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Concurrent systems work nondeterministically. For concurrent systems, UniTESK-based test suite executes methods with different parameters in different states, but it does not guarantee that all possible execution paths of a method will be tested because of its concurrent nature. This paper presents an integration method that combines the testing techniques with model checking techniques of Java PathFinder (JPF). The method guarantees that all possible execution paths needed for checking the correctness of the system are explored. The method is based on localization of the search performed by JPF. It reduces the state space while preserving the advantages of UniTESK like state abstraction and automatic checking of correctness. Moreover, it allows to use the same test suite without modification with JPF.