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The Patch Edited the Fixture, Not the Code: Catching Fixture Laundering in Agent Patches

The most common way an agent patch defeats a test suite is not deleting an assertion. It regenerates the fixture that the assertion reads. The test stays green, the test count is unchanged, and the assertion silently starts measuring a different world. This post is about making that move visible an…

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  1. 2026-11-08 11:24 · DEV Community — AI
    The Patch Edited the Fixture, Not the Code: Catching Fixture Laundering in Agent Patches

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