After three years of working on some software (basically some fancy shell scripting but in Python), when the project had grown dramatically beyond its original

After three years of working on some software (basically some fancy shell scripting but in Python), when the project had grown dramatically beyond its original scope through a host of hacks and bolted-on features, I remembered that the software had unit tests and ran them. Surprisingly, all the unit tests passed, and my first thought when I saw that was "Man, I bet these unit tests are awful."