Call Stack Coverage for GUI Test-Suite Reduction

Graphical user interfaces (GUIs) are used as front-ends to most of today´s software applications; testing GUIs for functional correctness is needed to ensure the overall correctness of these applications. The event-driven nature of GUIs presents new challenges for testing. One important challenge is test suite reduction. Conventional reduction techniques/tools based on static analysis are not easily applicable due to the increased use of multi-language GUI implementations, callbacks for event handlers, virtual function calls, reflection, and multi-threading. Moreover, many existing techniques ignore event handlers from libraries, and fail to consider the context in which a handler executes. Consequently, they yield GUI test suites with seriously impaired fault-detection ability. This paper presents a new reduction technique based on the call stack coverage criterion. Call stacks may be collected for any executing program with very little overhead. An empirical study involving three large GUI-based applications shows that call stack based reduction provides an excellent tradeoff between reduction in test suite size and loss of fault-detection effectiveness