public void TestSetSingleToneMode() { // Define what message you expect Message call = new Message(); call.Add(selectBothChannels); call.Add(setSingleTone); using (mocks.Ordered) { Expect.Once.On(mockDevice).Method("SendDataToEP2").With(call.ToArray()); } dds.SetMode("singletone"); mocks.VerifyAllExpectationsHaveBeenMet(); }