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Witness Maps: Never Refactor a Line That No Test Executes

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

A 41-file cleanup diff lands on a Tuesday morning, the CI suite is green, and the reviewer approves it in nine minutes. Two days later an invoicing edge case breaks in production, inside a function that no test has ever entered. The suite was not lying — it simply never executed the lines that chan…

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  1. 2026-10-20 09:37 · DEV Community — AI
    Witness Maps: Never Refactor a Line That No Test Executes

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