in my opinion, writing unit tests is overrated.

i think some developers put too much stock in unit testing and it gives them (and their managers, customers, and co-workers) a false sense of security. they end up wasting time and not really preventing as many bugs as they think it will. application logic changes and they have to write twice as much code to change the application and all of the tests that depended on that logic.

writing a regression test for a complicated routine or library is one thing, but writing a test for every method of a class just for the warm fuzzy of their test framework telling them they have 100% coverage is silly.