In this paper, we present Arttest, a tool for functional testing of block diagrams developed
with MATLAB/Simulink. We introduce testing concepts for closed-loop tests of automotive software on model and software level, the integration of the concepts into a signal specification language and correspondent tool support. Furthermore, we show the applicability of the concepts and the test
execution automation based on an example for model-in-the-loop and software-in-the-loop tests.