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The Unit Test of Silverlight Applications with Asynchronous Service Callbacks

, 18 Feb 2011 CPOL 27.1K 723 17
This article presents an example on unit testing of Silverlight applications with asynchronous service callbacks.
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SilverlightUnitTestExample.zip
SilverlightUnitTestExample
SilverlightApplication
SilverlightApplicationUnitTest
Bin
Debug
Properties
SilverlightApplicationUnitTest.csproj.user
Bin
Debug
Models
Properties
Service References
StudentService
configuration.svcinfo
configuration91.svcinfo
Reference.svcmap
SilverlightApplication.StudentService.Student.datasource
StudentService.disco
StudentService.wsdl
ServiceReferences.ClientConfig
SilverlightApplication.csproj.user
Utilities
ViewModels
SilverlightHostWebApplication
bin
ClientBin
Properties
Scripts
SilverlightHostWebApplication.csproj.user
StudentService.svc
Styles
SilverlightUnitTestExample.suo
using System;
using Microsoft.Silverlight.Testing;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using SilverlightApplication.ViewModels;

namespace SilverlightApplicationUnitTest
{
    [TestClass]
    public class MainPageViewModelTests: SilverlightTest
    {
        [TestMethod]
        public void ViewModelInitiation()
        {
            MainPageViewModel vm = new MainPageViewModel();
            Assert.IsTrue(vm.StudentList == null, 
                "At view model initiation, StudentList should be null");
            Assert.IsTrue(vm.GetStudentWCFCommand != null,
                "At view model initiation, GetStudentWCFCommand should be initiated");
            Assert.IsTrue(vm.GetStudentWCFWrongMethodCommand != null,
                "At view model initiation, GetStudentWCFWrongMethodCommand should be initiated");
        }

        [TestMethod]
        [Asynchronous]
        public void AsynchronousWCFCallWithGetStudentWCFCommand()
        {
            MainPageViewModel vm = new MainPageViewModel();
            bool done = false;
            vm.AsyncCallbackCompleted += (() => done = true);

            EnqueueCallback(() => vm.GetStudentWCFCommand.Execute(null));
            EnqueueConditional(() => done);
            EnqueueCallback(() => Assert.IsNotNull(vm.StudentList,
                "No student retreived from the WCF service"));
            EnqueueCallback(() => Assert.IsTrue(vm.StudentList.Count == 10,
                "The number of the students should be 10."));

            EnqueueTestComplete();
        }

        [TestMethod]
        [Asynchronous]
        public void AsynchronousWCFCallWithGetStudentWCFWrongMethodCommand()
        {
            MainPageViewModel vm = new MainPageViewModel();
            bool done = false;
            vm.AsyncCallbackCompleted += (() => done = true);

            EnqueueCallback(() => vm.GetStudentWCFWrongMethodCommand.Execute(null));
            EnqueueConditional(() => done);
            EnqueueCallback(() => Assert.IsNotNull(vm.StudentList,
                "No student retreived from the WCF service"));
            EnqueueCallback(() => Assert.IsTrue(vm.StudentList.Count == 10,
                "The number of the students should be 10. Problem is captured by the unit test."));

            EnqueueTestComplete();
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Dr. Song Li

United States United States
I have been working in the IT industry for some time. It is still exciting and I am still learning. I am a happy and honest person, and I want to be your friend.

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