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The process of testing any software system is an enormous task which is timeconsuming and costly. The time and required effort to do sufficient testinggrow, as the size and complexity of the software grows, which may cause overrunof the project budget, delay in the development of software system or some testcases may not be covered. During SDLC (software development life cycle),generally the software testing phase takes around 40-70% of the time and cost.State-based testing is frequently used in software testing. Test datageneration is one of the key issues in software testing. A properly generatedtest suite may not only locate the errors in a software system, but also helpin reducing the high cost associated with software testing. It is often desiredthat test data in the form of test sequences within a test suite can beautomatically generated to achieve required test coverage. This paper proposesan optimization approach to test data generation for the state-based softwaretesting. In this paper, first state transition graph is derived from statechart diagram. Then, all the required information are extracted from the statechart diagram. Then, test cases are generated. Lastly, a set of test cases areminimized by calculating the node coverage for each test case. It is alsodetermined that which test cases are covered by other test cases. The advantageof our test generation technique is that it optimizes test coverage byminimizing time and cost. The proposed test data generation scheme generatestest cases which satisfy transition path coverage criteria, path coveragecriteria and action coverage criteria. A case study on Automatic Ticket Machine(ATM) has been presented to illustrate our approach.

Generation and Optimization of Test cases for Object-Oriented Software Using State Chart Diagram