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Test case instantiation is the transformation of abstract test cases into executable test scripts. Abstract test cases are either created during model based test case generation or are manually defined in a suitable modeling notation. The transformation varies depending on different testing concerns, such as test goal, test setup and test phase. Thus, for each testing concern a new transformation must be defined. This paper introduces AspectT, an aspect-oriented language for the instantiation of abstract test cases. We reduce the effort of test case instantiation by modularizing testing concerns in the form of aspects to enable their reuse in different testing contexts. The approach is implemented and integrated in an existing testing framework and has been successfully applied to test an electronic control unit of an automotive infotainment system at BMW Group.