We present a generalization of the classical theory of testing for Mealy machines to a setting of dense real-time systems. A model of timed I/O automata is introduced, inspired by the timed automaton model of Alur and Dill, together with a notion of test sequence for this model. Our main contribution is a test generation algorithm for black-box conformance testing of timed I/O automata. Although it is highly exponential and cannot be claimed to be of practical value, it is the �rst algorithm that yields a �nite and complete set of tests for dense real-time systems.
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