hypothesis.works articles: Testing performance optimizations

Once you’ve flushed out the basic crashing bugs in your code, you’re going to want to look for more interesting things to test.

The next easiest thing to test is code where you know what the right answer is for every input.

Obviously in theory you think you know what the right answer is - you can just run the code. That’s not very helpful though, as that’s the answer you’re trying to verify.

But sometimes there is more than one way to get the right answer, and you choose the one you run in production not because it gives a different answer but because it gives the same answer faster.