Author

Samuele Pasini

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Preprint Jul 2026

Testing Retrieval-Augmented Generation Systems with Chunk Coverage

Chunk Coverage (CC), an oracle-independent test adequacy criterion for testing the retrieval component of RAG systems, is introduced and results show that CC captures retrieval diversity relevant to effective testing without requiring test oracles.

Jinhan Kim, Samuele Pasini, Paolo Tonella · 1 citation

Preprint Jul 2026

When Knowledge Changes: Metamorphic Testing of RAG Systems with Mutations

This work introduces a metamorphic testing framework that evaluates the consistency of RAG systems under corpus evolution, formalising a fault taxonomy and 11 mutation operators that systematically perturb the system at both the pre-chunk (retrieval index) and post-chunk (retrieved context) levels.

Jinhan Kim, Samuele Pasini, Paolo Tonella · 1 citation