Mocking abstract class results in AccessViolationException.

[Geert]

Hi all,

I have the following class (simplified)

public abstract class AbstractStateMachine
{
     public void DoClose()
      {
        //do something
         close();
      }
      public abstract void close();
}

I want to test if the close() method is called, so I thought I could do the following:

[TestMethod]
public void TestMethod1()
{
    AbstractStateMachine sm = Mock.Create<AbstractStateMachine>(Behavior.CallOriginal);
    Mock.Arrange(() => sm.close()).DoNothing().MustBeCalled();
    sm.DoClose();
}

As a result, I get a AccessViolationException in the sm.DoClose() method.
What am I doing wrong?

[Ricky]

Hi Geert,

Thanks again for contacting us. You are getting access violation exception because DoClose is a private method and you are trying to access it directly from test method using sm.DoClose(). However, you can write it in the following way and the test will work as expected:

AbstractStateMachine sm = Mock.Create<AbstractStateMachine>(Behavior.CallOriginal);

Mock.Arrange(() => sm.close()).DoNothing().MustBeCalled();

sm.close();

Mock.Assert(sm);

Hope this solves your issue.

Kind regards,
Mehfuz
the Telerik team

[Geert]

Hi there,

Sorry, that was a typo in my original mail. The DoClose() was a public method in my original code. The whole idea was to do partial mocking, i.e. only mock the abstract functions of my abstract base class.

I switched to Moq (using CallBase=true), and everything works fluently there.

[Ricky]

Hi Geert,

Thanks again for your reply. I have tried the test with public DoClose method and its working as well. I have also attached the test project to let you have a look.

In addition, please make sure that you are using the latest build. You can easily get one from NuGet with using install-package JustMock command.

Kind Regards,
Mehfuz
the Telerik team