IT ServicesProgram synthesis and verification-guided generation: the LLM interprets natural-language fault concerns, generates code mutants, filters or checks them, and generates tests that kill those mutants.deployed internally at meta across several platforms, with ongoing expansion and research into mutant relevance and existing-fault detection.

ACH mutation-guided LLM test generation for privacy regression hardening

An engineer describes a type of privacy bug in plain English; the system creates fake versions of that bug in code, then writes unit tests that prove they would catch that bug before it reaches production.

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Pull Request Mock-Backed Development and LLM Test Generation

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Source

https://engineering.fb.com/2025/02/05/security/revolutionizing-software-testing-llm-powered-bug-catchers-meta-ach