On the contrary. Unit testing is exactly for exposing that sort of thing. (Actually, I see more problems with cute off-by-one bugs than null pointers per se, bu

On the contrary. Unit testing is exactly for exposing that sort of thing. (Actually, I see more problems with cute off-by-one bugs than null pointers per se, but still.) They should not be thrown away. There are ways to do it and ways not to do it, though. A good framework should be exhaustively unit tested. Individual components that use that framework should be lightly unit-tested (rather than having the framework heavily mocked) and more attention should be spent on integration/acceptance tests.