Meta’s TestGen‑LLM: AI‑Driven Automatic Unit Test Generation for Kotlin Code
In 2024 Meta introduced TestGen‑LLM, an AI‑powered tool that automatically generates Kotlin unit tests using large language models, improving test coverage through a multi‑stage pipeline of candidate generation, compilation filtering, execution filtering, coverage validation, refactoring, and engineer review, with reported coverage gains across Facebook and Instagram codebases.