public async Task NewMessageIsProcessed()
{
// Arrange
var mockManagedMqttClient = new Mock <IManagedMqttClient>();
var mockManagedMqttClientOptions = new Mock <IManagedMqttClientOptions>();
var mockMqttClientFactory = new Mock <IManagedMqttClientFactory>();
var messageProcessor = new Mock <IProcesMqttMessage>();
mockMqttClientFactory
.Setup(m => m.CreateManagedMqttClient())
.Returns(mockManagedMqttClient.Object);
messageProcessor.Setup(x => x.OnMessage(It.IsAny <MqttMessageReceivedEventArgs>())).Returns(Task.CompletedTask);
var config = new MqttConfiguration("CustomConfig", mockManagedMqttClientOptions.Object);
var mqttConnection = new MqttConnection(mockMqttClientFactory.Object, config, _mockLogger.Object);
// Act
await mqttConnection.StartAsync(messageProcessor.Object);
await mqttConnection.HandleApplicationMessageReceivedAsync(new MqttApplicationMessageReceivedEventArgs("ClientId", DefaultMessage));
// Assert
messageProcessor.Verify(x => x.OnMessage(It.Is <MqttMessageReceivedEventArgs>(y => y.Message.Topic == DefaultMessage.Topic)));
messageProcessor.Verify(x => x.OnMessage(It.Is <MqttMessageReceivedEventArgs>(y => y.Message.Retain == DefaultMessage.Retain)));
messageProcessor.Verify(x => x.OnMessage(It.Is <MqttMessageReceivedEventArgs>(y => y.Message.QosLevel.ToString() == DefaultMessage.QualityOfServiceLevel.ToString())));
messageProcessor.Verify(x => x.OnMessage(It.Is <MqttMessageReceivedEventArgs>(y => y.Message.GetMessage() == DefaultMessage.Payload)));
}