Web service composition on IoT reliability test based on cross entropy

Web service has developed the managed IoT application to let connected devices easily and securely interact with cloud applications and other devices. As an important factor for web service, the reliability of web services refers to the probability of web service running success. For modeling web service composition, we should abstract the process of web service composition. Due to the diversity and complexity of web service composition, it is unlikely to do exhaustive testing. In order to improve the quality of web service composition test cases and find out which path leads to the greatest probability of service combination failure, heuristic test case generation method is adopted to obtain the optimal test path. First, the web service composition test is abstracted into the MDP model. The QoS of the web service composition is taken as the software test optimization goal, and the cross-entropy strategy is used to optimize the test case. The experimental results show that the test profile given by the cross-strategy is better than the random test strategy. Detect and exclude the same number of software defects. Cross-entropy strategy can significantly reduce the number of test cases, reduce test costs, and improve defect detection efficiency.