Differential Coverage for Debugging Posted on Friday, April 25, 2025. I have been debugging some code I did not write and was reminded of this technique. I’m sure it’s a very old debugging technique (like bisection), but it should be more widely known. Suppose you have one test case that’s failing. You can get a sense of what code might be involved by comparing the code coverage of successful tests with the code coverage of the failing test. For example, I’ve inserted a bug into my development c...