Mock unit testing

Mock unit testing 

Mock unit testing is very useful for developer, but my point of view its fake unit testing, its making us foolish.
Lets see how it is...

I have created on console application in visual studio and try to explain two cases as below...

Case1

Case1: I have created Case1 folder in "UnitTestCaseProject" and write below two classes. 

namespace UnitTestCaseProject.Case1
{
    public class checkEmployee
    {
        public virtual Boolean checkEmp()
        {
            throw new NotImplementedException();
            //return true;
        }
    }
}

namespace UnitTestCaseProject.Case1
{
    public class processEmployee
    {
        public bool insertEmployee(checkEmployee objtmp)
        {
            objtmp.checkEmp();
            return true;
        }
    }
}

Case2

I have created Case2 folder in "UnitTestCaseProject" and write below three classes.

namespace UnitTestCaseProject.Case2
{
    public interface IGetDataRepository
    {
        string GetNameById(int id);
    }
}

namespace UnitTestCaseProject.Case2
{
    public class EmployeeRepository : IGetDataRepository
    {
        public string GetNameById(int id)
        {
            string name;
            if (id == 1)
            {
                name = "Excellent";
            }
            else if (id == 2)
            {
                name = "Expert";
            }
            else
            {
                name = "Not Found";
            }
            return name;
        }
    }
}

namespace UnitTestCaseProject.Case2
{
    public class Implementation1
    {
        private readonly IGetDataRepository _data;
        public Implementation1(IGetDataRepository data)
        {
            _data = data;
        }

        public string GetNameById(int id)
        {
            return _data.GetNameById(id);
        }
    }
}

Test Project

Now, I have added new test project in solution with name "UnitTestCaseProject.Test" and write unit test cases for above two cases.


I have installed "Moq" packages using manage nuget packages...

namespace UnitTestCaseProject.Test
{
    [TestClass]
    public class Case1Test
    {
        [TestMethod]
        public void insertEmployeeTestSuccess()
        {
            Mock<checkEmployee> chk = new Mock<checkEmployee>();
            chk.Setup(x => x.checkEmp()).Returns(true);

            processEmployee obje = new processEmployee();
            Assert.AreEqual(obje.insertEmployee(chk.Object), true);
        }
    }
}


namespace UnitTestCaseProject.Test
{
    [TestClass]
    public class Cast2Test
    {
        [TestMethod]
        public void TestMethod2()
        {
            var mock = new Mock<IGetDataRepository>();
            mock.Setup(p => p.GetNameById(1)).Returns("demo");
            Implementation1 home = new Implementation1(mock.Object);
            string result = home.GetNameById(1);
            Assert.AreEqual("demo", result);
        }
    }
}

While I run the above two unit test cases, it gives me success result.

Real Implementation and usage

Now, below code is actual implementation in our project "UnitTestCaseProject".

namespace UnitTestCaseProject
{
    class Program
    {
        static void Main(string[] args)
        {
            processEmployee processEmployee = new processEmployee();
            checkEmployee checkEmployee = new checkEmployee();
            var result = processEmployee.insertEmployee(checkEmployee);
            Console.WriteLine(result);
        }
    }
}

Now, if I run the project it gives me an error in actual usage, that should not give me any error while I already tested with unit test cases. So, you can see that it is not useful in our real project or application.

I suggest while you deploy project or application in Live environment, then we should write test cases with test environment.

Hope this will help you and save your time.

Enjoy !!!

:)