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Codex or Claude wrote my tests — how do I actually trust them?

This story is from 2026-10-28. It is preserved in the archive; the latest stories are on the live feed.

Short answer: don't trust them because they're green. AI writes tests that assert the code's current behavior — including the bugs. Earn the confidence by mutation testing: change the code on purpose and check the tests fail. The ones that stay green are lying to you. Last month I let Claude genera…

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  1. 2026-10-28 19:37 · DEV Community — AI
    Codex or Claude wrote my tests — how do I actually trust them?

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