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Dead Probes Pass: Mutation-Check Your Characterization Tests Before You Refactor

This story is from 2026-08-27. It is preserved in the archive; the latest stories are on the live feed.

A passing characterization suite is not a safety net. It is a net only if it fails on wrong behavior. Here is how to verify that in twenty minutes. You wrote probes against a messy legacy module. They all pass. You feel ready to refactor. Do not trust that feeling. Passing on current code proves no…

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  1. 2026-08-27 04:03 · DEV Community — AI
    Dead Probes Pass: Mutation-Check Your Characterization Tests Before You Refactor

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