalNotEqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/TrueValueTest.php b/tests/phpunit/Mutator/Boolean/TrueValueTest.php
index 20ebe5f031..e0e83af931 100644
--- a/tests/phpunit/Mutator/Boolean/TrueValueTest.php
+++ b/tests/phpunit/Mutator/Boolean/TrueValueTest.php
@@ -52,7 +52,7 @@ final class TrueValueTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate($input, $expected = [], array $settings = []): void
     {
-        $this->doTest($input, $expected, $settings);
+        $this->assertMutatesInput($input, $expected, $settings);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Boolean/Yield_Test.php b/tests/phpunit/Mutator/Boolean/Yield_Test.php
index 140736ab3c..8d3ec7eb5a 100644
--- a/tests/phpunit/Mutator/Boolean/Yield_Test.php
+++ b/tests/phpunit/Mutator/Boolean/Yield_Test.php
@@ -49,7 +49,7 @@ final class Yield_Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Cast/CastArrayTest.php b/tests/phpunit/Mutator/Cast/CastArrayTest.php
index d3578694e6..60c8eca1de 100644
--- a/tests/phpunit/Mutator/Cast/CastArrayTest.php
+++ b/tests/phpunit/Mutator/Cast/CastArrayTest.php
@@ -49,7 +49,7 @@ final class CastArrayTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Cast/CastBoolTest.php b/tests/phpunit/Mutator/Cast/CastBoolTest.php
index 6724993e4f..f326e263f9 100644
--- a/tests/phpunit/Mutator/Cast/CastBoolTest.php
+++ b/tests/phpunit/Mutator/Cast/CastBoolTest.php
@@ -49,7 +49,7 @@ final class CastBoolTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Cast/CastFloatTest.php b/tests/phpunit/Mutator/Cast/CastFloatTest.php
index 1906d59b61..73a5d31d4b 100644
--- a/tests/phpunit/Mutator/Cast/CastFloatTest.php
+++ b/tests/phpunit/Mutator/Cast/CastFloatTest.php
@@ -49,7 +49,7 @@ final class CastFloatTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Cast/CastIntTest.php b/tests/phpunit/Mutator/Cast/CastIntTest.php
index 257c0893f1..21061b21b1 100644
--- a/tests/phpunit/Mutator/Cast/CastIntTest.php
+++ b/tests/phpunit/Mutator/Cast/CastIntTest.php
@@ -49,7 +49,7 @@ final class CastIntTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Cast/CastObjectTest.php b/tests/phpunit/Mutator/Cast/CastObjectTest.php
index 1fbd0b4d09..d00a0d7684 100644
--- a/tests/phpunit/Mutator/Cast/CastObjectTest.php
+++ b/tests/phpunit/Mutator/Cast/CastObjectTest.php
@@ -49,7 +49,7 @@ final class CastObjectTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Cast/CastStringTest.php b/tests/phpunit/Mutator/Cast/CastStringTest.php
index 5b89a97415..ad9f9c3dcf 100644
--- a/tests/phpunit/Mutator/Cast/CastStringTest.php
+++ b/tests/phpunit/Mutator/Cast/CastStringTest.php
@@ -49,7 +49,7 @@ final class CastStringTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanOrEqualToTest.php b/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanOrEqualToTest.php
index 3a739ef020..79a86be030 100644
--- a/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanOrEqualToTest.php
+++ b/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanOrEqualToTest.php
@@ -49,7 +49,7 @@ final class GreaterThanOrEqualToTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanTest.php b/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanTest.php
index ef216d959d..1c948a7b20 100644
--- a/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanTest.php
+++ b/tests/phpunit/Mutator/ConditionalBoundary/GreaterThanTest.php
@@ -49,7 +49,7 @@ final class GreaterThanTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalBoundary/LessThanOrEqualToTest.php b/tests/phpunit/Mutator/ConditionalBoundary/LessThanOrEqualToTest.php
index 5f73ea79a2..dbac6af532 100644
--- a/tests/phpunit/Mutator/ConditionalBoundary/LessThanOrEqualToTest.php
+++ b/tests/phpunit/Mutator/ConditionalBoundary/LessThanOrEqualToTest.php
@@ -49,7 +49,7 @@ final class LessThanOrEqualToTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalBoundary/LessThanTest.php b/tests/phpunit/Mutator/ConditionalBoundary/LessThanTest.php
index 95ab1d852a..3e5f98ba3a 100644
--- a/tests/phpunit/Mutator/ConditionalBoundary/LessThanTest.php
+++ b/tests/phpunit/Mutator/ConditionalBoundary/LessThanTest.php
@@ -49,7 +49,7 @@ final class LessThanTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/EqualTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/EqualTest.php
index d2fd6625d5..508a194de8 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/EqualTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/EqualTest.php
@@ -49,7 +49,7 @@ final class EqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanNegotiationTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanNegotiationTest.php
index b6cb00e3e2..9298e71e07 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanNegotiationTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanNegotiationTest.php
@@ -49,7 +49,7 @@ final class GreaterThanNegotiationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanOrEqualToNegotiationTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanOrEqualToNegotiationTest.php
index 234958a00f..3bfd2270f8 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanOrEqualToNegotiationTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/GreaterThanOrEqualToNegotiationTest.php
@@ -49,7 +49,7 @@ final class GreaterThanOrEqualToNegotiationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/IdenticalTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/IdenticalTest.php
index de9b29a001..fec42b7bc2 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/IdenticalTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/IdenticalTest.php
@@ -49,7 +49,7 @@ final class IdenticalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/LessThanNegotiationTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/LessThanNegotiationTest.php
index 59ef525b38..06c42f8bba 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/LessThanNegotiationTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/LessThanNegotiationTest.php
@@ -49,7 +49,7 @@ final class LessThanNegotiationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/LessThanOrEqualToNegotiationTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/LessThanOrEqualToNegotiationTest.php
index dd2412bb19..089dc3858a 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/LessThanOrEqualToNegotiationTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/LessThanOrEqualToNegotiationTest.php
@@ -49,7 +49,7 @@ final class LessThanOrEqualToNegotiationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/NotEqualTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/NotEqualTest.php
index 36baa5d3c6..069b219baf 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/NotEqualTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/NotEqualTest.php
@@ -49,7 +49,7 @@ final class NotEqualTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ConditionalNegotiation/NotIdenticalTest.php b/tests/phpunit/Mutator/ConditionalNegotiation/NotIdenticalTest.php
index 4915983336..10f0ba737c 100644
--- a/tests/phpunit/Mutator/ConditionalNegotiation/NotIdenticalTest.php
+++ b/tests/phpunit/Mutator/ConditionalNegotiation/NotIdenticalTest.php
@@ -49,7 +49,7 @@ final class NotIdenticalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Extensions/BCMathTest.php b/tests/phpunit/Mutator/Extensions/BCMathTest.php
index 47389eb49b..62db652d53 100644
--- a/tests/phpunit/Mutator/Extensions/BCMathTest.php
+++ b/tests/phpunit/Mutator/Extensions/BCMathTest.php
@@ -54,7 +54,7 @@ final class BCMathTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = [], array $settings = []): void
     {
-        $this->doTest($input, $expected, $settings);
+        $this->assertMutatesInput($input, $expected, $settings);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Extensions/MBStringTest.php b/tests/phpunit/Mutator/Extensions/MBStringTest.php
index a18fd26210..51704908e8 100644
--- a/tests/phpunit/Mutator/Extensions/MBStringTest.php
+++ b/tests/phpunit/Mutator/Extensions/MBStringTest.php
@@ -56,7 +56,7 @@ public static function setUpBeforeClass(): void
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = [], array $settings = []): void
     {
-        $this->doTest($input, $expected, $settings);
+        $this->assertMutatesInput($input, $expected, $settings);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/FunctionSignature/ProtectedVisibilityTest.php b/tests/phpunit/Mutator/FunctionSignature/ProtectedVisibilityTest.php
index 5a7d530079..967afa8b46 100644
--- a/tests/phpunit/Mutator/FunctionSignature/ProtectedVisibilityTest.php
+++ b/tests/phpunit/Mutator/FunctionSignature/ProtectedVisibilityTest.php
@@ -52,7 +52,7 @@ final class ProtectedVisibilityTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/FunctionSignature/PublicVisibilityTest.php b/tests/phpunit/Mutator/FunctionSignature/PublicVisibilityTest.php
index 3ceeb47173..bbc239312f 100644
--- a/tests/phpunit/Mutator/FunctionSignature/PublicVisibilityTest.php
+++ b/tests/phpunit/Mutator/FunctionSignature/PublicVisibilityTest.php
@@ -51,7 +51,7 @@ public function test_it_does_not_modify_blacklisted_functions(string $functionNa
     {
         $code = MutatorFixturesProvider::getFixtureFileContent(self::class, "pv-{$functionName}.php");
 
-        $this->doTest($code);
+        $this->assertMutatesInput($code);
     }
 
     public static function blacklistedProvider(): array
@@ -76,7 +76,7 @@ public static function blacklistedProvider(): array
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Loop/DoWhileTest.php b/tests/phpunit/Mutator/Loop/DoWhileTest.php
index e8aa75116e..e7e14d2931 100644
--- a/tests/phpunit/Mutator/Loop/DoWhileTest.php
+++ b/tests/phpunit/Mutator/Loop/DoWhileTest.php
@@ -49,7 +49,7 @@ final class DoWhileTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Loop/For_Test.php b/tests/phpunit/Mutator/Loop/For_Test.php
index d102a2f2dd..b15c97d501 100644
--- a/tests/phpunit/Mutator/Loop/For_Test.php
+++ b/tests/phpunit/Mutator/Loop/For_Test.php
@@ -49,7 +49,7 @@ final class For_Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Loop/Foreach_Test.php b/tests/phpunit/Mutator/Loop/Foreach_Test.php
index ac6954b563..7ffc4b9968 100644
--- a/tests/phpunit/Mutator/Loop/Foreach_Test.php
+++ b/tests/phpunit/Mutator/Loop/Foreach_Test.php
@@ -49,7 +49,7 @@ final class Foreach_Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Loop/While_Test.php b/tests/phpunit/Mutator/Loop/While_Test.php
index a09b39fd01..d904245d35 100644
--- a/tests/phpunit/Mutator/Loop/While_Test.php
+++ b/tests/phpunit/Mutator/Loop/While_Test.php
@@ -49,7 +49,7 @@ final class While_Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Number/DecrementIntegerTest.php b/tests/phpunit/Mutator/Number/DecrementIntegerTest.php
index f83f455447..60fde63e88 100644
--- a/tests/phpunit/Mutator/Number/DecrementIntegerTest.php
+++ b/tests/phpunit/Mutator/Number/DecrementIntegerTest.php
@@ -51,7 +51,7 @@ final class DecrementIntegerTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Number/IncrementIntegerTest.php b/tests/phpunit/Mutator/Number/IncrementIntegerTest.php
index a64709bf04..c4f46a761b 100644
--- a/tests/phpunit/Mutator/Number/IncrementIntegerTest.php
+++ b/tests/phpunit/Mutator/Number/IncrementIntegerTest.php
@@ -51,7 +51,7 @@ final class IncrementIntegerTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Number/OneZeroFloatTest.php b/tests/phpunit/Mutator/Number/OneZeroFloatTest.php
index 623d961c48..e043a4ada3 100644
--- a/tests/phpunit/Mutator/Number/OneZeroFloatTest.php
+++ b/tests/phpunit/Mutator/Number/OneZeroFloatTest.php
@@ -49,7 +49,7 @@ final class OneZeroFloatTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/AssignCoalesceTest.php b/tests/phpunit/Mutator/Operator/AssignCoalesceTest.php
index 96e35b72d4..a02f38f649 100644
--- a/tests/phpunit/Mutator/Operator/AssignCoalesceTest.php
+++ b/tests/phpunit/Mutator/Operator/AssignCoalesceTest.php
@@ -49,7 +49,7 @@ final class AssignCoalesceTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/Break_Test.php b/tests/phpunit/Mutator/Operator/Break_Test.php
index 38f09c8d54..d8c928e098 100644
--- a/tests/phpunit/Mutator/Operator/Break_Test.php
+++ b/tests/phpunit/Mutator/Operator/Break_Test.php
@@ -49,7 +49,7 @@ final class Break_Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/Catch_Test.php b/tests/phpunit/Mutator/Operator/Catch_Test.php
index 91cbb533c8..2ddb9b8e6f 100644
--- a/tests/phpunit/Mutator/Operator/Catch_Test.php
+++ b/tests/phpunit/Mutator/Operator/Catch_Test.php
@@ -49,7 +49,7 @@ final class Catch_Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, array|string $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/CoalesceTest.php b/tests/phpunit/Mutator/Operator/CoalesceTest.php
index 28573a128d..b649748bf0 100644
--- a/tests/phpunit/Mutator/Operator/CoalesceTest.php
+++ b/tests/phpunit/Mutator/Operator/CoalesceTest.php
@@ -49,7 +49,7 @@ final class CoalesceTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/ConcatTest.php b/tests/phpunit/Mutator/Operator/ConcatTest.php
index bf1f759db6..cf48602ec2 100644
--- a/tests/phpunit/Mutator/Operator/ConcatTest.php
+++ b/tests/phpunit/Mutator/Operator/ConcatTest.php
@@ -49,7 +49,7 @@ final class ConcatTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/Continue_Test.php b/tests/phpunit/Mutator/Operator/Continue_Test.php
index 2c61c9b004..b50f430ce6 100644
--- a/tests/phpunit/Mutator/Operator/Continue_Test.php
+++ b/tests/phpunit/Mutator/Operator/Continue_Test.php
@@ -49,7 +49,7 @@ final class Continue_Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/ElseIfNegationTest.php b/tests/phpunit/Mutator/Operator/ElseIfNegationTest.php
index 61ea6eecfa..04329c21fd 100644
--- a/tests/phpunit/Mutator/Operator/ElseIfNegationTest.php
+++ b/tests/phpunit/Mutator/Operator/ElseIfNegationTest.php
@@ -49,7 +49,7 @@ final class ElseIfNegationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/Finally_Test.php b/tests/phpunit/Mutator/Operator/Finally_Test.php
index 0bff1045ad..cd827e51c8 100644
--- a/tests/phpunit/Mutator/Operator/Finally_Test.php
+++ b/tests/phpunit/Mutator/Operator/Finally_Test.php
@@ -49,7 +49,7 @@ final class Finally_Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/IfNegationTest.php b/tests/phpunit/Mutator/Operator/IfNegationTest.php
index 12e84cab23..b6d7f81064 100644
--- a/tests/phpunit/Mutator/Operator/IfNegationTest.php
+++ b/tests/phpunit/Mutator/Operator/IfNegationTest.php
@@ -49,7 +49,7 @@ final class IfNegationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php b/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php
index e265c7e96e..3dffbc2d8c 100644
--- a/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php
+++ b/tests/phpunit/Mutator/Operator/NullSafeMethodCallTest.php
@@ -54,7 +54,7 @@ public function test_it_can_mutate(string $input, $expected = []): void
             $this->markTestSkipped('Null Safe operator is available only in PHP 8 or higher');
         }
 
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php b/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php
index ac76cd0db7..f6c9e36aa3 100644
--- a/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php
+++ b/tests/phpunit/Mutator/Operator/NullSafePropertyCallTest.php
@@ -54,7 +54,7 @@ public function test_it_can_mutate(string $input, $expected = []): void
             $this->markTestSkipped('Null Safe operator is available only in PHP 8 or higher');
         }
 
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/SpreadAssignmentTest.php b/tests/phpunit/Mutator/Operator/SpreadAssignmentTest.php
index cf6f793595..8dcaead761 100644
--- a/tests/phpunit/Mutator/Operator/SpreadAssignmentTest.php
+++ b/tests/phpunit/Mutator/Operator/SpreadAssignmentTest.php
@@ -49,7 +49,7 @@ final class SpreadAssignmentTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/SpreadOneItemTest.php b/tests/phpunit/Mutator/Operator/SpreadOneItemTest.php
index 0f34a68f1d..203880ee26 100644
--- a/tests/phpunit/Mutator/Operator/SpreadOneItemTest.php
+++ b/tests/phpunit/Mutator/Operator/SpreadOneItemTest.php
@@ -49,7 +49,7 @@ final class SpreadOneItemTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/SpreadRemovalTest.php b/tests/phpunit/Mutator/Operator/SpreadRemovalTest.php
index 2a83c13777..bff85b7ce8 100644
--- a/tests/phpunit/Mutator/Operator/SpreadRemovalTest.php
+++ b/tests/phpunit/Mutator/Operator/SpreadRemovalTest.php
@@ -49,7 +49,7 @@ final class SpreadRemovalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/TernaryTest.php b/tests/phpunit/Mutator/Operator/TernaryTest.php
index d86d532646..68188daa9a 100644
--- a/tests/phpunit/Mutator/Operator/TernaryTest.php
+++ b/tests/phpunit/Mutator/Operator/TernaryTest.php
@@ -50,7 +50,7 @@ final class TernaryTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Operator/Throw_Test.php b/tests/phpunit/Mutator/Operator/Throw_Test.php
index d97d7c82ee..9b1b6f3d03 100644
--- a/tests/phpunit/Mutator/Operator/Throw_Test.php
+++ b/tests/phpunit/Mutator/Operator/Throw_Test.php
@@ -49,7 +49,7 @@ final class Throw_Test extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Regex/PregMatchMatchesTest.php b/tests/phpunit/Mutator/Regex/PregMatchMatchesTest.php
index 47ce72a565..8b46b94b7c 100644
--- a/tests/phpunit/Mutator/Regex/PregMatchMatchesTest.php
+++ b/tests/phpunit/Mutator/Regex/PregMatchMatchesTest.php
@@ -49,7 +49,7 @@ final class PregMatchMatchesTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $output = []): void
     {
-        $this->doTest($input, $output);
+        $this->assertMutatesInput($input, $output);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Regex/PregMatchRemoveCaretTest.php b/tests/phpunit/Mutator/Regex/PregMatchRemoveCaretTest.php
index f571362049..01f73248a3 100644
--- a/tests/phpunit/Mutator/Regex/PregMatchRemoveCaretTest.php
+++ b/tests/phpunit/Mutator/Regex/PregMatchRemoveCaretTest.php
@@ -50,7 +50,7 @@ final class PregMatchRemoveCaretTest extends BaseMutatorTestCase
     #[DataProvider('provideMutationCases')]
     public function test_mutator($input, $expected = null): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function provideMutationCases(): Generator
diff --git a/tests/phpunit/Mutator/Regex/PregMatchRemoveDollarTest.php b/tests/phpunit/Mutator/Regex/PregMatchRemoveDollarTest.php
index 21697b77fb..bec46f89c6 100644
--- a/tests/phpunit/Mutator/Regex/PregMatchRemoveDollarTest.php
+++ b/tests/phpunit/Mutator/Regex/PregMatchRemoveDollarTest.php
@@ -50,7 +50,7 @@ final class PregMatchRemoveDollarTest extends BaseMutatorTestCase
     #[DataProvider('provideMutationCases')]
     public function test_mutator($input, $expected = null): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function provideMutationCases(): Generator
diff --git a/tests/phpunit/Mutator/Regex/PregMatchRemoveFlagsTest.php b/tests/phpunit/Mutator/Regex/PregMatchRemoveFlagsTest.php
index 40328075ac..d58a67d203 100644
--- a/tests/phpunit/Mutator/Regex/PregMatchRemoveFlagsTest.php
+++ b/tests/phpunit/Mutator/Regex/PregMatchRemoveFlagsTest.php
@@ -50,7 +50,7 @@ final class PregMatchRemoveFlagsTest extends BaseMutatorTestCase
     #[DataProvider('provideMutationCases')]
     public function test_mutator($input, $expected = null): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function provideMutationCases(): Generator
diff --git a/tests/phpunit/Mutator/Regex/PregQuoteTest.php b/tests/phpunit/Mutator/Regex/PregQuoteTest.php
index 3cd28422a1..81ccdbfbbd 100644
--- a/tests/phpunit/Mutator/Regex/PregQuoteTest.php
+++ b/tests/phpunit/Mutator/Regex/PregQuoteTest.php
@@ -49,7 +49,7 @@ final class PregQuoteTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Removal/ArrayItemRemovalTest.php b/tests/phpunit/Mutator/Removal/ArrayItemRemovalTest.php
index 5bea76ca23..bbf6f06916 100644
--- a/tests/phpunit/Mutator/Removal/ArrayItemRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/ArrayItemRemovalTest.php
@@ -53,7 +53,7 @@ final class ArrayItemRemovalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = [], array $settings = []): void
     {
-        $this->doTest($input, $expected, $settings);
+        $this->assertMutatesInput($input, $expected, $settings);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Removal/CatchBlockRemovalTest.php b/tests/phpunit/Mutator/Removal/CatchBlockRemovalTest.php
index 13fd2a532f..fc6614de99 100644
--- a/tests/phpunit/Mutator/Removal/CatchBlockRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/CatchBlockRemovalTest.php
@@ -49,7 +49,7 @@ final class CatchBlockRemovalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, array|string $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Removal/CloneRemovalTest.php b/tests/phpunit/Mutator/Removal/CloneRemovalTest.php
index bc2514b99e..5ee70b7177 100644
--- a/tests/phpunit/Mutator/Removal/CloneRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/CloneRemovalTest.php
@@ -49,7 +49,7 @@ final class CloneRemovalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Removal/ConcatOperandRemovalTest.php b/tests/phpunit/Mutator/Removal/ConcatOperandRemovalTest.php
index 03370d3659..1822c8ae3e 100644
--- a/tests/phpunit/Mutator/Removal/ConcatOperandRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/ConcatOperandRemovalTest.php
@@ -49,7 +49,7 @@ final class ConcatOperandRemovalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Removal/FunctionCallRemovalTest.php b/tests/phpunit/Mutator/Removal/FunctionCallRemovalTest.php
index fb6f0d1abf..bb3dac5232 100644
--- a/tests/phpunit/Mutator/Removal/FunctionCallRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/FunctionCallRemovalTest.php
@@ -49,7 +49,7 @@ final class FunctionCallRemovalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Removal/MatchArmRemovalTest.php b/tests/phpunit/Mutator/Removal/MatchArmRemovalTest.php
index 5eeb3757bf..50970c47d0 100644
--- a/tests/phpunit/Mutator/Removal/MatchArmRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/MatchArmRemovalTest.php
@@ -49,7 +49,7 @@ final class MatchArmRemovalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, array|string $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Removal/MethodCallRemovalTest.php b/tests/phpunit/Mutator/Removal/MethodCallRemovalTest.php
index 83a9c4b84e..128f8ba6f4 100644
--- a/tests/phpunit/Mutator/Removal/MethodCallRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/MethodCallRemovalTest.php
@@ -49,7 +49,7 @@ final class MethodCallRemovalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Removal/SharedCaseRemovalTest.php b/tests/phpunit/Mutator/Removal/SharedCaseRemovalTest.php
index da8987d9a7..eb44db8155 100644
--- a/tests/phpunit/Mutator/Removal/SharedCaseRemovalTest.php
+++ b/tests/phpunit/Mutator/Removal/SharedCaseRemovalTest.php
@@ -50,7 +50,7 @@ final class SharedCaseRemovalTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = [], array $settings = []): void
     {
-        $this->doTest($input, $expected, $settings);
+        $this->assertMutatesInput($input, $expected, $settings);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ReturnValue/ArrayOneItemTest.php b/tests/phpunit/Mutator/ReturnValue/ArrayOneItemTest.php
index 2abd79db4d..26b2eeac6f 100644
--- a/tests/phpunit/Mutator/ReturnValue/ArrayOneItemTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/ArrayOneItemTest.php
@@ -52,7 +52,7 @@ final class ArrayOneItemTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ReturnValue/FloatNegationTest.php b/tests/phpunit/Mutator/ReturnValue/FloatNegationTest.php
index 20c9850969..0c3755ce93 100644
--- a/tests/phpunit/Mutator/ReturnValue/FloatNegationTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/FloatNegationTest.php
@@ -49,7 +49,7 @@ final class FloatNegationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ReturnValue/FunctionCallTest.php b/tests/phpunit/Mutator/ReturnValue/FunctionCallTest.php
index 294269b69a..7afef1b130 100644
--- a/tests/phpunit/Mutator/ReturnValue/FunctionCallTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/FunctionCallTest.php
@@ -52,7 +52,7 @@ final class FunctionCallTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ReturnValue/IntegerNegationTest.php b/tests/phpunit/Mutator/ReturnValue/IntegerNegationTest.php
index 1a47318945..d57c1adf0c 100644
--- a/tests/phpunit/Mutator/ReturnValue/IntegerNegationTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/IntegerNegationTest.php
@@ -51,7 +51,7 @@ final class IntegerNegationTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ReturnValue/NewObjectTest.php b/tests/phpunit/Mutator/ReturnValue/NewObjectTest.php
index 308113f60e..4aa26590bd 100644
--- a/tests/phpunit/Mutator/ReturnValue/NewObjectTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/NewObjectTest.php
@@ -55,7 +55,7 @@ public function test_it_can_mutate(string $input, $expected = [], bool $allowed
         if (!$allowed) {
             $this->markTestSkipped($message);
         }
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ReturnValue/ThisTest.php b/tests/phpunit/Mutator/ReturnValue/ThisTest.php
index 602c2b7594..dde0af27c2 100644
--- a/tests/phpunit/Mutator/ReturnValue/ThisTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/ThisTest.php
@@ -52,7 +52,7 @@ final class ThisTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/ReturnValue/YieldValueTest.php b/tests/phpunit/Mutator/ReturnValue/YieldValueTest.php
index f7823a5bbe..3dd0c7a74f 100644
--- a/tests/phpunit/Mutator/ReturnValue/YieldValueTest.php
+++ b/tests/phpunit/Mutator/ReturnValue/YieldValueTest.php
@@ -49,7 +49,7 @@ final class YieldValueTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Sort/SpaceshipTest.php b/tests/phpunit/Mutator/Sort/SpaceshipTest.php
index e7a2399b12..2276922b38 100644
--- a/tests/phpunit/Mutator/Sort/SpaceshipTest.php
+++ b/tests/phpunit/Mutator/Sort/SpaceshipTest.php
@@ -54,7 +54,7 @@ public function test_get_name(): void
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/SyntaxErrorTest.php b/tests/phpunit/Mutator/SyntaxErrorTest.php
index f25726b306..bd49ed9590 100644
--- a/tests/phpunit/Mutator/SyntaxErrorTest.php
+++ b/tests/phpunit/Mutator/SyntaxErrorTest.php
@@ -49,7 +49,7 @@ final class SyntaxErrorTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected, [], true);
+        $this->assertMutatesInput($input, $expected, [], true);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayChangeKeyCaseTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayChangeKeyCaseTest.php
index ddb354c7ab..813ffb4bd4 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayChangeKeyCaseTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayChangeKeyCaseTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayChangeKeyCaseTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayChunkTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayChunkTest.php
index f6752e03bc..f2b62a9eb8 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayChunkTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayChunkTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayChunkTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayColumnTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayColumnTest.php
index 8d5d9b82a8..f8604896da 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayColumnTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayColumnTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayColumnTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayCombineTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayCombineTest.php
index 43bb64c4d9..3ab1915039 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayCombineTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayCombineTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayCombineTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffAssocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffAssocTest.php
index 855b8d19ff..6392d053cd 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffAssocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffAssocTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayDiffAssocTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffKeyTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffKeyTest.php
index fab79773b9..5837901bc6 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffKeyTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffKeyTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayDiffKeyTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffTest.php
index 19c15eab05..8b68e0e4f5 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayDiffTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUassocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUassocTest.php
index 20272965a4..3f2139e53d 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUassocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUassocTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayDiffUassocTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUkeyTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUkeyTest.php
index b3bb400a53..039d83d7d7 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUkeyTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayDiffUkeyTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayDiffUkeyTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayFilterTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayFilterTest.php
index c8f21d204f..a3908ef64f 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayFilterTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayFilterTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayFilterTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayFlipTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayFlipTest.php
index b8f784c414..647e1db70c 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayFlipTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayFlipTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayFlipTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectAssocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectAssocTest.php
index bfbd3a4fce..916dcc0d80 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectAssocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectAssocTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayIntersectAssocTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectKeyTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectKeyTest.php
index 54edfd2e72..8e22a01e4f 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectKeyTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectKeyTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayIntersectKeyTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectTest.php
index 75d2558b16..ecd0708d7b 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayIntersectTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUassocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUassocTest.php
index 85705903ac..afaa82ce58 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUassocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUassocTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayIntersectUassocTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUkeyTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUkeyTest.php
index 37637e2aa5..3ed132c133 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUkeyTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayIntersectUkeyTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayIntersectUkeyTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayKeysTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayKeysTest.php
index c0dc3ddbbf..9a58ef3e85 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayKeysTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayKeysTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayKeysTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMapTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMapTest.php
index 237961581d..14b59d071a 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMapTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMapTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayMapTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeRecursiveTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeRecursiveTest.php
index 387e4764b9..d3dba95f51 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeRecursiveTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeRecursiveTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayMergeRecursiveTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeTest.php
index d9fe31831c..903136e028 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayMergeTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayMergeTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayPadTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayPadTest.php
index 80a0a7ff28..8531458cc3 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayPadTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayPadTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayPadTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReduceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReduceTest.php
index ff22ecb825..ae7aa85691 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReduceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReduceTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayReduceTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceRecursiveTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceRecursiveTest.php
index 186f93db42..02b2153d94 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceRecursiveTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceRecursiveTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayReplaceRecursiveTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceTest.php
index bfb8e90b62..605ffad2f6 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReplaceTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayReplaceTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReverseTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReverseTest.php
index e5506acf29..85060a8596 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayReverseTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayReverseTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayReverseTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArraySliceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArraySliceTest.php
index 118caaa48c..d5209e8e3b 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArraySliceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArraySliceTest.php
@@ -49,7 +49,7 @@ final class UnwrapArraySliceTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArraySpliceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArraySpliceTest.php
index e78d47198f..c8d5eac45c 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArraySpliceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArraySpliceTest.php
@@ -49,7 +49,7 @@ final class UnwrapArraySpliceTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffAssocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffAssocTest.php
index fa3ac04cfa..f65486550d 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffAssocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffAssocTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayUdiffAssocTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffTest.php
index a120d0de4d..d27808c649 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayUdiffTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffUassocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffUassocTest.php
index cc21229cbc..f0f3ffe830 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffUassocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUdiffUassocTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayUdiffUassocTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectAssocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectAssocTest.php
index c5a7997965..62d1e5628f 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectAssocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectAssocTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayUintersectAssocTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectTest.php
index 62ac303962..da17f954ab 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayUintersectTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectUassocTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectUassocTest.php
index c1bc9bdb15..112d233180 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectUassocTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUintersectUassocTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayUintersectUassocTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUniqueTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUniqueTest.php
index 9629275a04..095bb7323a 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayUniqueTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayUniqueTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayUniqueTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapArrayValuesTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapArrayValuesTest.php
index 81e26552dc..bea8265247 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapArrayValuesTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapArrayValuesTest.php
@@ -49,7 +49,7 @@ final class UnwrapArrayValuesTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapFinallyTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapFinallyTest.php
index cabca0f87c..00a355db73 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapFinallyTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapFinallyTest.php
@@ -50,7 +50,7 @@ final class UnwrapFinallyTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, array|string $expected = [], array $settings = []): void
     {
-        $this->doTest($input, $expected, $settings);
+        $this->assertMutatesInput($input, $expected, $settings);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapLcFirstTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapLcFirstTest.php
index f83454a99d..574cf9b825 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapLcFirstTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapLcFirstTest.php
@@ -49,7 +49,7 @@ final class UnwrapLcFirstTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapLtrimTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapLtrimTest.php
index 75559c7e05..ae66138c2c 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapLtrimTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapLtrimTest.php
@@ -49,7 +49,7 @@ final class UnwrapLtrimTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapRtrimTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapRtrimTest.php
index c1edd6ccad..3168378cbc 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapRtrimTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapRtrimTest.php
@@ -49,7 +49,7 @@ final class UnwrapRtrimTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrIreplaceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrIreplaceTest.php
index 13b6a6038c..13be925fe4 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrIreplaceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrIreplaceTest.php
@@ -49,7 +49,7 @@ final class UnwrapStrIreplaceTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrRepeatTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrRepeatTest.php
index b2b28f4186..a124bf3ea3 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrRepeatTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrRepeatTest.php
@@ -49,7 +49,7 @@ final class UnwrapStrRepeatTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrReplaceTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrReplaceTest.php
index c34dbd0755..d3d6109b7b 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrReplaceTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrReplaceTest.php
@@ -49,7 +49,7 @@ final class UnwrapStrReplaceTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrRevTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrRevTest.php
index bada097e55..525150366d 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrRevTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrRevTest.php
@@ -49,7 +49,7 @@ final class UnwrapStrRevTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrShuffleTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrShuffleTest.php
index 20f58989ec..ea3211312b 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrShuffleTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrShuffleTest.php
@@ -49,7 +49,7 @@ final class UnwrapStrShuffleTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrToLowerTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrToLowerTest.php
index 11407633f5..5ce9fd70a2 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrToLowerTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrToLowerTest.php
@@ -49,7 +49,7 @@ final class UnwrapStrToLowerTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapStrToUpperTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapStrToUpperTest.php
index ee78c67984..57f0d563eb 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapStrToUpperTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapStrToUpperTest.php
@@ -49,7 +49,7 @@ final class UnwrapStrToUpperTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapSubstrTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapSubstrTest.php
index f5e68be8bf..710865f4c0 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapSubstrTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapSubstrTest.php
@@ -49,7 +49,7 @@ final class UnwrapSubstrTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapTrimTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapTrimTest.php
index 1e9fd41bb2..74515281ff 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapTrimTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapTrimTest.php
@@ -49,7 +49,7 @@ final class UnwrapTrimTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapUcFirstTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapUcFirstTest.php
index 2954ead0a1..ece851f668 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapUcFirstTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapUcFirstTest.php
@@ -49,7 +49,7 @@ final class UnwrapUcFirstTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable
diff --git a/tests/phpunit/Mutator/Unwrap/UnwrapUcWordsTest.php b/tests/phpunit/Mutator/Unwrap/UnwrapUcWordsTest.php
index ca3d7d8ace..b42581818f 100644
--- a/tests/phpunit/Mutator/Unwrap/UnwrapUcWordsTest.php
+++ b/tests/phpunit/Mutator/Unwrap/UnwrapUcWordsTest.php
@@ -49,7 +49,7 @@ final class UnwrapUcWordsTest extends BaseMutatorTestCase
     #[DataProvider('mutationsProvider')]
     public function test_it_can_mutate(string $input, $expected = []): void
     {
-        $this->doTest($input, $expected);
+        $this->assertMutatesInput($input, $expected);
     }
 
     public static function mutationsProvider(): iterable

From 2e9faf56363bdfc3a3050e89232f5aa93d337a54 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:20:00 +0200
Subject: [PATCH 18/25] Remove outdated TODOs

---
 src/Testing/BaseMutatorTestCase.php | 2 --
 1 file changed, 2 deletions(-)

diff --git a/src/Testing/BaseMutatorTestCase.php b/src/Testing/BaseMutatorTestCase.php
index 3ee07a9a7c..2d237c9904 100644
--- a/src/Testing/BaseMutatorTestCase.php
+++ b/src/Testing/BaseMutatorTestCase.php
@@ -59,7 +59,6 @@ abstract class BaseMutatorTestCase extends TestCase
 
     protected function setUp(): void
     {
-        // TODO: refactor this bit...
         $this->mutator = $this->createMutator();
     }
 
@@ -118,7 +117,6 @@ final protected function createMutator(array $settings = []): Mutator
         $isBuiltinMutator = array_key_exists($mutatorClassName, array_flip(ProfileList::ALL_MUTATORS));
         $mutatorName = $isBuiltinMutator ? MutatorName::getName($mutatorClassName) : $mutatorClassName;
 
-        // TODO: this is a bit ridicule...
         return SingletonContainer::getContainer()
             ->getMutatorFactory()
             ->create([

From fa8b489ca4303c5549a64eb330593d21aa493f14 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:21:24 +0200
Subject: [PATCH 19/25] Inline mutator node type

---
 src/Testing/SimpleMutation.php | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/src/Testing/SimpleMutation.php b/src/Testing/SimpleMutation.php
index bf53f77994..6099e19071 100644
--- a/src/Testing/SimpleMutation.php
+++ b/src/Testing/SimpleMutation.php
@@ -45,16 +45,13 @@
  */
 final class SimpleMutation extends Mutation
 {
-    /**
-     * @param MutatedNode $mutatedNode
-     */
     public function __construct(
         /**
          * @var Node[]
          */
         private readonly array $originalFileAst,
         private readonly Mutator $mutator,
-        private $mutatedNode,
+        private MutatedNode $mutatedNode,
         private readonly array $attributes,
         private readonly string $mutatedNodeClass,
     ) {

From 46777a080bca1eb177b8996f3212f8bc6871699a Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:31:11 +0200
Subject: [PATCH 20/25] Fix phpstan issues

---
 src/Command/CustomMutatorCommand.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/CustomMutatorCommand.php
index 98196bbb1f..087f0c52fa 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/CustomMutatorCommand.php
@@ -36,10 +36,10 @@
 namespace Infection\Command;
 
 use function basename;
-use function file_get_contents;
 use Infection\Console\IO;
 use RuntimeException;
 use function Safe\getcwd;
+use function Safe\file_get_contents;
 use function sprintf;
 use function str_replace;
 use Symfony\Component\Console\Input\InputArgument;

From a61768b3027add68ac24801a000a33b377d1c097 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 13:44:11 +0200
Subject: [PATCH 21/25] Rename command to `make:custom-mutator`

---
 ...ustomMutatorCommand.php => MakeCustomMutatorCommand.php} | 6 +++---
 src/Console/Application.php                                 | 4 ++--
 .../phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php  | 4 ++--
 3 files changed, 7 insertions(+), 7 deletions(-)
 rename src/Command/{CustomMutatorCommand.php => MakeCustomMutatorCommand.php} (97%)

diff --git a/src/Command/CustomMutatorCommand.php b/src/Command/MakeCustomMutatorCommand.php
similarity index 97%
rename from src/Command/CustomMutatorCommand.php
rename to src/Command/MakeCustomMutatorCommand.php
index 087f0c52fa..87391e2e0b 100644
--- a/src/Command/CustomMutatorCommand.php
+++ b/src/Command/MakeCustomMutatorCommand.php
@@ -38,8 +38,8 @@
 use function basename;
 use Infection\Console\IO;
 use RuntimeException;
-use function Safe\getcwd;
 use function Safe\file_get_contents;
+use function Safe\getcwd;
 use function sprintf;
 use function str_replace;
 use Symfony\Component\Console\Input\InputArgument;
@@ -50,12 +50,12 @@
 /**
  * @internal
  */
-final class CustomMutatorCommand extends BaseCommand
+final class MakeCustomMutatorCommand extends BaseCommand
 {
     protected function configure(): void
     {
         $this
-            ->setName('custom-mutator')
+            ->setName('make:custom-mutator')
             ->setDescription('Creates a custom mutator')
             ->addArgument('Mutator name', InputArgument::OPTIONAL);
     }
diff --git a/src/Console/Application.php b/src/Console/Application.php
index ae3d0f72b7..4b6f09e63c 100644
--- a/src/Console/Application.php
+++ b/src/Console/Application.php
@@ -39,8 +39,8 @@
 use function class_exists;
 use Composer\InstalledVersions;
 use Infection\Command\ConfigureCommand;
-use Infection\Command\CustomMutatorCommand;
 use Infection\Command\DescribeCommand;
+use Infection\Command\MakeCustomMutatorCommand;
 use Infection\Command\RunCommand;
 use Infection\Container;
 use OutOfBoundsException;
@@ -105,7 +105,7 @@ protected function getDefaultCommands(): array
                 new ConfigureCommand(),
                 new RunCommand(),
                 new DescribeCommand(),
-                new CustomMutatorCommand(),
+                new MakeCustomMutatorCommand(),
             ],
         );
 
diff --git a/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php b/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php
index 9b4b5cc2aa..79a8a796a0 100644
--- a/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php
+++ b/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php
@@ -41,7 +41,7 @@
 use function in_array;
 use Infection\CannotBeInstantiated;
 use Infection\Command\ConfigureCommand;
-use Infection\Command\CustomMutatorCommand;
+use Infection\Command\MakeCustomMutatorCommand;
 use Infection\Config\ConsoleHelper;
 use Infection\Config\Guesser\SourceDirGuesser;
 use Infection\Configuration\Schema\SchemaConfigurationFactory;
@@ -134,7 +134,7 @@ final class ProjectCodeProvider
         StringNormalizer::class,
         SourceTestClassNameScheme::class,
         SimpleMutationsCollectorVisitor::class,
-        CustomMutatorCommand::class,
+        MakeCustomMutatorCommand::class,
         SingletonContainer::class,
     ];
 

From 7c9afb1084b778bfb3beebc1f5546e1cc7dd4e86 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Sun, 26 May 2024 15:35:38 +0200
Subject: [PATCH 22/25] Create interact() method for new command, add tests

---
 devTools/phpstan-src-baseline.neon            |  10 +
 devTools/phpstan-tests.neon                   |   4 +
 src/Command/BaseCommand.php                   |   2 +-
 src/Command/MakeCustomMutatorCommand.php      |  35 +++-
 src/Testing/SimpleMutation.php                |   2 +-
 tests/phpunit/AutoReview/ContainerTest.php    |   1 +
 .../ProjectCode/ProjectCodeProvider.php       |   2 -
 .../Command/MakeCustomMutatorCommandTest.php  | 186 ++++++++++++++++++
 tests/phpunit/MockedContainer.php             |  49 +++++
 9 files changed, 277 insertions(+), 14 deletions(-)
 create mode 100644 tests/phpunit/Command/MakeCustomMutatorCommandTest.php
 create mode 100644 tests/phpunit/MockedContainer.php

diff --git a/devTools/phpstan-src-baseline.neon b/devTools/phpstan-src-baseline.neon
index be32229310..1a8e934031 100644
--- a/devTools/phpstan-src-baseline.neon
+++ b/devTools/phpstan-src-baseline.neon
@@ -1,5 +1,15 @@
 parameters:
 	ignoreErrors:
+		-
+			message: "#^Anonymous function should return string but returns string\\|null\\.$#"
+			count: 1
+			path: ../src/Command/MakeCustomMutatorCommand.php
+
+		-
+			message: "#^Cannot call method askQuestion\\(\\) on Infection\\\\Console\\\\IO\\|null\\.$#"
+			count: 1
+			path: ../src/Command/MakeCustomMutatorCommand.php
+
 		-
 			message: "#^Parameter \\#1 \\$array of static method Webmozart\\\\Assert\\\\Assert\\:\\:keyExists\\(\\) expects array, iterable\\<\\(int\\|string\\), string\\>\\|null given\\.$#"
 			count: 2
diff --git a/devTools/phpstan-tests.neon b/devTools/phpstan-tests.neon
index d95b6656b3..6b5a9a18fc 100644
--- a/devTools/phpstan-tests.neon
+++ b/devTools/phpstan-tests.neon
@@ -42,6 +42,10 @@ parameters:
             message: "#^Instantiated class Infection\\\\Tests\\\\Fixtures\\\\Console\\\\FakeOutput not found\\.$#"
             count: 11
             path:  ../tests/*
+        -
+            message: "#^PHPDoc tag @param for parameter \\$values contains unresolvable type\\.$#"
+            count: 1
+            path: ../tests/phpunit/MockedContainer.php
     level: 4
     paths:
         - ../tests/phpunit
diff --git a/src/Command/BaseCommand.php b/src/Command/BaseCommand.php
index a26d3f975e..74f41bceae 100644
--- a/src/Command/BaseCommand.php
+++ b/src/Command/BaseCommand.php
@@ -47,7 +47,7 @@
  */
 abstract class BaseCommand extends Command
 {
-    private ?IO $io = null;
+    protected ?IO $io = null;
 
     final public function getApplication(): Application
     {
diff --git a/src/Command/MakeCustomMutatorCommand.php b/src/Command/MakeCustomMutatorCommand.php
index 87391e2e0b..159c031009 100644
--- a/src/Command/MakeCustomMutatorCommand.php
+++ b/src/Command/MakeCustomMutatorCommand.php
@@ -43,6 +43,8 @@
 use function sprintf;
 use function str_replace;
 use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Question\Question;
 use function trim;
 use function ucfirst;
@@ -52,23 +54,30 @@
  */
 final class MakeCustomMutatorCommand extends BaseCommand
 {
+    private const MUTATOT_NAME_ARGUMENT = 'Mutator name';
+
     protected function configure(): void
     {
         $this
             ->setName('make:custom-mutator')
             ->setDescription('Creates a custom mutator')
-            ->addArgument('Mutator name', InputArgument::OPTIONAL);
+            ->addArgument(self::MUTATOT_NAME_ARGUMENT, InputArgument::REQUIRED);
     }
 
-    protected function executeCommand(IO $io): bool
+    protected function interact(InputInterface $input, OutputInterface $output): void
     {
-        $mutatorName = $io->getInput()->getArgument('Mutator name');
+        $mutatorName = $input->getArgument(self::MUTATOT_NAME_ARGUMENT);
+
+        if ($this->mutatorNameIsEmpty($mutatorName)) {
+            $mutatorName = $this->askMutatorName();
 
-        if ($mutatorName === null) {
-            $mutatorName = $this->askMutatorName($io);
+            $input->setArgument(self::MUTATOT_NAME_ARGUMENT, $mutatorName);
         }
+    }
 
-        $mutatorName = ucfirst((string) $mutatorName);
+    protected function executeCommand(IO $io): bool
+    {
+        $mutatorName = ucfirst(trim((string) $io->getInput()->getArgument(self::MUTATOT_NAME_ARGUMENT)));
 
         $templateFilePaths = [
             __DIR__ . '/../CustomMutator/templates/__Name__.php',
@@ -91,22 +100,28 @@ private static function replaceNameVariable(string $rectorName, string $contents
         return str_replace('__Name__', $rectorName, $contents);
     }
 
-    private function askMutatorName(IO $io): mixed
+    private function askMutatorName(): mixed
     {
         $question = new Question('What mutator do you wish to create (e.g. `AnyStringToInfectedMutator`)?');
-        $question->setValidator(static function (?string $answer): string {
-            if ($answer === null || trim($answer) === '') {
+
+        $question->setValidator(function (?string $answer): string {
+            if ($this->mutatorNameIsEmpty($answer)) {
                 throw new RuntimeException('Mutator name is mandatory.');
             }
 
             return $answer;
         });
 
-        return $io->askQuestion(
+        return $this->io->askQuestion(
             $question,
         );
     }
 
+    private function mutatorNameIsEmpty(?string $mutatorName): bool
+    {
+        return $mutatorName === null || trim($mutatorName) === '';
+    }
+
     /**
      * @param list<string> $filePaths
      * @return list<string>
diff --git a/src/Testing/SimpleMutation.php b/src/Testing/SimpleMutation.php
index 6099e19071..7ff71c8d12 100644
--- a/src/Testing/SimpleMutation.php
+++ b/src/Testing/SimpleMutation.php
@@ -51,7 +51,7 @@ public function __construct(
          */
         private readonly array $originalFileAst,
         private readonly Mutator $mutator,
-        private MutatedNode $mutatedNode,
+        private readonly MutatedNode $mutatedNode,
         private readonly array $attributes,
         private readonly string $mutatedNodeClass,
     ) {
diff --git a/tests/phpunit/AutoReview/ContainerTest.php b/tests/phpunit/AutoReview/ContainerTest.php
index 39161dd3ad..61d5751f82 100644
--- a/tests/phpunit/AutoReview/ContainerTest.php
+++ b/tests/phpunit/AutoReview/ContainerTest.php
@@ -99,6 +99,7 @@ public function getContainerFiles(): array
                 __DIR__ . '/ContainerTest.php',
                 __DIR__ . '/../ContainerTest.php',
                 __DIR__ . '/../SingletonContainer.php',
+                __DIR__ . '/../MockedContainer.php',
             ],
         );
 
diff --git a/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php b/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php
index 79a8a796a0..026c982eb5 100644
--- a/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php
+++ b/tests/phpunit/AutoReview/ProjectCode/ProjectCodeProvider.php
@@ -41,7 +41,6 @@
 use function in_array;
 use Infection\CannotBeInstantiated;
 use Infection\Command\ConfigureCommand;
-use Infection\Command\MakeCustomMutatorCommand;
 use Infection\Config\ConsoleHelper;
 use Infection\Config\Guesser\SourceDirGuesser;
 use Infection\Configuration\Schema\SchemaConfigurationFactory;
@@ -134,7 +133,6 @@ final class ProjectCodeProvider
         StringNormalizer::class,
         SourceTestClassNameScheme::class,
         SimpleMutationsCollectorVisitor::class,
-        MakeCustomMutatorCommand::class,
         SingletonContainer::class,
     ];
 
diff --git a/tests/phpunit/Command/MakeCustomMutatorCommandTest.php b/tests/phpunit/Command/MakeCustomMutatorCommandTest.php
new file mode 100644
index 0000000000..3ff7af88ab
--- /dev/null
+++ b/tests/phpunit/Command/MakeCustomMutatorCommandTest.php
@@ -0,0 +1,186 @@
+<?php
+/**
+ * This code is licensed under the BSD 3-Clause License.
+ *
+ * Copyright (c) 2017, Maks Rafalko
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * * Neither the name of the copyright holder nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+declare(strict_types=1);
+
+namespace Infection\Tests\Command;
+
+use Infection\Command\MakeCustomMutatorCommand;
+use Infection\Console\Application;
+use Infection\Tests\MockedContainer;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Group;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Tester\CommandTester;
+use Symfony\Component\Filesystem\Filesystem;
+
+#[Group('integration')]
+#[CoversClass(MakeCustomMutatorCommand::class)]
+final class MakeCustomMutatorCommandTest extends TestCase
+{
+    public function test_it_create_custom_mutator_when_name_is_provided(): void
+    {
+        $app = new Application($this->createContainer());
+
+        $tester = new CommandTester($app->find('make:custom-mutator'));
+
+        $result = $tester->execute([
+            'Mutator name' => 'CustomMutator',
+        ]);
+        $this->assertSame(0, $result);
+
+        $display = $tester->getDisplay();
+
+        $this->assertStringContainsString('Generated files', $display);
+        $this->assertStringContainsString('CustomMutator.php', $display);
+        $this->assertStringContainsString('CustomMutatorTest.php', $display);
+    }
+
+    public function test_it_create_custom_mutator_when_name_is_not_provided_at_command_call(): void
+    {
+        $app = new Application($this->createContainer());
+
+        $tester = new CommandTester($app->find('make:custom-mutator'));
+
+        $tester->setInputs(['NewMutator']);
+
+        $result = $tester->execute([]);
+
+        $this->assertSame(0, $result);
+
+        $display = $tester->getDisplay();
+
+        $this->assertStringContainsString('Generated files', $display);
+        $this->assertStringContainsString('NewMutator.php', $display);
+        $this->assertStringContainsString('NewMutator.php', $display);
+    }
+
+    public function test_it_trims_the_argument_value(): void
+    {
+        $app = new Application($this->createContainer());
+
+        $tester = new CommandTester($app->find('make:custom-mutator'));
+
+        $result = $tester->execute([
+            'Mutator name' => ' CustomMutator ',
+        ]);
+        $this->assertSame(0, $result);
+
+        $display = $tester->getDisplay();
+
+        $this->assertStringContainsString('Generated files', $display);
+        $this->assertStringContainsString('CustomMutator.php', $display);
+        $this->assertStringContainsString('CustomMutatorTest.php', $display);
+    }
+
+    public function test_it_trims_the_value_from_quetion_helper(): void
+    {
+        $app = new Application($this->createContainer());
+
+        $tester = new CommandTester($app->find('make:custom-mutator'));
+
+        $tester->setInputs([' NewMutator ']);
+
+        $result = $tester->execute([]);
+
+        $this->assertSame(0, $result);
+
+        $display = $tester->getDisplay();
+
+        $this->assertStringContainsString('Generated files', $display);
+        $this->assertStringContainsString('NewMutator.php', $display);
+        $this->assertStringContainsString('NewMutator.php', $display);
+    }
+
+    public function test_it_uppercases_first_letter_of_argument_value(): void
+    {
+        $app = new Application($this->createContainer());
+
+        $tester = new CommandTester($app->find('make:custom-mutator'));
+
+        $result = $tester->execute([
+            'Mutator name' => ' customMutator ',
+        ]);
+        $this->assertSame(0, $result);
+
+        $display = $tester->getDisplay();
+
+        $this->assertStringContainsString('Generated files', $display);
+        $this->assertStringContainsString('CustomMutator.php', $display);
+        $this->assertStringContainsString('CustomMutatorTest.php', $display);
+    }
+
+    public function test_uppercases_the_value_from_quetion_helper(): void
+    {
+        $app = new Application($this->createContainer());
+
+        $tester = new CommandTester($app->find('make:custom-mutator'));
+
+        $tester->setInputs([' newMutator ']);
+
+        $result = $tester->execute([]);
+
+        $this->assertSame(0, $result);
+
+        $display = $tester->getDisplay();
+
+        $this->assertStringContainsString('Generated files', $display);
+        $this->assertStringContainsString('NewMutator.php', $display);
+        $this->assertStringContainsString('NewMutator.php', $display);
+    }
+
+    private function createFileSystemMock(): MockObject
+    {
+        /**
+         * @var Filesystem|MockObject
+         */
+        $fileSystemMock = $this->createMock(Filesystem::class);
+
+        $fileSystemMock
+            ->expects($this->exactly(2))
+            ->method('dumpFile')
+        ;
+
+        return $fileSystemMock;
+    }
+
+    private function createContainer()
+    {
+        $container = MockedContainer::createWithServices([
+            Filesystem::class => fn () => $this->createFileSystemMock(),
+        ]);
+
+        return $container;
+    }
+}
diff --git a/tests/phpunit/MockedContainer.php b/tests/phpunit/MockedContainer.php
new file mode 100644
index 0000000000..852d7bccb0
--- /dev/null
+++ b/tests/phpunit/MockedContainer.php
@@ -0,0 +1,49 @@
+<?php
+/**
+ * This code is licensed under the BSD 3-Clause License.
+ *
+ * Copyright (c) 2017, Maks Rafalko
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ *
+ * * Neither the name of the copyright holder nor the names of its
+ *   contributors may be used to endorse or promote products derived from
+ *   this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+declare(strict_types=1);
+
+namespace Infection\Tests;
+
+use Infection\Container;
+
+final class MockedContainer
+{
+    /**
+     * @param array<class-string<object>, Closure(Container): object> $values
+     */
+    public static function createWithServices(array $values): Container
+    {
+        return new Container($values);
+    }
+}

From ebb0ca8a62468b05d53fa0b0de3f4b519d3f359c Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Mon, 27 May 2024 18:40:40 +0200
Subject: [PATCH 23/25] Rename command to `make:mutator`

---
 src/Command/MakeCustomMutatorCommand.php             |  2 +-
 .../phpunit/Command/MakeCustomMutatorCommandTest.php | 12 ++++++------
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/Command/MakeCustomMutatorCommand.php b/src/Command/MakeCustomMutatorCommand.php
index 159c031009..67b8e02f1c 100644
--- a/src/Command/MakeCustomMutatorCommand.php
+++ b/src/Command/MakeCustomMutatorCommand.php
@@ -59,7 +59,7 @@ final class MakeCustomMutatorCommand extends BaseCommand
     protected function configure(): void
     {
         $this
-            ->setName('make:custom-mutator')
+            ->setName('make:mutator')
             ->setDescription('Creates a custom mutator')
             ->addArgument(self::MUTATOT_NAME_ARGUMENT, InputArgument::REQUIRED);
     }
diff --git a/tests/phpunit/Command/MakeCustomMutatorCommandTest.php b/tests/phpunit/Command/MakeCustomMutatorCommandTest.php
index 3ff7af88ab..9469dd6ed6 100644
--- a/tests/phpunit/Command/MakeCustomMutatorCommandTest.php
+++ b/tests/phpunit/Command/MakeCustomMutatorCommandTest.php
@@ -53,7 +53,7 @@ public function test_it_create_custom_mutator_when_name_is_provided(): void
     {
         $app = new Application($this->createContainer());
 
-        $tester = new CommandTester($app->find('make:custom-mutator'));
+        $tester = new CommandTester($app->find('make:mutator'));
 
         $result = $tester->execute([
             'Mutator name' => 'CustomMutator',
@@ -71,7 +71,7 @@ public function test_it_create_custom_mutator_when_name_is_not_provided_at_comma
     {
         $app = new Application($this->createContainer());
 
-        $tester = new CommandTester($app->find('make:custom-mutator'));
+        $tester = new CommandTester($app->find('make:mutator'));
 
         $tester->setInputs(['NewMutator']);
 
@@ -90,7 +90,7 @@ public function test_it_trims_the_argument_value(): void
     {
         $app = new Application($this->createContainer());
 
-        $tester = new CommandTester($app->find('make:custom-mutator'));
+        $tester = new CommandTester($app->find('make:mutator'));
 
         $result = $tester->execute([
             'Mutator name' => ' CustomMutator ',
@@ -108,7 +108,7 @@ public function test_it_trims_the_value_from_quetion_helper(): void
     {
         $app = new Application($this->createContainer());
 
-        $tester = new CommandTester($app->find('make:custom-mutator'));
+        $tester = new CommandTester($app->find('make:mutator'));
 
         $tester->setInputs([' NewMutator ']);
 
@@ -127,7 +127,7 @@ public function test_it_uppercases_first_letter_of_argument_value(): void
     {
         $app = new Application($this->createContainer());
 
-        $tester = new CommandTester($app->find('make:custom-mutator'));
+        $tester = new CommandTester($app->find('make:mutator'));
 
         $result = $tester->execute([
             'Mutator name' => ' customMutator ',
@@ -145,7 +145,7 @@ public function test_uppercases_the_value_from_quetion_helper(): void
     {
         $app = new Application($this->createContainer());
 
-        $tester = new CommandTester($app->find('make:custom-mutator'));
+        $tester = new CommandTester($app->find('make:mutator'));
 
         $tester->setInputs([' newMutator ']);
 

From 972ec627c1399a01791d55531238d621d77b95f3 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Mon, 27 May 2024 18:41:08 +0200
Subject: [PATCH 24/25] Fix typo

---
 src/Command/MakeCustomMutatorCommand.php | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/Command/MakeCustomMutatorCommand.php b/src/Command/MakeCustomMutatorCommand.php
index 67b8e02f1c..9debaf1c34 100644
--- a/src/Command/MakeCustomMutatorCommand.php
+++ b/src/Command/MakeCustomMutatorCommand.php
@@ -54,30 +54,30 @@
  */
 final class MakeCustomMutatorCommand extends BaseCommand
 {
-    private const MUTATOT_NAME_ARGUMENT = 'Mutator name';
+    private const MUTATOR_NAME_ARGUMENT = 'Mutator name';
 
     protected function configure(): void
     {
         $this
             ->setName('make:mutator')
             ->setDescription('Creates a custom mutator')
-            ->addArgument(self::MUTATOT_NAME_ARGUMENT, InputArgument::REQUIRED);
+            ->addArgument(self::MUTATOR_NAME_ARGUMENT, InputArgument::REQUIRED);
     }
 
     protected function interact(InputInterface $input, OutputInterface $output): void
     {
-        $mutatorName = $input->getArgument(self::MUTATOT_NAME_ARGUMENT);
+        $mutatorName = $input->getArgument(self::MUTATOR_NAME_ARGUMENT);
 
         if ($this->mutatorNameIsEmpty($mutatorName)) {
             $mutatorName = $this->askMutatorName();
 
-            $input->setArgument(self::MUTATOT_NAME_ARGUMENT, $mutatorName);
+            $input->setArgument(self::MUTATOR_NAME_ARGUMENT, $mutatorName);
         }
     }
 
     protected function executeCommand(IO $io): bool
     {
-        $mutatorName = ucfirst(trim((string) $io->getInput()->getArgument(self::MUTATOT_NAME_ARGUMENT)));
+        $mutatorName = ucfirst(trim((string) $io->getInput()->getArgument(self::MUTATOR_NAME_ARGUMENT)));
 
         $templateFilePaths = [
             __DIR__ . '/../CustomMutator/templates/__Name__.php',

From 7d3fdacd19acbe736dc3874f3735d83112d397e3 Mon Sep 17 00:00:00 2001
From: maks-rafalko <b0rn@list.ru>
Date: Tue, 28 May 2024 00:22:06 +0200
Subject: [PATCH 25/25] Allow custom mutator to be used in `--mutators=X,Y,Z`
 option

---
 src/Mutator/MutatorParser.php               |  4 ++++
 tests/e2e/Custom_Mutator/composer.json      |  5 +++++
 tests/phpunit/Mutator/MutatorParserTest.php | 16 ++++++++++++----
 3 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/src/Mutator/MutatorParser.php b/src/Mutator/MutatorParser.php
index b95ce2e67a..1ad241c54f 100644
--- a/src/Mutator/MutatorParser.php
+++ b/src/Mutator/MutatorParser.php
@@ -86,6 +86,10 @@ public function parse(string $unparsedMutators): array
                 continue;
             }
 
+            if (MutatorResolver::isValidMutator($profileOrMutator)) {
+                continue;
+            }
+
             throw new UnexpectedValueException(
                 sprintf(
                     'Expected "%s" to be a known mutator or profile. See "%s" and "%s" for '
diff --git a/tests/e2e/Custom_Mutator/composer.json b/tests/e2e/Custom_Mutator/composer.json
index 10920f6ee8..05c06e4371 100644
--- a/tests/e2e/Custom_Mutator/composer.json
+++ b/tests/e2e/Custom_Mutator/composer.json
@@ -14,5 +14,10 @@
     },
     "require": {
         "infection/mutator": "^0.4.0"
+    },
+    "config": {
+        "allow-plugins": {
+            "infection/extension-installer": true
+        }
     }
 }
diff --git a/tests/phpunit/Mutator/MutatorParserTest.php b/tests/phpunit/Mutator/MutatorParserTest.php
index 02d2d613d9..63ba30a936 100644
--- a/tests/phpunit/Mutator/MutatorParserTest.php
+++ b/tests/phpunit/Mutator/MutatorParserTest.php
@@ -36,6 +36,7 @@
 namespace Infection\Tests\Mutator;
 
 use Infection\Mutator\MutatorParser;
+use Infection\Tests\Fixtures\Mutator\FakeMutator;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\TestCase;
@@ -43,10 +44,7 @@
 #[CoversClass(MutatorParser::class)]
 final class MutatorParserTest extends TestCase
 {
-    /**
-     * @var MutatorParser
-     */
-    private $mutatorParser;
+    private MutatorParser $mutatorParser;
 
     protected function setUp(): void
     {
@@ -99,5 +97,15 @@ public static function mutatorInputProvider(): iterable
                 '@boolean',
             ],
         ];
+
+        yield 'custom mutator class' => [
+            'Minus,@boolean,Infection\\Tests\\Fixtures\\Mutator\\FakeMutator,Minus',
+            [
+                'Minus',
+                '@boolean',
+                FakeMutator::class,
+                'Minus',
+            ],
+        ];
     }
 }