Enhancing Search-based Testing with Testability Transformations for Existing APIs

Search-based software testing (SBST) has been shown to be an effective technique generate test cases automatically. Its effectiveness strongly depends on the guidance of fitness function. Unfortunately, a common issue in SBST is so-called flag problem , where landscape presents plateau that provides no search. In this article, we provide series novel testability transformations aimed at providing context commonly used API calls (e.g., strings need converted into valid date/time objects). We also specific helping REST Web Services. implemented our techniques as extension EvoMaster tool generates system-level cases. Experiments nine open-source web services, well industrial service, show improve performance significantly.