How to unit test delegate was received in base class method?

I currently have a base service class that all my services extend. This is what one of the methods look like:

   protected internal virtual T PerformServiceOperation<T>(Func<T> func)
        {
            try
            {
                return func.Invoke();
            }

            ...
        }

In the derived classes I call the method like this:

    public AddGuestResponse AddGuest(AddGuestRequest addGuestRequest)
    {
        return PerformServiceOperation(() => AddGuestLogic(addGuestRequest));
    }

I want to test AddGuest and ensure "AddGuestLogic" is being passed as a parameter in the base method? How do I achieve this with nSubstitute and nUnit. I don't think its possible?