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UML activity diagram is a notation suitable for modeling a concurrent system in which multiple objects interact with each other. This paper proposes a method to generate test cases from UML activity diagrams that minimizes the number of test cases generated while deriving all practically useful test cases. The method first builds an I/O explicit Activity Diagram from an ordinary UML activity diagram and then transforms it to a directed graph, from which test cases for the initial activity diagram are derived. This conversion is performed based on the single stimulus principle, which helps avoid the state explosion problem in test generation for a concurrent system.
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