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Mock Objects

• http://www.mockobjects.com/

A mock object is a "double agent" used to test the behaviour of other objects. First, a mock object acts as a faux implementation of an interface or class that mimics the external behaviour of a true implementation. Second, a mock object observes how other objects interact with its methods and compares actual behaviour with preset expectations. When a discrepancy occurs, a mock object can interrupt the test and report the anomaly. If the discrepancy cannot be noted during the test, a verification method called by the tester ensures that all expectations have been met or failures reported. [1]