Scenario-based Testing for Onboard Subsystem

As a typical safety-critical system, the Onboard subsystem is a core subsystem in CTCS-3(Chinese Train Control System level 3), functional test is necessary to validate the conformance relation between the Onboard subsystem and its specification. Most of test cases are manually generated and can't be reused and leads to repeated works when the specification is changed. We introduced scenario-based method to improve the efficiency and quality of onboard equipment testing. The scenario-based hierarchy model of onboard subsystem was established according to the specification, and all definition coverage criteria were proposed with the all definition coverage observer. Then, an automatic tool chain was used to establish the onboard automata model and generate test cases for every scenario. Finally, a selection algorithm was given to choose a complete test sequence from the test cases, which was proven comprehensive to cover all running modes and efficient for onboard equipment testing.