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Fixtures Rot Quietly: A Two-Corpus Audit for Agent Patches

Most agent-patch gates watch the source diff. The fixture diff is where the meaning of a test quietly changes. An agent that edits src/parse.py and tests/fixtures/parse/expected.json in the same patch can produce a fully green run and a broken parser. The test still passes. The assertion still exec…

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  1. 2026-11-08 02:05 · DEV Community — AI
    Fixtures Rot Quietly: A Two-Corpus Audit for Agent Patches

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