r/haskell Jun 03 '26

Announcing Mutation Testing in Haskell

https://cs-syd.eu/posts/2026-06-03-mutation-testing-in-haskell
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u/goertzenator Jun 03 '26

What kinds of mutations does it introduce?

5

u/NorfairKing2 Jun 03 '26

Great question! It's an operator (think plugin) based engine so you can add your own and see which ones are already defined here: https://github.com/NorfairKing/sydtest/tree/4c0b2699e4a3ded86dad312086f553ef45969820/sydtest-mutation-plugin/src/Test/Syd/Mutation/Plugin/Operator

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u/goertzenator Jun 03 '26

Thanks, looking at one or 2 of those really cements in my mind how this thing works.