Mock abstract protected method

Question

I have an abstract class:

public abstract class MyClass
{
    protected abstract bool IsSavable();

    protected bool IsExecutable()
    {
        //New mode or edit mode
        if (ViewMode == ViewMode.New || ViewMode == ViewMode.Edit)
        {
            return IsSavable();
        }

        //Search mode
        if (ViewMode == ViewMode.Search)
        {
            return true;
        }

        return false;
    }
}

I would like to unit test this class. Therefor I need to mock the "IsSavable" method. It should always return "true".

I know how to mock my abstract class with Moq. But how can I mock my abstract protected method so it returns true?

The function IsSavable is called in my abstract class by a concrete method (IsExecuteable). I would like to test this method. I know that most of you will recommend to test both in the class where "IsSavable" is implemented. Unfortunately this will be a lot of classes and I would like to test my method IsExecutable only once.

Answer 1

I would like to unit test this class. Therefor I need to mock the "IsSavable" method. It should always return "true".

No, that's a non-sequitur. You can just create a subclass which does what you want:

// Within your test code
class MyClassForTest : MyClass
{
    // TODO: Consider making this a property 
    protected override bool IsSavable()
    {
        return true;
    }
}

Then when you want to run a test, create an instance of MyClassForTest instead of just MyClass.

Personally I prefer to use mocking frameworks for dependencies rather than the classes I'm testing.