If you had asked me like three days ago, I would have been like "I don't know why I was so worried about TDD, it's great nothing goes wrong, it goes smoothly and logically!" and if you ask me right now, I'll swear I saw this coming.
Saw what coming? Well, all my tests pass. . .
I was given the task of building a Tic-Tac-Toe game with TDD, and I was totally game. Testing is one of the things I feel like I need the most practice in, and I'd never done anything fully TDD before (fun fact: I still haven't).
At some point, I was going through my red/green/refactor pattern and everything was going well enough except I kind of went a bit overboard and one of the refactors I ended up with was more of a dumpsterfire than an actual function. But all my tests were passing, so it may not have been a great refactor, but I could move forward assured that my dumpsterfire was contained in its dumpster.
The way I understand TDD is you don't write functionality until you write the tests for it, so yes, my refactored Tic-Tac-Toe code was only going to work for a traditional 3x3 board, but broadening its functionality without writing the tests first wasn't part of the plan, and the plan didn't technically include expanding the board yet, so I left it alone.
Later, however, when I was trying to write a different piece of code that used those functions, things were going horribly wrong. It wasn't until I started breaking out pieces of it, did I realize that while yes, my tests did pass, I didn't cover every edge case. Heck, I don't think I'm supposed to cover every edge case with TDD testing because it slows down the red/green/refactor cycle. So, while it was true that my function returned true every time it should have returned true, and returned false every time it was tested to return false, it also returned true some of the times it was supposed to return false. My dumpster fire was not nearly as contained as I thought
I guess the conclusion is that TDD is great, but it's not magic. It's not going to solve every problem or prevent each and every one from ever happening. I guess that's okay. In the mean time, my world's on fire, how 'bout yours? That's the way I like it because I never get bored. I'm hilarious.
(ﾉ◕ヮ◕)ﾉ*:・ﾟ✧