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Test-Driven Development With Visual Studio 2005 Erno de Weerd ernow@infosupport Info Support

Test-Driven Development With Visual Studio 2005 Erno de Weerd ernow@infosupport.com Info Support. Agenda. What is Test-Driven Development? How to do TDD TDD and Visual Studio 2005 What now? More Information Q&A. What is TDD?.

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Test-Driven Development With Visual Studio 2005 Erno de Weerd ernow@infosupport Info Support

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  1. Test-Driven Development With Visual Studio 2005Erno de Weerdernow@infosupport.comInfo Support

  2. Agenda • What is Test-Driven Development? • How to do TDD • TDD and Visual Studio 2005 • What now? • More Information • Q&A

  3. What is TDD? “Test-Driven Development seeks specification, not validation, letting you think through your design before you write your functional code” - Scott Ambler “Test-Driven Development is a powerful way to produce well designed code with fewer defects” - Martin Fowler

  4. What is TDD? • ‘History’: • The inner loop of Extreme Programming • TDD is: • A design method (and more) • TDD is not: • Just writing tests first • A guarantee of quality • Unit testing

  5. What is TDD? • TDD as a Design Method: • Evolutional • Baby steps • Iterative

  6. What is TDD? • Evolutional: • No Analysis and Design first • Resilience when requirements are discovered or change

  7. What is TDD? • Baby Steps: • One test at the time • Avoid complex code • Code quickly • Fix the current test • The majority of invested time should be spend on refactoring

  8. Run all tests Refactor Update test list Pick a test Make the code pass the test See the test fail Write the test Get the code to compile and FAIL What is TDD? • Iterative

  9. How to do TDD • Updating the Test List • Add small portions of functionality • Add extra test cases • Do not try to make the list complete from the start • Prioritize the tests • Risk, ability, … • Do this during the entire process • Do NOT get sidetracked!

  10. How to do TDD • Pick a Test • Pick the single test on top of the test list

  11. How to do TDD • Write the Test • Keep the code as clean as possible • Update the test list instead of coding extra tests DEMO

  12. How to do TDD • Get the Code to Compile and FAIL • Add a method stub that throws an exception • NotImplementedException DEMO

  13. How to do TDD • See the Test Fail • You want to be sure it fails: Test the test… DEMO

  14. How to do TDD • Make the Code Pass the Test • Don’t worry too much about ‘clean’ code • Get the work done • Do NOT add code that is not being tested • Do NOT use too many stubs/mockups DEMO

  15. How to do TDD • Refactor • Cleaning up • Remodeling without changing external behavior • This is where the Unit Tests prove their use • Allows easy addition of new code • Breaking down large methods/classes • Removing duplicates • Reordering code DEMO

  16. How to do TDD • Run All Tests • Making sure you didn’t break the solution • Theoretically: Always run all tests • This might take to long  always run all tests when making a daily build DEMO

  17. TDD and Visual Studio 2005 • From the Demo: • Unit Testing • Generating stubs • Generating tests • Debugging • Coverage checking • Refactoring

  18. TDD and Visual Studio 2005 • Visual Studio Also Allows: • ‘GUI’ testing • Load testing (Web Applications) • Performance monitoring • Team System Allows to: • keep track of work items • keep track of progress • force the tests to run successfully before enabling to check-in the code

  19. TDD and Visual Studio 2005 • Visual Studio 2005 Delivers the Tools • It does NOT force you to use them • They can be used in ANY kind of software development process (MSF, RUP, XP, …)

  20. What now? • Developers: • Learn to Refactor • Learn Unit Testing • Learn Whidbey • Technical Project Leaders: • Learn/adopt a Software Development Method • Learn Visual Studio Team System/Foundation Server

  21. More Information • http://www.infosupport.com • http://msdn.microsoft.com • http://www.testdriven.com • “Refactoring: Improving the Design of Existing Code” - Martin Fowler

  22. More Information • MSDN Fast Track • http://www.microsoft.nl/msdnfasttrack • Technical Seminars (1 day) & Technical Training (3-5 days) • SQL Server Database Development • Visual Studio Team System • SQL Server Business Intelligence • Smart Client Development • Web Development

  23. Q&A

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