Choose a testing framework

[garrettw]

• PHPUnit - the old tried-and-true stalwart
• PhpSpec - the BDD version of PHPUnit (I've long preferred it)
• Codeception - an all-in-one framework that supports unit tests, integration tests, and functional tests (if I remembered that correctly)
• Pest - the new hotness because it's tied to Laravel

I would probably be ok with any of the last 3. I've never tried Pest, and in my limited experience with Codeception (since it has integrations with the Yii framework, which I've used) I ran into some difficulties that I wasn't sure how to solve -- but that was a different project with a different configuration. PhpSpec has been rather straight-foward and easy when I've used it before.

I would also like to use Infection - a mutation-testing framework. Basically it fuzzes all your data inputs with all kinds of data to see what happens when your app gets something it doesn't expect.