I'm being a little rhetorically over the top. Of course, sometimes it's what you have to do.

In fact, right now I'm doing exactly Test/Implement because I don't know how else to solve the problem. But this is a last resort. Only because the first few attempts failed and I must solve this problem have I resorted to grinding out individual cases. The issue is that I have my back against the wall and have to solve a problem I don't understand. But as I progress, eventually I will understand the problem, and then my many cases are going to get dramatically simplified or even rewritten.

But all the tests I've created along the way will stay...