Mocked Method not returning correct object

[Chris]

I have a unit test that is attempting to test a very simple method.  The method under test simply calls two other methods (interface methods that are marked as virtual in the implementation).  I use the following code in the unit test....

IEnumerable<byte> passedMessage1 = new byte[16];

            Mock.Arrange(() => MessageOperationsMock.InsertNetworkAddressIntoMessage
                (Target.PrimaryReportingAddress, passedMessage1, 3))
                .DoNothing()
                .Returns(passedMessage1)
                .OccursOnce();

            Mock.Arrange(() => MessageOperationsMock.InsertNetworkAddressIntoMessage
                (Target.AlternateReportingAddress, passedMessage1, 25))
                .DoNothing()
                .Returns(passedMessage1)
                .OccursOnce();

            Target.PrimaryReportingAddress = LocalTestScenarios.TestIPAddress1;
            Target.AlternateReportingAddress = LocalTestScenarios.TestIPAddress2;

            Target.InsertNetworkAddressesIntoPart(passedMessage1);

            Mock.Assert(MessageOperationsMock);

The Target method is....

internal virtual IEnumerable<byte> InsertNetworkAddressesIntoPart(IEnumerable<byte> messageBeingCreated)
        {
            messageBeingCreated = MessageOperationsHelper.InsertNetworkAddressIntoMessage(PrimaryReportingAddress, messageBeingCreated, 3);
            messageBeingCreated = MessageOperationsHelper.InsertNetworkAddressIntoMessage(AlternateReportingAddress, messageBeingCreated, 25);

            return messageBeingCreated;
        }

and here is the mocking setup....

protected HardCodedMonitoringSettingsEntity Target;
        protected IDependencyInjection InjectorMock;
        protected IValidationOperations ValidatorMock;
        protected IMessageOperations MessageOperationsMock;

        [SetUp]
        public void InitializeBase()
        {
            Target = Mock.Create<HardCodedMonitoringSettingsEntity>(Behavior.CallOriginal);
            InjectorMock = Mock.Create<IDependencyInjection>();
            ValidatorMock = Mock.Create<IValidationOperations>();
            MessageOperationsMock = Mock.Create<IMessageOperations>();

            Target.DependencyInjector = InjectorMock;
            Target.ValidationOperationsHelper = ValidatorMock;
            Target.MessageOperationsHelper = MessageOperationsMock;
        }

The problem is the test says that expected called once but was called 0 times.  What I see when I debug the code is that my passedMessage variable goes from a byte array to some other type of object (goes from saying byte[16] to count = 0 after the first method is called.

Any thoughts?

[Kaloyan]

Hello Chris,

 Thank you for contacting Telerik support.

 There is one thing I was able to notice in your test method:

Mock.Arrange(() => MessageOperationsMock.InsertNetworkAddressIntoMessage
                (Target.PrimaryReportingAddress, passedMessage1, 3))
                .DoNothing()
                .Returns(passedMessage1)
                .OccursOnce();

            Mock.Arrange(() => MessageOperationsMock.InsertNetworkAddressIntoMessage
                (Target.AlternateReportingAddress, passedMessage1, 25))
                .DoNothing()
                .Returns(passedMessage1)
                .OccursOnce();

 You are using the "DoNothing()" method before "Returns()". We do not recommend this approach anymore. Using the newest version of JustMock, your test should look like this:

Mock.Arrange(() => MessageOperationsMock.InsertNetworkAddressIntoMessage
                (Target.PrimaryReportingAddress, passedMessage1, 3))
                .Returns(passedMessage1)
                .OccursOnce();

            Mock.Arrange(() => MessageOperationsMock.InsertNetworkAddressIntoMessage
                (Target.AlternateReportingAddress, passedMessage1, 25))
                .Returns(passedMessage1)
                .OccursOnce();

 The "DoNothing()" method is applicable only for methods without a return value and property sets. You can read more about it here:
 - http://www.telerik.com/help/justmock/basic-usage-mock-do-nothing.html

 Also, I would recommend you to update your JustMock references inside your solution.

 Let me know if this solves your problem.

Kind regards,
Kaloyan
the Telerik team