Test case minimization for regression testing of composite service based on modification impact analysis

Abstract

Composite service implements complex functions by combing different web services. It evolves a lot during its life cycle, and external web service may evolve without prior notice. To ensure the correctness of each evolved version, regression testing must be performed. In this article, an approach is proposed to automatically minimize test cases for regression testing of WS-BPEL (Web Services Business Process Execution Language) compositions based on modification impact analysis. The proposed approach can detect interfacial, structural, and variable changes of WS-BPEL compositions on the basis of WP (WSDL Parsing), BH (BPEL Heading), and BAST (BPEL Abstract Tree). Afterward, we perform a dependency analysis by extracting def-use pairs of modified variables to cover all affected paths. We conducted experiments with 8 WS-BPEL compositions to evaluate the efficiency of our approach. Experimental results show that our approach can recognize the modifications in most cases, and can reduce the original test suite to 51.75% on average.