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How I caught an AI-generated Python regression that the tests missed -hackathon project

The change was small, the diff looked sensible, and the existing tests passed. Then I tried an empty list. The original function returned []. The revised version returned None.

  • An AI-generated Python regression went undetected by tests.
  • Cross-Examine tool caught the discrepancy when empty list passed.
  • Tool uses GPT-5.6 to propose checks and verifies modified code.

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