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Not sure if you're being sarcastic, but Haskell developers should definitely write tests, and good ones know how to write good tests. The type system eliminates the need for some forms of testing, but not all.

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Thanks for the feedback. I am definitely a beginner in Haskell, which would explain why I came to this conclusion. Could you recommend some good sources on testing in Haskell?

While of course Haskell has more normal testing infrastructure available (eg. https://hspec.github.io/), my favorite bit of Haskell testing is QuickCheck, which IIUC started life in Haskell and has been reimplemented in other languages with various degrees of effectiveness and various degrees of connection to the original project.

John Hughes (not the filmmaker) gives a great talk about it: https://youtu.be/zi0rHwfiX1Q

Thank you very much! I just finished watching the video and am now reading more on QuickCheck. This approach makes a lot of sense.

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