EXPERIMENTAL! Beware; there be dragons!
npm install --save-dev gobble-mocha
var src = gobble( 'src' );
var unitTests = gobble([
src.moveTo( 'src' ),
gobble( 'unit-tests' ).moveTo( 'tests' )
])
.observe( 'mocha' );
// build the app
var app = src
.transform( 'rollup', {
entry: 'app.js',
format: 'iife'
});
module.exports = gobble([ unitTests, app ]);