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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 System.Collections.Generic;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

namespace SilverlightHostWebApplication
{
    [DataContract]
    public class Student
    {
        [DataMember(Order = 0)]
        public string ID { get; set; }
        [DataMember(Order = 1)]
        public string Name { get; set; }
        [DataMember(Order = 2)]
        public DateTime EnrollmentDate { get; set; }
        [DataMember(Order = 3)]
        public int Score { get; set; }
        [DataMember(Order = 4)]
        public string Gender { get; set; }
    }

    [ServiceContract]
    public class StudentService
    {
        [OperationContract]
        public List<Student> GenerateStudents(int NoOfStudents)
        {
            // This is the correct method.
            // It returns exactly the same number of students
            // as requested.
            return CreateStudentsList(NoOfStudents);
        }

        [OperationContract]
        public List<Student> GenerateStudentsWithError(int NoOfStudents)
        {
            // This method has an artificial error.
            // It is used to generate a failure in the unit test.
            // The number of students generated is (NoOfStudents - 1)
            return CreateStudentsList(NoOfStudents - 1);
        }

        private List<Student> CreateStudentsList(int NoOfStudents)
        {
            List<Student> students = new List<Student>();

            Random rd = new Random();
            for (int i = 1; i <= NoOfStudents; i++)
            {
                int score = Convert.ToInt16(60 + rd.NextDouble() * 40);
                students.Add(new Student()
                {
                    ID = "ID No." + i.ToString(),
                    Name = "Student Name " + i.ToString(),
                    EnrollmentDate = DateTime.Now,
                    Score = score,
                    Gender = (score >= 80) ? "Famle" : "Male"
                });
            }

            return students;
        }
    }
}

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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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