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The Free Model Wrote Tests That Passed. They Still Missed a Bug.

This story is from 2026-08-25. It is preserved in the archive; the latest stories are on the live feed.

The free model wrote four unit tests for a small C++ function. All four passed. The function was still wrong. A coverage tool found the gap that the tests missed. This is a case study about a 10-line function, a model-generated test suite, and the one edge case that slipped through. The lesson is n…

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  1. 2026-08-25 23:32 · DEV Community — AI
    The Free Model Wrote Tests That Passed. They Still Missed a Bug.

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