timmy kokke silverlight / asp.net developer unit4 internet solutions expression blend mvp

Unit testing MVVM in Silverlight

Timmy Kokke

Silverlight / ASP.Net DeveloperUNIT4 Internet SolutionsExpression Blend MVP

Agenda

Basics of MVVMUnit TestingSilverlight Unit Testing frameworkStatLight

Basic MVVM

Model

View

ViewModel

Basic MVVM

Model

View

ViewModel

Basic MVVM

Model

View

ViewModel

Basic MVVM

Model

View

ViewModel

Basic MVVM

Model

View

ViewModel

DatabindingCommands

MethodsEvents

Unit Testing

Unit tests are

consistent, isolated, fast and repeatable

Unit Testing

Test only small units of workTestName = Requirement1 Assert per testSelf explanatoryReadability over Maintainability

Silverlight Unit Test Framework

Silverlight Toolkit http://silverlight.codeplex.com

Runs in browser, no support for MsTest

Writing Tests

Demo

Writing Tests

[TestClass]public class ExampleTests{

[TestMethod] public class Adding_1_And_1_Should_Be_2(){ int result = 1 + 1; Assert.AreEqual(2, result); }}

Serv

er

Silv

erlig

ht C

lien

t

Demo Project

GamesViewModel

GamesView

GamesDataService

WCF Ria Service

Database

Mvvm Demo Project

Demo

Un

it Test

Serv

er

Silv

erl

igh

t C

lien

tDemo Project

GamesViewModel

GamesView

GamesDataService

WCF Ria Service

Database

TestGamesDataService

IGamesDataService

GamesViewModelTests

Silverlight Unit testing

Demo

[Tag(“anything”)]

[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);}

[Description(“what’s goin’ on”)]

[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));}

[Asynchonous]

[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);}

[Bug(“Known failure”)][WorkItem(1234)][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);}

[TimeOut(250)]

[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);}

[ExpectedException(typeof(Exception))]

[TestMethod][ExpectedException(typeof(ArgumentNullException))]public void Executing_SubmitCommand_With_Null_Should_Throw_Exception(){ RatingViewModel viewModel =      new RatingViewModel(new TestGamesDataService());

    viewModel.SubmitCommand.Execute(null);}

StatLight

Command line toolhttp://statlight.codeplex.comPossible to integrate in TFS buildContinuous mode

StatLight

Demo

Unit testing MVVM in Silverlighthttp://silverlight.codeplex.comhttp://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 !