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Fixture Drift: Why Agent Patches Pass Green Tests and Break Production

This story is from 2026-08-30. It is preserved in the archive; the latest stories are on the live feed.

Your agent patch is green. Every unit test passes. Two weeks later, production breaks and the blame lands on the patch. Often the patch was fine. The fixture was a liar. Fixture drift happens when test data no longer matches the contracts the code actually enforces. Agents change the code. Nobody c…

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  1. 2026-08-30 21:48 · DEV Community — AI
    Fixture Drift: Why Agent Patches Pass Green Tests and Break Production

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