It seems to me that someone with this philosophy has never tried to change or refactor a subsystem of a very complicated legacy project. Sure, sometimes your te

It seems to me that someone with this philosophy has never tried to change or refactor a subsystem of a very complicated legacy project. Sure, sometimes your tests fail because they're poorly written and test implementation details, but other times they catch the fact that you didn't know about case X that had been discovered years ago and required a minor non-obvious tweak in the code to make work correctly.