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The Unit Test of Silverlight Applications with Asynchronous Service Callbacks

, 18 Feb 2011
This article presents an example on unit testing of Silverlight applications with asynchronous service callbacks.
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 SilverlightApplication.Utilities;
using SilverlightApplication.StudentService;
using System.Collections.Generic;
using SilverlightApplication.Models;

namespace SilverlightApplication.ViewModels
{
    public class MainPageViewModel : ViewModelBase
    {
        // Public properties
        private List<Student> studentList = null;
        public List<Student> StudentList
        {
            get { return studentList; }
            private set
            {
                studentList = value;
                NotifyPropertyChanged("StudentList");
            }
        }

        // Public commands
        public RelayCommand GetStudentWCFCommand { get; private set; }
        private void GetStudentWCF()
        {
            StudentModel model = new StudentModel();
            model.GetStudents(10, (s, r) =>
            {
                StudentList = (List<Student>)r.Result;

                // This is used for unit testing
                // It has no effect to the normal program flow.
                InformCallbackCompleted();
            });
        }

        public RelayCommand GetStudentWCFWrongMethodCommand { get; private set; }
        private void GetStudentWCFWrongMethod()
        {
            StudentModel model = new StudentModel();
            model.GetStudentsWithError(10, (s, r) =>
            {
                StudentList = (List<Student>)r.Result;

                // This is used for unit testing
                // It has no effect to the normal program flow.
                InformCallbackCompleted();
            });
        }

        // Commands should be initiated in this method
        private void WireCommands()
        {
            GetStudentWCFCommand = new RelayCommand(GetStudentWCF);
            GetStudentWCFCommand.IsEnabled = true;

            GetStudentWCFWrongMethodCommand = new RelayCommand(GetStudentWCFWrongMethod);
            GetStudentWCFWrongMethodCommand.IsEnabled = true;
        }

        // Constructor
        public MainPageViewModel() : base()
        {
            WireCommands();
        }
    }
}

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License

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

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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