This is more, did I accidentally break something? The correctness of the tests is not known but you will know which tests have changed. Then you can go and rev

This is more, did I accidentally break something? The correctness of the tests is not known but you will know which tests have changed. Then you can go and review that code and see why it changed and whether the new behavior is correct. This gives you confidence in a change didn’t break anything but not that things weren’t broken from the start.