public async Task ShouldSendMessage()
{
var endpointInstance = new TestableEndpointInstance();
var handler = new MyController(endpointInstance);
await handler.HandleRequest()
.ConfigureAwait(false);
var sentMessages = endpointInstance.SentMessages;
Assert.AreEqual(1, sentMessages.Length);
Assert.IsInstanceOf <MyMessage>(sentMessages[0].Message);
}