Moq, Unity and Servicelocator

Feb, 2013

Unit testing code that utilizes Unity, ServiceLocator with Moq framework is a thing of a beauty. Well,not really but a pain if it's your first time. Why? Because if you are a heavy google first, code second type of a developer then googling for Moq + ServiceLocator implementation would only give you Moq + Unity but no ServiceLocator implementation or examples. So, after spending nearly an hr, decided to share or at least remind myself how to for the next time:

Bootstrapping your ServiceLocator:
Note: This is the initialization of Unity in your code


        public static class Bootstrapper
    {
        public static void Initialise()
        {
            var container = BuildUnityContainer();

            var provider = new UnityServiceLocator(container);
            ServiceLocator.SetLocatorProvider(() => provider);

            GlobalConfiguration.Configuration.DependencyResolver = new Unity.WebApi.UnityDependencyResolver(container);
        }

        private static IUnityContainer BuildUnityContainer()
        {
            var container = new UnityContainer();

            container.RegisterType();

            return container;
        }
    }

Then in your calling method you would do something like this:


         IAssetManager _assetManager = ServiceLocator.Current.GetInstance();

Following is how to moq the above Unity and ServiceLocator instance in Unit test cases:


    
using Moq;
using Microsoft.Practices.ServiceLocation;

var mockManager = new Mock();
var mockServiceLocator = new Mock();            

mockManager.Setup(assetManager => assetManager.AddToQueue(It.IsAny())).Returns(
 new Models.ResponseMessage()
 {
  Status = "Success"
 });

mockServiceLocator.Setup(x => x.GetInstance()).Returns(mockManager.Object);
ServiceLocator.SetLocatorProvider(new ServiceLocatorProvider(() => mockServiceLocator.Object));

// do your tests..