Create Unit Test Methods for Entities using Shim and Fakes in ASP.NET

See following steps: 

Step 1: Create Request object for method.

Request object should have all necessary input parameters to pass.

Step 2: Create a response object.

Response object should have all necessary values which will cover test method.

Step 3: Create a Shim client instance.

ShimClientClassName.Constructor = (X) => { new ShimClientClassName (); };

Step 4: Create a context for that particular client.

Here ClientServiceName is a TserviceClient And ClientClassName is a TserviceTypeClient.

var systemContext = EntityFakeHelper.StubSystemContext<ClientServiceName, ClientClassName>();

Step 5: Create Shim response for that particular client method.

Add Fakes client Namespace. (goto client class).

Append “Shim” before class name e.g ShimClientClassName.

Find method name and click ctrl space.

ShimClientClassName.AllInstances.MethodName = (x, y) => Task.FromResult(objResp);

Add fake logging.

Step 6: Call method you want to unit test.

var result = await service.ResetPasswordAsync(request);

Step 7: Assert based on the response or method for we writing unit test.

Assert.AreEqual("123", result.ResultCode);

Refer below example:

[TestMethod]

public async Task ResetPassword_SuccessIsNo() {
    using(ShimsContext.Create()) {
        //Arrange
        BusinessServiceRequest < AccountPasswordResetRequest > request = new BusinessServiceRequest < AccountPasswordResetRequest > ();
        request.InteractionRecordCategory1 = "";
        request.InteractionRecordCategory2 = "";
        request.InteractionRecordId = "";
        request.Payload = new AccountPasswordResetRequest()

        {
            Guid = "BE0E-4CDE-B336-8FE455555444",
            Password = "P@ssw0rd123",
            PasswordConfirmation = "Psswrd1234",
            UserID = "[email protected]"
        };
        ResetCustomerPasswordResponse objResp = new ResetCustomerPasswordResponse();

        ShimPortTypeClient.Constructor = (X) = > {
            new ShimPortTypeClient();
        };
        var systemContext = EntityFakeHelper.StubSystemContext < PortType,
            ShimPortTypeClient > ();

        ShimShimPortTypeClient.AllInstances.ResetCustomerPasswordAsyncResetCustomerPasswordRequest = (x, y) = > Task.FromResult(objResp);

        //Mock ISystemContext

        AuthenticationService service = new AuthenticationService(systemContext);#region Fake Logging

        Microsoft.Practices.EnterpriseLibrary.ExceptionHandling.Fakes.ShimExceptionPolicy.HandleExceptionExceptionString = (a1, a2) = > {
            return true;
        };

        Common.Diagnostics.Fakes.ShimDiagnosticLogger.AllInstances.WriteTraceDiagnosticCategoryTraceEventTypeDiagnosticCorrelationExceptionStringObjectArray = (a1, a2, a3, a4, a5, a6, a7) = > {
            return;
        };

        #endregion

        //Act

        var result = await service.ResetPasswordAsync(request);
        //Assert

        Assert.AreEqual("1234", result.ResultCode);

        Assert.AreEqual("Shim return this code", result.ResultDescription);

    }

}