The testing of real-time systems within the framework of the distributed real-time system MARS (maintainable real-time system), is considered. After a brief survey of the available literature and an overview of the background of this work, a proposed test strategy for MARS is described and two architectures for testbeds that allow actual test execution in two different test modes are derived. The specification, development and implementation on one specific test tool, the environmental simulator, is considered and its use in the proposed test strategy is discussed. The principles described are being applied to the construction of an experimental application for MARS.
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