In QA I have found a code review to be very helpful in identifying test cases. Often I'll think I've covered every edge case I can think of, but once I've read

In QA I have found a code review to be very helpful in identifying test cases. Often I'll think I've covered every edge case I can think of, but once I've read through the code I identify the implementation can fail in a certin scenario I hadn't considered. This is why I think Black Box testing is a bad approach unless something about the circumstance specifically calls for it. I do think it's better to have a test plan first, then supplement it with code review, just to not get overly biased.