Some of the reasons why I delete unit tests from time to time: - Often the quality of unit test code is a lot worse than the production code. - Some times peo

Some of the reasons why I delete unit tests from time to time: - Often the quality of unit test code is a lot worse than the production code. - Some times people test too much in a single test (ie. more than one unit) making it very hard to change the design of the application. - Some times a unit test misunderstands how the application is supposed to work or the requirements change. - Some times a unit test tests something too little or too trivial. - Some other test is already covering the case. I personally don't weight 100% test coverage as critical. Often other aspects of QA in application development are more important (i.e. integration test or documentation).