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My AI Tests Passed While Half the Mutants Went Undetected

If someone asked me how I verified code written by AI, I used to have a simple answer: I ran the tests. My project had 451 tests across 84 files. Claude Code had written them, and I had reviewed and merged them. A green test run felt reassuring. Then a friend mentioned mutation testing. I tried it…

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  1. 2026-11-10 00:34 · DEV Community — AI
    My AI Tests Passed While Half the Mutants Went Undetected

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