- Over the last year we’ve been sharing our work leveraging large language models to catch bugs on the fly — a novel approach we call Catching Just-in-Time Tests (JiTTests).
Catching Bugs Before They Land: JiTTesting’s Human-on-the-Loop Approach at Full Scale

From the official release
- Now, we’re sharing the results and positive impact we’ve seen with Catching JiTTests deployed into production.
- Our paper, “Just-in-Time Catching Test Generation at Meta,” fully details our initial deployment and testing with Catching JiTTests.
Every code change improves our platform, but it also introduces new complexity. With hundreds of millions of lines of code constantly evolving at Meta, traditional testing can’t keep pace. Catching risks proactively, before code lands, enables us to identify risks earlier, respond more effectively, and deliver reliable experiences at scale.
This is a short excerpt. Read the full announcement on the official source.
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