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Mutate the Fixture, Not the Code: Catching Agent Tests That Only Mirror the Implementation

Most agent-written tests pass for the wrong reason: the fixture already contains the answer. The test asserts that the code reproduces a value that was copied out of the code in the first place. Code mutation testing rarely catches this, because the mutant dies on some other assertion in the same f…

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  1. 2026-11-06 11:44 · DEV Community — AI
    Mutate the Fixture, Not the Code: Catching Agent Tests That Only Mirror the Implementation

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