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Abstract-The component-based software development enables to construct applications from reusable components providing particular functionalities and simplifies application evolution. To ensure the correct functioning of a given component-based application and its preservation across evolution steps, it is necessary to test not only the functional properties of the individual components but also the correctness of their mutual interactions and cooperation. This is complicated by the fact that third-party components often come without source code and/or documentation of functional and interaction properties. In this paper, we describe an approach for performing rigorous semi-automated testing of software components with unavailable source code. Utilizing an automated analysis of the component interfaces, scenarios invoking methods with generated parameter values are created. When they are performed on a stable application version and their runtime effects (component interactions) are recorded, the resulting scenarios with recorded effects can be used for accurate regression testing of newly installed versions of selected components. Our experiences with a prototype implementation show that the approach has acceptable demands on manual work and computational resources.

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In this paper, we describe the deep object comparison (DOC) algorithm, which is used for comparison of general objects in Java programming language based on their internal structures and values of primitive attributes. The DOC algorithm was designed to be utilized in our interface-based regression testing of software components, which enables to uncover subtle changes of the behavior of a component-based application under test with a newly installed version of a software component in comparison to its behavior with an old version of this component.

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