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48-Hour Field Notes: A Diff Meter for AI Patches That Quietly Drop Tests

This story is from 2026-09-03. It is preserved in the archive; the latest stories are on the live feed.

Late Thursday I asked a remote model for a one-line fix in a date parser. CI went green in six minutes. The log looked like a win until git show scrolled past the production file and landed on the test: forty lines gone, including the assertion that had been failing. The patch had not repaired the…

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  1. 2026-09-03 11:36 · DEV Community — AI
    48-Hour Field Notes: A Diff Meter for AI Patches That Quietly Drop Tests

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