public async Task ForwardsGetTwinOperationToEdgeHub()
{
var edgeHub = new Mock <IEdgeHub>();
var connMgr = Mock.Of <IConnectionManager>();
var identity = Mock.Of <IDeviceIdentity>(i => i.Id == "d1");
var cloudProxy = Mock.Of <ICloudProxy>();
var deviceProxy = new Mock <IDeviceProxy>();
IMessage actualMessage = null;
deviceProxy.Setup(d => d.SendTwinUpdate(It.IsAny <IMessage>()))
.Callback <IMessage>(m => actualMessage = m)
.Returns(Task.CompletedTask);
IMessage expectedMessage = new EdgeMessage.Builder(new byte[0]).Build();
edgeHub.Setup(e => e.GetTwinAsync(It.IsAny <string>())).Returns(Task.FromResult(expectedMessage));
Mock.Get(connMgr).Setup(c => c.GetCloudConnection(It.IsAny <string>())).Returns(Task.FromResult(Option.Some(cloudProxy)));
var listener = new DeviceMessageHandler(identity, edgeHub.Object, connMgr, DefaultMessageAckTimeout, Option.None <string>());
listener.BindDeviceProxy(deviceProxy.Object);
await listener.SendGetTwinRequest("cid");
edgeHub.Verify(x => x.GetTwinAsync(identity.Id), Times.Once);
Assert.Same(expectedMessage, actualMessage);
}