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Freeze the Clock Before You Refactor: Characterization Tests for Impure Code

Legacy code is rarely untestable. It is usually just unseeded. A characterization test that reads the wall clock will flake on day two. So freeze the inputs first, then pin the outputs. This is the order that survives review. Below is a reproducible loop: inventory impurity, insert one text-only bo…

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  1. 2026-11-09 00:21 · DEV Community — AI
    Freeze the Clock Before You Refactor: Characterization Tests for Impure Code

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