Seed Five Mutations Before You Trust a Characterization Test A green characterization suite proves nothing by itself. Prove the suite can fail before you trust it. Seed deliberate mutations into the messy code, then keep only the refactors your harness actually catches.

Source: [Dev.to](https://dev.to/hackrs_6393/seed-five-mutations-before-you-trust-a-characterization-test-1plj)

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