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A Passing Characterization Test Proves Nothing Until You Break the Code

Most characterization tests in a messy repo are decoration. They pass before the refactor. They pass after it. They would also pass if the branch under test were deleted. That is not a test. It is a receipt. This post adds one cheap gate: prove each new test can fail, by breaking the code on purpos…

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  1. 2026-11-05 23:24 · DEV Community — AI
    A Passing Characterization Test Proves Nothing Until You Break the Code

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