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Some may argue that the tests are a form of documentation, and that's true, but they still don't capture the why. And tests are almost always separated from the actual code, which makes it more complicated to look at the code and the tests at the same time and understand them together. I've used doctest with Haskell which is a solution to this. Doctest is nice at first but in my experience it wasn't reasonable to do non-trivial tests in doctest, and plenty of tests are non-trivial. So then you're left with the decision to use doctest where you can, and another test solution for non-trivial tests, or just do all tests using the other testing solution. We chose simplicity and got rid of doctest.