That's my experience, too. Coverage isn't a good proxy for test quality, for sure, but it's a good proxy for having looked carefully at every line. I think cove

That's my experience, too. Coverage isn't a good proxy for test quality, for sure, but it's a good proxy for having looked carefully at every line. I think coverage testing is useful as long as you're prepared to throw those tests away when you refactor, or at least ignore them during refactoring.