Best practices-for-testing-soa-based-systems

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The purpose of testing in general is to assess applications quality. Many approaches existing for traditional software systems can be adapted or even reused for service-oriented systems. …

The purpose of testing in general is to assess applications quality. Many approaches existing for traditional software systems can be adapted or even reused for service-oriented systems. Service-oriented testing has many similarities with component-based testing.

This session persents best practices for testing service-oriented systems and will show some real scenarios based around Web Services, Enterprise Service Bus and BPEL/BPMN.

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  • Hier könnte eine Kopfzeile stehen 08.10.10 Hier könnte eine Fusszeile stehen Ihr müsst nicht alle Punkt aufzählen. Vielleicht der Hinweis, CH-Unternehmen mit 13 Standorten in D-A-CH, Anzahl Mitarbeiter und das wir finanziell unabhängig sind.

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  • 1. Best Practices for Testing SOA based systems SOA Symposium 2010 Guido Schmutz, Technology Manager / Partner Trivadis AG 5.10.2010, Berlin
  • 2. Introduction
    • Guido Schmutz
      • Working for Trivadis for more than 13 years
        • leading and independent IT service company operating in Germany, Austria and Switzerland
      • Oracle ACE Director for Fusion Middleware and SOA
      • Co-Author of different books
      • Consultant, Trainer Software Architect for Java, Oracle, SOA and EDA
      • More than 20 years of software development experience
      • Contact: [email_address]
      • Blog: http://guidoschmutz.wordpress.com/
    Best Practices for Testing SOA based systems
  • 3. About Trivadis
    • Swiss IT consulting company
      • 13 locations in Switzerland, Germany and Austria
      • ~ 540 employees
    • Key figures 2009
      • Services for more than 650 clients in over 1‘600 projects
      • Over 150 service level agreements
      • More than 5‘000 training participants
      • Research and development budget: CHF 6.0 Mio. / EUR 3.6 Mio.
  • 4. Agenda
    • Introduction
    • Scenario with Oracle SOA Suite 11g as an example
    • Unit Testing of Oracle SOA Suite 11g components
    • Integration Testing of Oracle SOA Suite 11g composites
    • Summary
    Best Practices for Testing SOA based systems Data are always part of the game.
  • 5. Testing of SOA based solutions
    • For testing N-tier solutions some common best practices have been established
      • Unit and Integration Tests
      • Test Driven Development / Test-First Approach
      • Mock Objects
    • A lot of these approaches can be used/adapted for testing SOA solutions as well
    Best Practices for Testing SOA based systems
  • 6. Testing of SOA based solutions
    • Testing a SOA solution is as/even more important
      • Often enterprise wide systems (backbone of an enterprise)
      • Many different users
      • Each single error can have a huge impact
    • Even if SOA uses a lot of existing functionality, it’s not enough to just test the existing functionality
      • A SOA adds some additional logic which needs to be tested as well!
        • Router
        • Filter
        • Enrichment
        • Service Orchestration
        • Business Process Logic
        • Rules
    Best Practices for Testing SOA based systems
  • 7. Challenges for testing SOA based solutions
    • SOA environments are inherently heterogeneous
    • SOA solutions typically integrate a set of packaged or custom applications
    • not always possible to provide a dedicated testing environment for all the systems involved
    • SOA often works asynchronously
      • Tests are usually carried out in a synchronous way,
    • Business processes often depend on timed events
    • unit of test usually larger than in traditional applications
    Best Practices for Testing SOA based systems
  • 8. Automatic Testing
    • Relies on automatic, programmatic execution of the different test scenarios
    • results can be verified against expected results
    • Efficient development and execution of test cases only achievable through Testing Frameworks
      • i.E. JUnit for Java
    • A Testing Framework provides some common, reusable components for
      • Creating a test
      • Executing a test
      • Verifying test results
    Best Practices for Testing SOA based systems
  • 9. Functionalities of a Testing Framework
    • Generator
      • Produces the test data
      • Executes the components under test
    • Verifier/Asserter
      • Compares the actual test results with the expected results
      • a Verifier/Asserter makes an accurate, binary decision whether a test was successful or not
    • Mock/Stub
      • Testing component which simulates part of the system to be tested
    Best Practices for Testing SOA based systems
  • 10.
    • Focuses on one specific component of the system
    • Outside dependencies should be isolated as much as possible to ensure testing of the component in isolation
      • Easier to achieve with low-level component
    • Integration issues between components may not be discovered
      • But later integration tests can rely on well-written and (unit)tested components
    Unit / Component Testing Best Practices for Testing SOA based systems
  • 11.
    • Focuses on the interaction between multiple components
    • Focuses on the lower layers first
      • Because they have the least external dependencies
    • If the test fails in a component of an upper layer, its less likely that the reason is a faulty lower layer component
      • These have already been tested
    • Also referred to as Bottom-Up Testing
    Integration Testing Best Practices for Testing SOA based systems t
  • 12. Agenda
    • Introduction
    • Scenario with Oracle SOA Suite 11g as an example
    • Unit Testing of Oracle SOA Suite 11g components
    • Integration Testing of Oracle SOA Suite 11g composites
    • Summary
    Best Practices for Testing SOA based systems Data are always part of the game.
  • 13. Sample scenario Request Generate ID Read customer info Validate credit card Internal External Best Practices for Testing SOA based systems
  • 14. Oracle SOA Suite 11gR1 PS2 Architecture Oracle Restricted and Confidential Unified Runtime BPMN Policy Manager Optimized binding Human Workflow (+AMX, AG, Orgn) Business Rules Oracle Service Bus Common JCA-based connectivity infrastructure Repository EM console +BPMN Screens BAM B2B Mediator Workspace Process Portal (WC spaces) MS Office BPM Studio (with Business and IT views) Shared BPMN Model Business View BPA BPMN 2.0, BPEL Rich End User Interaction Web based customization Process Composer BPEL Process Analytics Proc Cubes
  • 15. Implementation with Oracle SOA Suite 11g
    • SCA composite with the Business Process and a Mediator for customer integration
    • Credit card validation implemented as a service on the Oracle Service Bus service
      • Routes to the right credit card institute to be called
    Best Practices for Testing SOA based systems
  • 16. Artifacts to be tested
    • BPEL/BPMN flow logic
      • Decisions, Orchestrations, Timeouts, Asynchronous Interactions
    • Mediator logic
    • OSB flow logic
    • XQuery / XSL Transformations
    • Business Rules
    Best Practices for Testing SOA based systems
  • 17. Is this way of testing good enough? Best Practices for Testing SOA based systems Oracle Service Bus Console Oracle Enterprise Manager
  • 18. Agenda
    • Introduction
    • Scenario with Oracle SOA Suite 11g as an example
    • Unit Testing of Oracle SOA Suite 11g components
    • Integration Testing of Oracle SOA Suite 11g composites
    • Summary
    Best Practices for Testing SOA based systems Data are always part of the game.
  • 19. Unit testing of a Oracle SOA Suite SCA component
    • Oracle SOA Suite 11g provides a testing framework with the following features
      • Definition of tests, assertions and emulations via JDeveloper
      • Starting Tests from the EM console or via the command line using ANT
      • Test Reports via EM console or via JUnit report
    • A test case contains
      • Initiation ( Generator )
        • Defines the services and operations, which will be called with test data
      • Emulation ( Mock )
        • Defined the message or error, which will be returned from a reference or a component
      • Assertion ( Verifier )
        • Compares the message or part of the message against expected data
    Best Practices for Testing SOA based systems
  • 20. Unit testing of an 11g SCA component
    • CustomerMediator called, but database access (via DB-Adapter) only simulated
    • Answer of CreditCardService simulated
    • Allocation of the request ID simulated
      • Fixed and deterministic values are always returned
      • Important to be able to test the answer with an Asserter (Verifier) against an expected message
    Best Practices for Testing SOA based systems
  • 21. Initial message, will be sent to the BPEL component ( Generator ) Emulated answer from customer service, without calling the real service ( Mock ) Answer will be tested against the expected message ( Verifier ) Best Practices for Testing SOA based systems
  • 22. Executing test cases
    • Test cases will be deployed with the normal deployment of an SCA composite
    • Unit tests can be executed via Enterprise Manager (EM) console
    Best Practices for Testing SOA based systems
  • 23. Different Unit Testing Patterns
    • With Mediator logic
    • Without Mediator logic
    Best Practices for Testing SOA based systems With Customer Service Mediator only
  • 24. Unit Testing Oracle Service Bus (OSB) service
    • In order to be able to test the OSB service isolated (as a unit) there must be a way to simulate the two service references
      • Mocks for Visa and Amexco
    • This way the Routing and Transformation logic can be tested
    Best Practices for Testing SOA based systems Amexco Visa Mock Generate Mock
  • 25. But how do I get these Mock Services?
    • The Unit Testing Framework of Oracle SOA Suite 11g is not available for Oracle Service Bus services
    • Should we start implementing the Mock Services as own web services with the language of our choice?
      • Maybe using scripting language like Groovy or Ruby?
    • One advantage of SOA is the standardized definition of the interfaces through WSDL and XSD
      • There are more and more utilities/tools available, simplifying some of the tasks with a SOA solution
        • Functional testing
        • Load testing
    Best Practices for Testing SOA based systems
  • 26. soapUI
    • Tool for Web Service Testing
    • Available in a free version
    • Supports the Testing of SOAP as well as REST Web Services
    • Covers the following functionalities:
      • Inspection and call of web services
      • Functional testing of web services
      • Load testing of web services
      • Creation of Web Service Dummies (Mock Services)
    Best Practices for Testing SOA based systems http://www.soapui.org/
  • 27. Mock Service for the Visa Service Best Practices for Testing SOA based systems Mock
  • 28. Fault Response and dynamic values with soapUI Best Practices for Testing SOA based systems
  • 29. Executing WebService with soapUI Best Practices for Testing SOA based systems Request Response
  • 30. Unit Testing Transformations
    • Automated Unit testing of Transformations is not supported!
      • developers tests are possible
      • automated with XMLUnit ?
    Best Practices for Testing SOA based systems
  • 31. Unit Testing Transformations - Idea
    • The transformation logic is often implemented in either XQuery or XSLT
    • How can this transformation be tested ?
    • Idea:
      • Implement a special service on the ESB just for testing the XQuery/XSLT artifacts
        • In order to make sure to use the same XQuery/XSLT engine
      • Use XMLUnit to compare expected and actual result
    Best Practices for Testing SOA based systems
  • 32. Agenda
    • Introduction
    • Scenario with Oracle SOA Suite 11g as an example
    • Unit Testing of Oracle SOA Suite 11g components
    • Integration Testing of Oracle SOA Suite 11g composites
    • Summary
    Best Practices for Testing SOA based systems Data are always part of the game.
  • 33. Integration Testing of SOA solutions
    • All the single components are deployed and wired together in a dedicated testing environment
      • Can be automated using Ant / WLST
      • connected with the corresponding test versions of the external services
    • What should we do, if there is no test version available of a given (external) service?
    • What should we do, if the service is not yet available?
    Best Practices for Testing SOA based systems
  • 34. Integration Testing of SOA solutions
    • How can the behavior of an external service be influenced?
      • So that different outcomes can be tested
      • to test the behavior of a SOA solution in an error case, the error situation has to occur
      • How to force a (external) service to produce an error at the right time?
    • The solution is again a Mock Service, which takes over the place of the external services
    Best Practices for Testing SOA based systems
  • 35. Integration Testing with soapUI
    • Tests can be combined into a Test Suite and run all together
    • Tests can assert, that the right outcome of a service call
    Best Practices for Testing SOA based systems
  • 36. Agenda
    • Introduction
    • Scenario with Oracle SOA Suite 11g as an example
    • Unit Testing of Oracle SOA Suite 11g components
    • Integration Testing of Oracle SOA Suite 11g composites
    • Summary
    Best Practices for Testing SOA based systems Data are always part of the game.
  • 37. Summary
    • Best Practices for testing conventional applications are valid for SOA based solutions as well
    • Unit Testing of SCA components is well supported via the Oracle SOA Suite 11g testing framework
      • Not complete yet, but already quite usable
      • Would be nice to be able to zoom into BPEL and BPMN with unit testing (was there in 10g)
    • Integration Testing can be implemented with soapUI
      • calling SOA Suite services
      • Creating a Mock Service for an external service
      • soapUI is much more powerful than shown here
    • All the Tests shown can be automated
    Best Practices for Testing SOA based systems
  • 38. Thank you! SOA Symposium 2010 Guido Schmutz, Technology Manager / Partner Trivadis AG 5.10.2010, Berlin My other session @ SOA symposium: Tuesday 15:30 Using Domain Specific Language(s) to Simplify Creating SOA Artifacts Contact: [email_address] Blog: http://guidoschmutz.wordpress.com/