Unittest SignalR Hubs

nunit, signalr, testing, unit-testing

Solution

This link shows how to unit test SignalR hub methods using Moq. You mock up the respository, clients, context, and the caller. Here's the code from the site, I made some minor changes to make it work with the latest SignalR:

public class TestableChatHub : ChatHub  
{  
 public Mock<IChatRepository> MockChatRepository { get; private set; }

 public TestableChatHub(Mock<IChatRepository> mockChatRepository)  
   : base(mockChatRepository.Object)  
 {
   const string connectionId = "1234";  
   const string hubName = "Chat";  
   var mockConnection = new Mock<IConnection>();  
   var mockUser = new Mock<IPrincipal>();  
   var mockCookies = new Mock<IRequestCookieCollection>();

   var mockRequest = new Mock<IRequest>();  
   mockRequest.Setup(r => r.User).Returns(mockUser.Object);  
   mockRequest.Setup(r => r.Cookies).Returns(mockCookies.Object);

   Clients = new ClientProxy(mockConnection.Object, hubName);  
   Context = new HubCallerContext(mockRequest.Object, connectionId);

   var trackingDictionary = new TrackingDictionary();  
   Caller = new StatefulSignalProxy(
        mockConnection.Object, connectionId, hubName, trackingDictionary);  
 }  
}

Then the site shows that you can use this testable hub to write unit tests:

   [TestClass]  
   public class ChatHubTests  
   {  
     private TestableChatHub _hub;

     public void SetUpTests()  
     {  
       _hub = GetTestableChatHub();  
     }

     [Test]  
     public void ExampleTest()  
     {  
       SetUpTests();
       const string message = "test";  
       const string connectionId = "1234";

       var result = _hub.Send(message);

       _hub.MockChatRepository.Verify(r => r.SaveMessage(message, connectionId));
       Assert.IsTrue(result);  
     }

     private TestableChatHub GetTestableChatHub()  
     {  
       var mockRepository = new Mock<IChatRepository>();  
       mockRepository.Setup(m => m.SaveMessage(
            It.IsAny<string>(), It.IsAny<string())).Returns(true);  
       return new TestableChatHub(mockRepository);  
     }  
   }

Problem

I Would like to test my Hub in SignalR, what is the best approach? Possible solutions I have thought about so far: - Create a testable Hub - Abstract logic to separate class - Selenium (would like to test smaller units) - Or is it some SignalR testing features have overlooked Currently using SignalR 0.4, and NUnit as the testing framework.

Original source