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Unit Testing MVVM in Silverlight

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Unit Testing MVVM in Silverlight

  1. 1. Timmy Kokke Silverlight / ASP.Net Developer UNIT4 Internet Solutions Expression Blend MVP
  2. 2. Basics of MVVM Unit Testing Silverlight Unit Testing framework StatLight
  3. 3. Model View ViewModel
  4. 4. Model View ViewModel
  5. 5. Model View ViewModel
  6. 6. Model View ViewModel
  7. 7. Model View ViewModel Databinding Commands Methods Events
  8. 8. Unit tests are consistent, isolated, fast and repeatable
  9. 9. Test only small units of work TestName = Requirement 1 Assert per test Self explanatory Readability over Maintainability
  10. 10. Silverlight Toolkit http://silverlight.codeplex.com Runs in browser, no support for MsTest
  11. 11. [TestClass] public class ExampleTests{ [TestMethod] public class Adding_1_And_1_Should_Be_2(){ int result = 1 + 1; Assert.AreEqual(2, result); } }
  12. 12. ServerSilverlightClient GamesViewModel GamesView GamesDataService WCF Ria Service Database
  13. 13. UnitTest ServerSilverlightClient GamesViewModel GamesView GamesDataService WCF Ria Service Database TestGamesDataService IGamesDataService GamesViewModelTests
  14. 14. [TestMethod] [Tag("Rating")] public void Setting_Ratings_Should_Set_AverageRating() { Rating rating = new Rating(); rating.GameplayRating = 4; rating.GraphicsRating = 2; Assert.AreEqual(3, rating.AverageRating); }
  15. 15. [TestMethod] [Description("Testing implementation of IDataErrorInfo."+ "Empty String Name should return Error.")] public void Getting_ErrorInfo_For_Empty_Name_Should_Return_Error() { Rating errorInfo = new Rating {Name = string.Empty}; string result = errorInfo["Name"]; Assert.IsFalse(string.IsNullOrWhiteSpace(result)); }
  16. 16. [TestMethod] [Asynchronous] public void Executing_InitializeCommand_Should_Get_Publishers() { PublishersViewModel viewModel = new PublishersViewModel( new TestPublishersDataService()); viewModel.PropertyChanged += (s, a) => { Assert.IsTrue(viewModel.Publishers != null); EnqueueTestComplete(); }; viewModel.InitializeCommand.Execute(null); }
  17. 17. [TestMethod] [Bug("Submitting is not implemented at this moment.")] [WorkItem(1543)] [Asynchronous] public void Executing_SubmitCommand_Should_Navigate_To_GamesList() { DecoupledEventAggregator.GetInstance() .GetEvent<NavigateToEvent>().Subscribe((a) => { Assert.IsTrue(true); EnqueueTestComplete(); }); RatingViewModel viewModel = new RatingViewModel(new TestGamesDataService()); viewModel.SubmitCommand.Execute(null); }
  18. 18. [TestMethod] [Asynchronous] [Timeout(250)] public void Executing_GetMoreCommand_Should_Respond_In_250ms() { PublishersViewModel viewModel = new PublishersViewModel(new TestPublishersDataService()); viewModel.PropertyChanged += (s, a) => { Assert.IsTrue(true); EnqueueTestComplete(); }; viewModel.GetMoreCommand.Execute(null); }
  19. 19. [TestMethod] [ExpectedException(typeof(ArgumentNullException))] public void Executing_SubmitCommand_With_Null_Should_Throw_Exception() { RatingViewModel viewModel = new RatingViewModel(new TestGamesDataService()); viewModel.SubmitCommand.Execute(null); }
  20. 20. Command line tool http://statlight.codeplex.com Possible to integrate in TFS build Continuous mode
  21. 21. http://silverlight.codeplex.com http://statlight.codeplex.com Timmy Kokke info@timmykokke.com http://twitter.com/sorskoot http://www.timmykokke.com Silverlight and Expression Usergroup http://www.sixin.nl 9 November next meeting !

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