Component Based Testing with ioco

Component based testing concerns the integration of components which have already been tested separately. We show that, with certain restrictions, the ioco-test theory for conformance testing is suitable for component based testing, in the sense that the integration of fully conformant components is guaranteed to be correct. As a consequence, there is no need to re-test the integrated system for conformance. This result is also relevant for testing in context, since it implies that every failure of a system embedded in a test context can be reduced to a fault of the system itself