Question

I’m having a difficult time registering my types for Unity 2 in my unit tests.

Here’s a snippet of the class under test:

public class SomeService : ISomeService
{
    private int SomeVar { get; set; }

    [Dependency]
    public ISessionManager SessionManager { get; set; }

    public SomeService()
    {
        SomeVar = SessionManager.Get<int>("SomeVar");
    }
}

Here’s what I have in my MSTest ClassInitialize method:

private static ISomeService _someService;
private static IUnityContainer _unityContainer;
[ClassInitialize]
public static void MyClassInitialize(TestContext testContext)
{
    var mockSessionManager = new Mock<ISessionManager>();

    mockSessionManager.Setup(foo => foo.Get<int>(It.IsAny<string>())).Returns(1);

    _unityContainer = new UnityContainer()
        .RegisterInstance(mockSessionManager.Object)
        .RegisterType<ISomeService, SomeService>(
            new InjectionProperty("SessionManager"));

    _someService = _unityContainer.Resolve<IAdditionalCoveragesService>();
}

For every test method that I have, when I debug and step into the constructor of SomeService, it says that SessionManager is null. What am I doing in wrong in trying to register my types in Unity?

Note – I am using Moq to set up a mock session manager that should be injected into SomeService.

Thanks!!!

Answer 1

Because it’s an injection property: the property is set after being created. To use SessionManager in the constructor you should use constructor injection:

public class SomeService : ISomeService
{
    private int SomeVar { get; set; }

    public ISessionManager SessionManager { get; private set; }

    public SomeService(ISessionManager sessionManager)
    {
        SessionManager = sessionManager;
        SomeVar = SessionManager.Get<int>("SomeVar");
    }
}

and:

_unityContainer = new UnityContainer()
        .RegisterInstance(mockSessionManager.Object)
        .RegisterType<ISomeService, SomeService>();