It seems along the lines of exploratory coding to build a suite of tests so that as your ripping things apart to build back up you have some assurance that you're not destroying the functionality somewhere else. I found myself this weekend hand testing 6 or so different scenarios through asv to make sure my changes weren't having unintended consequences. Besides being a waste of time, I have to wonder if the next person to change the srv will remember to test all the scenarios - even if the next person is me.