On: Even Tetris is hard to test

[gamegoblin]

This is why I like using a randomized framework such as QuickCheck (or its derivatives in non-Haskell languages, such as Java) along with typical unit testing. It's often easier to write than tedious unit tests, and it can catch a lot of funny corner cases you don't even think to test.

Of course, this still isn't a guarantee. But it does make me feel better about my code.

[sargun → gamegoblin]

I love QuickCheck. It might be a little hard to do for Tetris.

[gamegoblin → sargun]

Definitely true, but with enough abstraction to small, composable, pure functions, you can get pretty far.