If you want to change what a function does, you have to change all the tests you wrote for it. This guy doesn't know how to write good tests at all. The whole

If you want to change what a function does, you have to change all the tests you wrote for it. This guy doesn't know how to write good tests at all. The whole point of testing is that you can change those function without any fear of breaking anything because the tests will prove it works the same way as before.