Introduction of wireless vehicular communications enables a variety of new Intelligent Transportation System (ITS) use-cases [1, 2], allowing the services to cooperate between vehicles and infrastructure. Furthermore modern vehicles feature an increasing number of driving automation functions. This paper identifies requirements for cooperative and automated ITS, with a special emphasis on the setup of the test environment to test and evaluate them. Subsequently two architectural designs for the test platform called MoSAIC based on DLR's service-oriented middleware DOMINION are described. Finally the concepts are assessed with respect to the identified requirements and by the use of a prototype implementation for a traffic light assistance system.