Does your regression test actually catch the bug?

介绍

Verify that regression tests catch the bug they claim to prevent. Deterministic, replayable evidence for agent-assisted development.

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Does your regression test actually catch the bug? AssertLedger runs the same test against fixed code, a known fault and a neutral control. You get a verdict, the observations behind it and an evidence file you can replay. Install in your repository with Node.js 22.15 or later: The historical correction demo runs from the installed package. The source example below walks through the evidence step by step. A passing test can miss the bug Suppose isEven(2) should return true. A regression accidentally inverts the implementation.