Meta Reports 4x Higher Bug Detection with Just-in-Time Testing

Meta introduces Just-in-Time (JiT) Testing, a dynamic approach generating tests during code review rather than relying on static test suites. Using LLMs, mutation testing, and intent-aware workflows like Dodgy Diff, JiT achieves 4x higher bug detection in AI-assisted development. This represents a shift toward change-aware, AI-driven testing in agentic development environments, improving software quality significantly.