Testing non virtual public methods

[carzaza]

Hello,

I'm trying to unit test a public class that contains an orchestrator method and a series of methods, which can be called by the orchestrator but also externally:

public class ClassForTesting
{
    public void MethodA()
    {
        this.MethodA();

        this.MethodB();
    }

    public void MethodB()
    {
        // Do some stuff.
    }

    public void MethodC()
    {
        // Do some stuff.
    }
}

My intention is to perform a test like the following one, but it can not be done without virtual methods:

// Arrange.
Mock<ClassForTesting> classForTestingMock = new Mock<ClassForTesting>()
{
    CallBase = true,
};

classForTestingMock.Setup(m => m.MethodB());
classForTestingMock.Setup(m => m.MethodC());

// Act.
classForTestingMock.Object.MethodA();

// Assert.
classForTestingMock.Verify(m => m.MethodB(), Times.Once());
classForTestingMock.Verify(m => m.MethodC(), Times.Once());
classForTestingMock.VerifyNoOtherCalls();

Is there any alternative for testing this? Does any approach exist that I am not considering?

I have searched across Stack Overflow and the only alternative is using other frameworks, this is the reason why I am asking this directly in your github instead of in SO.

Thanks in advance

[stakx]

AFAIK, the only tools that can intercept/replace non-overridable methods are those based on the .NET runtime's unmanaged profiling API (and Moq isn't one of those). So yes, either use a different mocking library, or change your code so it is more easily testable.