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The Agent's Tests Passed. Mutation Testing Showed 2 of 4 Faults Survived.

This story is from 2026-08-26. It is preserved in the archive; the latest stories are on the live feed.

The agent patch passed the gates I ran on it. Its unit tests were green, fixtures matched, nothing was flaky. Then I seeded four faults into the implementation, one at a time. Two survived. That gap is what this article is about. A green suite is a claim, not a measurement. Mutation testing turns i…

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  1. 2026-08-26 15:48 · DEV Community — AI
    The Agent's Tests Passed. Mutation Testing Showed 2 of 4 Faults Survived.

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