Testing Retrieval-Augmented Generation Systems with Chunk Coverage
Researchers introduce Chunk Coverage (CC), an oracle-independent test adequacy criterion for Retrieval-Augmented Generation (RAG) systems. CC measures the fraction of corpus chunks retrieved at least once across a test suite, providing a structural assessment of retrieval behavior. Experiments show that CC-guided testing achieves 50% of attainable coverage up to 4.2x faster than baseline strategies and improves fault detection effectiveness by 10-25%.
Why it matters: This work offers a practical, oracle-free method to evaluate and improve test suites for RAG systems, enhancing their reliability in high-stakes applications.
Full story at: arXiv Software Engineering ↗