I'm big on unit testing. The unit test becomes the regression test after a change is made. If someone reports a problem and it gets down to a small code sample, I add that to the unit test before fixing it.
Somehow I doubt that his existing code has unit test code with it. So just what is it supposed to do? Mudding the difference between what it's defined to do vs what it just happens to do is one of my pet issues, too.
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