Nope. With experience comes wisdom. I've had the situation happen when I was sure I knew what the bug was. I wrote a test that I expected to fail—and it passed.

Nope. With experience comes wisdom. I've had the situation happen when I was sure I knew what the bug was. I wrote a test that I expected to fail—and it passed. My diagnosis was incorrect and the bug was somewhere else. Had I not done this, I might have not only not fixed the bug, I would have likely introduced new bugs.