How do I test software in a really good way? [closed]

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It's hard. I don't know where to start, do I use JUnit or a library for PHP?

The problem 开发者_如何学运维is I keep testing things and it works out really bad. Shall I give you a code example?

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Software testing is only as good as the known defects that you discover. I recommend unit, functional, and regression testing while relying on a continuous integration tool. This will allow changes to be propagated and tested as soon as possible.