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Characterization Tests First: Freeze a Messy Function, Then Make One Safe Edit

Freeze the outputs first. Make one edit second. Prove the diff is zero third. That order matters in a messy repo. Most refactors fail at step one, not step three. This post gives a small, reproducible harness for that order. It has four parts: harvest real inputs, pin golden outputs, kill three pla…

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  1. 2026-11-08 20:16 · DEV Community — AI
    Characterization Tests First: Freeze a Messy Function, Then Make One Safe Edit

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