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The majority of those tests weren't actually unit tests at all. Sure, they all extended JUnit TestCase, but most of them did some sort of file I/O, many included calls to Thread.sleep(), and during their execution there would be about 20-30 AWT windows popping up and flashing stuff in my face. As a matter of fact, they were system tests masquerading as unit test.
Exercises in Frustration
To be continued...