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Characterize First, Then Refactor: A Golden-Corpus Harness With a Mutation Gate

Most refactors break behavior that no test ever covered. Adding more hand-written tests is slow and biased toward what you already suspect. A pinned behavior snapshot is faster, and a mutation gate tells you whether that snapshot can actually fail. The rule: pin first, prove the pin bites, then cha…

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  1. 2026-11-08 17:34 · DEV Community — AI
    Characterize First, Then Refactor: A Golden-Corpus Harness With a Mutation Gate

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