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In this paper we present a new test model of object oriented (OO) programs for testing conformity and robustness from formal specifications. The main contribution of this work is a robustness approach based on invalid input data that do not satisfy the precondition constraint of the program under test. This additional test is used to strengthen the conformity test of programs and to enrich the concept of test by detecting other contract anomalies between user and programs. The approach of this work shows that the test cases developed for testing an original method can be used for testing its overriding method in derived classes by inheritance operation and then the number of test cases can be reduced considerably. In this context we can use a single generator of test data to verify both conformity and robustness, thus making it possible to increase the level of automation during the whole testing process.

A Robustness Testing Approach for an Object Oriented Model