public async Task TestReceiveMessagingChannelReject() { IProtocolGatewayMessage msg = null; IMessageConverter <IProtocolGatewayMessage> messageConverter = ProtocolGatewayMessageConverter.Value; var dp = new DeviceProxy(Channel.Object, MockIdentity, messageConverter, ByteBufferConverter); var cloudProxy = new Mock <ICloudProxy>(); cloudProxy.Setup(d => d.SendFeedbackMessageAsync(It.IsAny <string>(), It.IsAny <FeedbackStatus>())).Callback <string, FeedbackStatus>( (mid, status) => { Assert.Equal(FeedbackStatus.Reject, status); }); var connectionManager = new Mock <IConnectionManager>(); connectionManager.Setup(c => c.GetCloudConnection(It.IsAny <string>())) .Returns(Task.FromResult(Option.Some(cloudProxy.Object))); var deviceListner = new DeviceMessageHandler(MockIdentity, EdgeHub.Object, connectionManager.Object, DefaultMessageAckTimeout); var messagingServiceClient = new MessagingServiceClient(deviceListner, messageConverter, ByteBufferConverter); Channel.Setup(r => r.Handle(It.IsAny <IProtocolGatewayMessage>())) .Callback <IProtocolGatewayMessage>( m => { msg = m; messagingServiceClient.RejectAsync(msg.Id); }); messagingServiceClient.BindMessagingChannel(Channel.Object); IMessage message = new EdgeMessage.Builder(new byte[] { 1, 2, 3 }).Build(); await dp.SendC2DMessageAsync(message); Assert.NotNull(msg); }