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Frictionless WCF service consumption in Silverlight - Part 3: Benefits of transparent asynchrony with respect to unit testing

, 26 May 2011
Simplifying unit testing of View Models which use asynchronous WCF service calls.
FrictSLUnitTest.zip
Source
Sample.Silverlight.WCF
Infrastructure
Actions
Services
Properties
Shared
Utility
Views
Sample.Silverlight.WCF.Tests
Properties
Sample.Silverlight.WCF.Tests.Clumsy
Properties
DataSources
Sample.Silverlight.WCF.Web.Services.Task.datasource
Service References
ServiceReference1
configuration.svcinfo
configuration91.svcinfo
Reference.svcmap
TaskService.disco
TaskService.wsdl
ServiceReferences.ClientConfig
Sample.Silverlight.WCF.Tests.Clumsy.Web
Properties
Sample.Silverlight.WCF.Web
Properties
Services
TaskService.svc
Tools
NUnit
nunit.framework.dll
nunit.silverlight.dll
Rhino.Mocks
Castle.Core-Silverlight.dll
Castle.DynamicProxy-Silverlight.dll
Rhino.Mocks 3.5.Silverlight.dll
using System.Collections.ObjectModel;

using Microsoft.Silverlight.Testing;
using Microsoft.VisualStudio.TestTools.UnitTesting;

using Sample.Silverlight.WCF.Infrastructure;
using Sample.Silverlight.WCF.Web.Services;
using Sample.Silverlight.WCF.Tests.Clumsy.ServiceReference1;

namespace Sample.Silverlight.WCF.Tests.Clumsy
{
	public class TaskManagementViewModel : ViewModelBase
	{
		Task selected;

		public TaskManagementViewModel()
		{
			Tasks = new ObservableCollection<Task>();
		}

		public ObservableCollection<Task> Tasks
		{
			get; private set;
		}

		public Task Selected
		{
			get { return selected; }
			set
			{
				selected = value;
				NotifyOfPropertyChange(() => Selected);
			}
		}

		public void Activate()
		{
			var service = new TaskServiceClient();

			service.GetAllCompleted += (o, args) =>
			{
				if (args.Error != null)
					return;

				foreach (Task each in args.Result)
				{
					Tasks.Add(each);
				}

				Selected = Tasks[0];
			};
			
			service.GetAllAsync();
		}
	}

	[TestClass]
	public class TaskManagementViewModelFixture : SilverlightTest
	{
		[TestMethod]
		[Asynchronous]
		public void Should_query_service_for_current_tasks_on_first_activation()
		{
			// arrange
			var model = new TaskManagementViewModel();

			// this will be used as a wait handle for test completion 
			bool eventRaised = false;
			model.PropertyChanged += (o, args) =>
			{
				if (args.PropertyName == "Selected")
					eventRaised = true;
			};

			EnqueueConditional(() => eventRaised);

			// act
			model.Activate();

			// assert
			EnqueueCallback(() =>
			{
				Assert.AreEqual(2, model.Tasks.Count);
				Assert.AreSame(model.Tasks[0], model.Selected);
			});

			EnqueueTestComplete();
		}
	}
}

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This article, along with any associated source code and files, is licensed under The MIT License

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About the Author

Yevhen Bobrov
Software Developer http://blog.xtalion.com
Ukraine Ukraine
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Web03 | 2.8.140921.1 | Last Updated 26 May 2011
Article Copyright 2011 by Yevhen Bobrov
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