The worst is when you expect an existing test to fail, but it passes, and it turns out the test wasn’t actually properly testing the code. Fixing the test finds a bunch of broken edge cases.
Then you ask questions about what the past person could possibly have been thinking. You wonder what logic path brought them to create the code this way. You check git blame. It was you.
My favourite is always;
Lemme quickly write this test, it passes great, if I make this little change it’ll fail. It’s still passing, damn.
The worst is when you expect an existing test to fail, but it passes, and it turns out the test wasn’t actually properly testing the code. Fixing the test finds a bunch of broken edge cases.
Then you ask questions about what the past person could possibly have been thinking. You wonder what logic path brought them to create the code this way. You check git blame. It was you.
Debugging. It’s a whodunnit where the victim, murderer, and investigator are all you.^(apologies to Filipe Fortes)