Program Comprehension for User-Assisted Test Oracle Generation

Software testing requires a test oracle that makes an assessment of the correctness of the tested program behaviour, based on a priori created model. While test automation is a popular research topic, there is only a limited amount of work in the subject of automating the process of creating test oracles. This lack of test oracle automation greatly limits the usefulness of automated testing techniques. One reason for this is the difficulty to automatically determine the correctness of previously unknown software. Instead the task of coming up with a useful oracle is often left to the user as a manual task. Program comprehension techniques are focused on supporting the building of human understanding for a previously un-known program, and as such are good candidates to assist in the test oracle creation process. This paper addresses the lack of automated support for test oracle creation by providing a framework for using program comprehension techniques to provide automated assistance to the user in creating test oracles. Based on analysis of existing work and theoretical background, the basic concept for this process is defined. A case example demonstrates the practical application of this concept with the generation of a model, including a test oracle, for model-based testing. From the existing approaches and the presented case example, a framework for this type of process is presented in order to provide a basis for providing more powerful techniques for user-assisted test oracle generation.