I think there are times where it's ok to treat a function like a black box--cases where anything that makes the test pass will do because the test is in fact an

I think there are times where it's ok to treat a function like a black box--cases where anything that makes the test pass will do because the test is in fact an exhaustive evaluation of what that code needs to do. We just need to be better about making it clear which code is that way and which is not.