Epic Fail!
At this point, you are probably thinking that a good test is a passing test. Test failures are bad, right? They mean something is broken, and broken is bad. I would argue that you always want your tests to fail before they pass. When I first started writing unit tests, I was really enjoying myself. I loved all those green checkmarks indicating that all my tests were passing. I was pretty proud of myself. I started sharing my code and test code with the other programmers I worked with. Soon, though, I discovered through manual testing that my application code had a really serious bug. My unit tests were supposed to be testing for that bug, but for some reason, the tests were still passing. It turns out that I had written my tests so ...
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