I recently started to use automated tests for everything and it is really great to not worry about every little change anymore.
But I think I'm not very good at it. The tests themselves are quite slow and I'm not sure if I'm covering everything the right way. Also, I'm very slow at writing the test cases.
SO I want to learn more about it. Do you have any recommended books on this topic? Anything about unit or feature tests and TDD, language specific (PHP) or general is appreciated