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

, 26 May 2011 MIT
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;
using System.Collections.ObjectModel;
using System.ServiceModel;

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

using Rhino.Mocks;

using Sample.Silverlight.WCF.Infrastructure;
using Sample.Silverlight.WCF.Web.Services;

using ITaskService = Sample.Silverlight.WCF.Tests.Clumsy.ServiceReference1.ITaskService;

namespace Sample.Silverlight.WCF.Tests.Clumsy
{
	public class TaskManagementViewModelWithMocking : ViewModelBase
	{
		Task selected;
		Func<ITaskService> serviceFactory;

		public TaskManagementViewModelWithMocking(Func<ITaskService> serviceFactory)
		{
			this.serviceFactory = serviceFactory;
			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 = serviceFactory();

			service.BeginGetAll(ar =>
			{
				try
				{
					var all = service.EndGetAll(ar);

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

					Selected = Tasks[0];
				}
				catch (FaultException exc)
				{
					// ... some exception handling code ...
				}
			}, null);
		}
	}

	[TestClass]
	public class TaskManagementViewModelWithMockingFixture : SilverlightTest
	{
		[TestMethod]
		public void Should_query_service_for_current_tasks_on_first_activation()
		{
			// arrange
			var expectedData = new ObservableCollection<Task>
			{
				CreateTask("Task1"), 
				CreateTask("Task2")
			};

			var mock = MockRepository.GenerateMock<ITaskService>();
			var asyncResult = MockRepository.GenerateMock<IAsyncResult>();

			// need to setup expectations for both APM methods
			mock.Expect(service => service.BeginGetAll(null, null))
				.IgnoreArguments().Return(asyncResult);

			mock.Expect(service => service.EndGetAll(asyncResult))
				.Return(expectedData);

			var model = new TaskManagementViewModelWithMocking(() => mock);

			// act
			model.Activate();

			// we need this to actually complete the call
			Callback(mock, service => service.BeginGetAll(null, null))(asyncResult);

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

		static AsyncCallback Callback<TService>(TService mock, Action<TService> method)
		{
			var arguments = mock.GetArgumentsForCallsMadeOn(method);
			return (AsyncCallback)arguments[0][0];
		}

		static Task CreateTask(string description)
		{
			return new Task {Id = new Guid(), Description = description};
		}
	}
}

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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 | 2.8.141220.1 | Last Updated 26 May 2011
Article Copyright 2011 by Yevhen Bobrov
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