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Test-Driven Development (TDD) is an important software development practice that enables rapid iterations, refactoring, and improved quality. Supporting TDD can be difficult when building Service-Oriented Architecture (SOA) applications, since standard test frameworks often do not have capabilities for performing and validating Web service (WS) calls; invoking Web services depends on running and connecting to a service container; and services and clients often have entirely separate implementations. In this paper we present case studies of two SOA applications we developed, GRIDL and TxFlow. These are distributed, multi-language applications using Web services as the interface between service and client components. They implement Web service and client tests both for verification and validation of the application components and to facilitate the TDD process. Our approach to Web service testing to support TDD is easily reproducible in any SOA application without requiring significant development effort or changes to the software design.
Code is conventionally unit tested by “white-box”testing that calls low-level classes and methods inside a testframework. Web service methods have invocation interfacesthat resemble conventional software methods, but areconsiderably more high-level and complex inimplementation. WS methods are defined as collections ofmessage types and formats, typically in Web ServicesDescription Langauge (WSDL), and are implemented byservice containers that both process Web service messagesand handle communication with remote applications. Whena Web service method is called, the service containerperforms multiple operations, including receiving andparsing the Simple Object Access Protocol (SOAP)request message from the remote application, invokingmethods to process the request, formatting a responsemessage, and sending it to the caller. To realistically test aWeb service, the test must act as a client that connects to aninstance of the service container. In this paper, we describetwo case studies illustrating how we implemented Webservice testing to enable TDD.
Change Data Capture (CDC) is used to identify changesmade to data in a database or data store, so that thesechanges can be propagated across a network to other systemsthat need to know about the changes. Change data capture isused in real-time data warehousingand for event-drivenarchitectures. We can think of several other applicationswhere CDC could be used such as, database replication ormirroring, live data monitoring for statistical analysis andlive monitoring on credit card or telephone records for fraudanalysis and detection
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