GenUTest: A Unit Test and Mock Aspect Generation Tool

Abstract

Unit testing plays a major role in the software development process. It enables the immediate detection of bugs introduced into a unit whenever code changes occur. Hence, unit tests provide a safety net of regression tests and validation tests which encourage developers to refactor existing code. Nevertheless, not all software systems contain unit tests. When changes to such software are needed, writing unit tests from scratch might not be cost effective. In this paper we propose a technique which automatically generates unit tests for software that does not have such tests.We have implemented GenUTest, a tool which captures and logs inter-object interactions occurring during the execution of Java programs. These interactions are used to generate JUnit tests. They also serve in generating mock aspects - mock object like entities, which assist the testing process. The interactions are captured using the aspect oriented language AspectJ.