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Your Agent Patch's Tests Never Touched the Changed Lines: A Diff-Coverage Gate

This story is from 2026-10-17. It is preserved in the archive; the latest stories are on the live feed.

A green suite after an agent patch tells you one thing: nothing you ran crashed. It does not tell you that anything you ran executed the lines that changed. Those two statements only connect when some test actually enters the new code — and with agent patches, that connection is precisely what brea…

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  1. 2026-10-17 01:52 · DEV Community — AI
    Your Agent Patch's Tests Never Touched the Changed Lines: A Diff-Coverage Gate

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