Test Module - A test module that allows accounts that are not related to the Safe to withdraw a predetermined amount of a specific token using EIP-712 signature issued by the Safe owner.
This design is unsafe! In the "Solidity Challenge" document I received via email it is stated, that "Now they can generate a signature which allows ANYONE to withdraw Unicorn tokens from their Safe."
To allow ANYONE use the signature, there should be no spender address in the Allowance.
With this design the signature can be picked up from mempool and the transaction can be frontrunned.
Better way to implement this module would be with specifiyng the spender for each Allowance,
so the allowance can only be used by a spender specified by a Safe owner when signing the data hash.
Thus frontrunning will not be an issue.