Moq可以模拟HubConnection，但RhinoMocks不能

我正在查看SignalR的单元测试，并注意到其中一个测试使用Moq创建模拟HubConnection:

[Fact]
public void HubCallbackClearedOnFailedInvocation()
{
    var connection = new Mock<HubConnection>("http://foo");
    var tcs = new TaskCompletionSource<object>();
    tcs.TrySetCanceled();
    connection.Setup(c => c.Send(It.IsAny<string>())).Returns(tcs.Task);
    var hubProxy = new HubProxy(connection.Object, "foo");
    var aggEx = Assert.Throws<AggregateException>(() => { hubProxy.Invoke("foo", "arg1").Wait(); });
    var ex = aggEx.Unwrap();
    Assert.IsType(typeof(TaskCanceledException), ex);
    Assert.Equal(connection.Object._callbacks.Count, 0);
}

然而，当我尝试用一个稍微不同的mock框架(RhinoMocks)做同样的事情时，它抱怨该方法不是虚拟的:

[Test]
public void ShouldCreateBrokerWithHubConnection()
{
    //Arrange
    var url = "http://localhost6790";
    var hubProxy = MockRepository.GenerateMock<IHubProxy>();
    var hubConnection = MockRepository.GenerateMock<HubConnection>(url);
    hubConnection.(c => c.CreateHubProxy("ArtemisClientHub")).Return(hubProxy);
    ... (more code)
 }

System.InvalidOperationException : Invalid call, the last call has been used or no call has been made (make sure that you are calling a virtual (C#) / Overridable (VB) method).

这只是RhinoMocks与Moq这样的新库相比的一个缺点吗?