How do you mock a Sealed class?

Question

Mocking sealed classes can be quite a pain. I currently favor an Adapter pattern to handle this, but something about just keeps feels weird.

So, What is t

Answer 1

It is perfectly reasonable to mock a sealed class because many framework classes are sealed.

In my case I'm trying to mock .Net's MessageQueue class so that I can TDD my graceful exception handling logic.

If anyone has ideas on how to overcome Moq's error regarding "Invalid setup on a non-overridable member", please let me know.

code:

    [TestMethod]
    public void Test()
    {
        Queue messages = new Queue();
        Action sendDelegate = msg => messages.Enqueue(msg);
        Func receiveDelegate =
            (v1, v2) =>
            {
                throw new Exception("Test Exception to simulate a failed queue read.");
            };

        MessageQueue mockQueue = QueueMonitorHelper.MockQueue(sendDelegate, receiveDelegate).Object;
    }
    public static Mock MockQueue
                (Action sendDelegate, Func receiveDelegate)
    {
        Mock mockQueue = new Mock(MockBehavior.Strict);

        Expression> sendMock = (msmq) => msmq.Send(It.IsAny()); //message => messages.Enqueue(message);
        mockQueue.Setup(sendMock).Callback(sendDelegate);

        Expression> receiveMock = (msmq) => msmq.Receive(It.IsAny(), It.IsAny());
        mockQueue.Setup(receiveMock).Returns(receiveDelegate);

        return mockQueue;
    }