In general, the people who write and/or design the code are the ones who knows how to best test the code. These are the people who have thought most deeply abou

In general, the people who write and/or design the code are the ones who knows how to best test the code. These are the people who have thought most deeply about the code that is written, not only in the code itself but also how it fits in the larger context. Good QA is hard to find, and in general are underpaid. In my opinion, good QA is like good security researchers. They know how to break the system. These people are invaluable. As a developer, you should want to write tests and encourage people on your team to love it. Good tests let you sleep at night and enjoy your weekends. If you perception is that "writing these tests are a waste of my time", I think that's actually not in your best interest.