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Catching Bugs Before They Land: JiTTesting’s Human-on-the-Loop Approach at Full Scale

Meta Engineering

Catching Bugs Before They Land: JiTTesting’s Human-on-the-Loop Approach at Full Scale Blogs

Meta deployed Catching JiTTests—LLM-generated tests designed to fail on a code change before it lands—into production infrastructure, moving it from research prototype to a system that catches more bugs with less load and a smaller chance of false positives.

Key findings

  • JiTTests are automatically generated and designed to fail, surfacing bugs in diffs before they land in production.
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