Wow, but how did they deal with anomalies ?

I mean, even when I have the codebase readily accessible and testable in front of my eyes, I never trust the tests to be enough ? I often spot forgotten edge cases and bugs of various sort in C/embedded projects BECAUSE I run the program, can debug and spot mem issues and whole a lot of other things for which you NEED to gather the most informations you can in order to find solutions ?