Abstract
This paper presents a novel approach of generating regression test cases from UML design diagrams. Regression testing can be systematically applied at the software components architecture level so as to reduce the effort and cost of retesting modified systems. Our approach consists of transforming a UML sequence diagram of a component into a graphical structure called the control flow graph (CFG) and its revised version into an Extended control flow graph (ECFG) The nodes of the two graphs are augmented with information necessary to compose test suites in terms of test case scenarios. This information is collected from use case templates and class diagrams. The graphs are traversed in depth-first-order to generate test scenarios. Further, the two are compared for change identification. Based on change information, test cases are identified as reusable, obsolete or newly added. The regression test suite thus generated is suitable to detect any interaction and scenario faults.
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