International audienceWhile Service Oriented Architectures (SOAs) are for many parts deployed online, and today often in a cloud, the testing of the systems still happens mostly locally. In this paper, we want to present the MIDAS Testing as a Service (TaaS), a cloud platform for the testing of SOAs. We focus on the testing of whole SOA orchestrations, a complex task due to the number of potential service interactions and the increasing complexity with each service that joins an orchestration. Since traditional testing does not scale well with such a complex setup, we employ a Model-based Testing (MBT) approach based on the Unified Modeling Language (UML) and the UML Testing Profile (UTP) within MIDAS. Through this, we provide methods for functional testing, security testing, and usage-based testing of service orchestrations. Through harnessing the computational power of the cloud, MIDAS is able to generate and execute complex test scenarios which would be infeasible to run in a local environment

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