Multi-Agent LLM-based Metamorphic Testing for REST APIs

ArXi:2605.28321v1 Announce Type: cross As REST APIs become an increasingly significant part of software systems, their validation is becoming critical. Hence, testing and uncovering underlying issues are of utmost importance for improving software quality. However, testing REST APIs is challenging mainly due to the difficulty of assessing whether the output of an API call is correct, i.e., the test oracle problem. Metamorphic testing is a specification-based testing approach for situations where correct outputs are unknown or not specified explicitly.