Unit testing and MVVM in Silverlight
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The document discusses unit testing for Silverlight applications. It provides an overview of model-view-viewmodel (MVVM) patterns, and examples of writing unit tests for a Silverlight application using the StatLight testing framework. Examples include tests for view models, models, and data services using common unit testing assertions and attributes.
![[TestClass]
public class ExampleTests{
[TestMethod]
public class Adding_1_And_1_Should_Be_2(){
int result = 1 + 1;
Assert.AreEqual(2, result);
}
}](https://image.slidesharecdn.com/unittestingmvvm-101109053302-phpapp01/85/Unit-testing-and-MVVM-in-Silverlight-12-320.jpg)
![[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);
}](https://image.slidesharecdn.com/unittestingmvvm-101109053302-phpapp01/85/Unit-testing-and-MVVM-in-Silverlight-17-320.jpg)
![[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));
}](https://image.slidesharecdn.com/unittestingmvvm-101109053302-phpapp01/85/Unit-testing-and-MVVM-in-Silverlight-18-320.jpg)
![[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);
}](https://image.slidesharecdn.com/unittestingmvvm-101109053302-phpapp01/85/Unit-testing-and-MVVM-in-Silverlight-19-320.jpg)
![[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);
}](https://image.slidesharecdn.com/unittestingmvvm-101109053302-phpapp01/85/Unit-testing-and-MVVM-in-Silverlight-20-320.jpg)
![[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);
}](https://image.slidesharecdn.com/unittestingmvvm-101109053302-phpapp01/85/Unit-testing-and-MVVM-in-Silverlight-21-320.jpg)
![[TestMethod]
[ExpectedException(typeof(ArgumentNullException))]
public void Executing_SubmitCommand_With_Null_Should_Throw_Exception()
{
RatingViewModel viewModel =
new RatingViewModel(new TestGamesDataService());
viewModel.SubmitCommand.Execute(null);
}](https://image.slidesharecdn.com/unittestingmvvm-101109053302-phpapp01/85/Unit-testing-and-MVVM-in-Silverlight-22-320.jpg)
Unit testing and MVVM in Silverlight
- 1. Timmy Kokke Silverlight / ASP.Net Developer UNIT4 Internet Solutions Expression Blend MVP
- 2. Basics of MVVM Unit Testing Silverlight Unit Testing framework StatLight
- 8. Unit tests are consistent, isolated, fast and repeatable
- 9. Test only small units of work TestName = Requirement 1 Assert per test Self explanatory Readability over Maintainability
- 10. Silverlight Toolkit http://silverlight.codeplex.com Runs in browser, no support for MsTest
- 12. [TestClass] public class ExampleTests{ [TestMethod] public class Adding_1_And_1_Should_Be_2(){ int result = 1 + 1; Assert.AreEqual(2, result); } }
- 17. [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); }
- 18. [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)); }
- 19. [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); }
- 20. [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); }
- 21. [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); }
- 22. [TestMethod] [ExpectedException(typeof(ArgumentNullException))] public void Executing_SubmitCommand_With_Null_Should_Throw_Exception() { RatingViewModel viewModel = new RatingViewModel(new TestGamesDataService()); viewModel.SubmitCommand.Execute(null); }
- 23. Command line tool http://statlight.codeplex.com Possible to integrate in TFS build Continuous mode
- 25. 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 !
Editor's Notes
- #5: View => presentation of the data. Xaml
- #6: ViewModel => the glue between View and Model.
- #7: Model => domain object. the actual data/information. Example: contact (name, phone number, address)
- #8: ViewModel -> Binding -> View -> Binding/Commands/Behaviors -> ViewModel ViewModel -> Method -> Model -> Events/Delegates -> ViewModel All client-server communication is async in Silverlight… makes testing a little more difficult. Testing mainly ViewModel… Sometimes a little View
- #9: Let op met service calls of andere externe afhankelijkheden. Dit zijn Integration Tests.
- #10: Test only small units of work TestName = Requirement 1 Assert per test Self explanatory Readability over Maintainability Naamgeving duidelijk -> underscores etc. Schrijf parameters als named parameters Vermijd dubbele code (DRY) -> gebruik functies als Make_GameViewModel
- #11: Testframework is part of Silverlight toolkit Runs inside the browser, tools available to run from commandline (Statlight)… later more about this. Test classes can inherit from SilverlightTest -> Not supported in MSTest in visual studio (yet?) CodeCoverage is not available yet. Integratie in TFS build process wel mogelijk, via custom extension
- #12: Start new Silverlight Project, add test project. Write some useless tests to demonstrate writing tests… Assert.AreEqual(1+1,3) Attributes: [TestClass] [TestMethod] 2e demo… Flow van attributes en test methoden… file importeren met example… breakpoints plaatsen [AssemblyInitialize] [AssemblyCleanup] -> 1x per assembly [ClassInitialize] [ClassCleanup] -> 1x per class [TestInitialize] [TestCleanup] -> 1x per test
- #14: Client is equal for Publisher and Ratings.
- #15: Show the demo project running for a sec
- #17: Demo of the various attributes and different unit tests. [Tag] [Description] [Asynchronous] [Bug] [WorkItem] [TimeOut] [ExpectedException]
- #20: Silverlight = asynchronous Many asynchronous tests Tests ends when EnqueueTestComplete is called
- #22: To demonstrate -> uncomment // Thread.Sleep(TimeSpan.FromSeconds(5)); in TestPublishersDataService
- #25: Demo of statlight Running commandline single and continuous
- #26: Sixin Meeting (9 nov) about Designer-Developer lifecycle and userstories