Bringing test-driven development to web service choreographies

摘要

Service-oriented architecture (SOA) is a set of principles and procedures where services are used as building blocks in the distributed applications. A web service may have many component services that together make up a block. The coordination among choreographed services is distributed across all participants and are independent in the local functions. In other words the choreographic architecture is totally decentralized. The internet services are now changing towards more decentralized scalable services in a mobile environment ensuring security, reliability and robustness. This goal can be achieved by choreographies. The standards now available for this architecture are web services choreography description language and the OMG business process model and notation version 2 (BPMN2) but with only limited acceptance. As it is, choreographies are implemented in an ad hoc manner often resulting in undesirable results. This article proposes application of TDD for construction and testing of choreographies. Since TDD employs a technique called test-first programming, the developer can foresee the possible errors beforehand and prevent them. It is found empirically that TDD increases code quality and reduces the number of defects. Summing up, this article proposes a novel framework for automated offline testing of web service choreographies, and a development methodology that facilitates the developer to use the framework with TDD.