How do you Mock an class for a unit test that has a return type but no input parameters

问题

I have a method in code that returns an OrganisationModel.

public virtual OrganisationModel GetCurrentUserOrganisation()
{
    var user = DBEntities.AspNetUsers.Find(_userId);
    if (user.ActiveOrganisation != null)
    {

       var org = user.OrganisationUsers.Where(p => p.organisationId == 
    user.ActiveOrganisation).Where(p => p.userId == _userId).FirstOrDefault();
        if(org != null)
        {
            if (org.Organisation != null)
            {
                return org.Organisation.ToModel();
            }
            return null;
        }
        else
        {
            return null;
        }
    }
    return null;    
}

I want to write a unit test on a class that uses this method my test looks like this

public void Index()
{
    HttpContext.Current = _TestContext;
    var _GovernorLogic = new Mock<GovernorLogic>();

    var testdata = new OrganisationModel { OrganisationId = 3, OrganisationName = "Test Org" };


    var _OrganisationLogic = new Mock<OrganisationLogic>(new UserId { userId = "e58bf834-2c06-4cc0-ac00-231a5e1a9bbc" }) ;
    _OrganisationLogic.Setup((OrganisationLogic p) => p.GetCurrentUserOrganisation()).Returns((OrganisationModel model) => testdata).Callback((OrganisationLogic a) => receivedorganisation = a.GetCurrentUserOrganisation());

    GovernorsController controller = new GovernorsController(_OrganisationLogic.Object);

    ViewResult result = controller.Index() as ViewResult;

    Assert.IsNotNull(result);
}

When I run this I get an error telling me that

System.ArgumentException Invalid callback. Setup on method with 0 parameter(s) cannot invoke callback with different number of parameters (1). Source=Moq StackTrace: at Moq.MethodCallReturn2.ValidateNumberOfCallbackParameters(MethodInfo callbackMethod) at Moq.MethodCallReturn2.ValidateReturnDelegate(Delegate callback) at Moq.MethodCallReturn2.Returns[T](Func2 valueExpression)

How do I test a method that accepts no input parameters but has a return type?

The Controller Action Method I am trying to test is shown below along with the Constructor for the Controller.

[Inject]
public GovernorsController(GovernorLogic GovernorLogic, OrganisationLogic logic) : base(logic)
{
     _GovernorLogic = GovernorLogic;
}



public ActionResult Index()
{
    var CurrentGovernors = _GovernorLogic.GetAllCurrentGovernors(Organisation.GetCurrentUserOrganisation().OrganisationId).ToList().Select(p => p.ToViewModel()).ToList();
    var ArchivedGovernors = _GovernorLogic.GetAllArchivedGovernors(Organisation.GetCurrentUserOrganisation().OrganisationId).ToList().Select(p => p.ToViewModel()).ToList();

    var Model = new GovernorsViewModel
    {
        CurrentGovernors = CurrentGovernors,
        ArchivedGovernors = ArchivedGovernors,
    };

    return View(Model);
}

The base controller that is inherited by GovernorsController is shown below:

    public class BaseController : Controller
    {
        private OrganisationLogic _organisationLogic;
        private ApplicationSignInManager _signInManager;
        private ApplicationUserManager _userManager;

        private string _userId;

        [Inject]
        public BaseController(OrganisationLogic OrganisationLogic)
        {
            _userId = System.Web.HttpContext.Current.User.Identity.GetUserId();
            _organisationLogic = new OrganisationLogic(new UserId {userId= System.Web.HttpContext.Current.User.Identity.GetUserId()});
        }

        protected OrganisationLogic Organisation
        {
            get
            {
                return _organisationLogic;
            }
        }

        public BaseController(ApplicationUserManager userManager, ApplicationSignInManager signInManager)
        {
            UserManager = userManager;
            SignInManager = signInManager;


        }

        public ApplicationSignInManager SignInManager
        {
            get
            {
                return _signInManager ?? HttpContext.GetOwinContext().Get<ApplicationSignInManager>();
            }
            set
            {
                _signInManager = value;
            }
        }


        public ApplicationUserManager UserManager
        {
            get
            {
                return _userManager ?? HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>();
            }
           set
            {
                _userManager = value;
            }
        }
    }

------ Minimal Complete Example -------

Base Controller

public class BaseController : Controller
{
    private OrganisationLogic _organisationLogic;
    private string _userId;

    [Inject]
    public BaseController(OrganisationLogic OrganisationLogic)
    {
        _userId = System.Web.HttpContext.Current.User.Identity.GetUserId();
        _organisationLogic = new OrganisationLogic(new UserId {userId= System.Web.HttpContext.Current.User.Identity.GetUserId()});
    }

 [ChildActionOnly]
    public ActionResult UserOrganisations()
    {
        if (User.Identity.IsAuthenticated)
        {
            var ViewModel = _OrganisationLogic.GetAll().ToList().Select(p=>p.ToViewModel());
            return PartialView("_UserOrganisations", ViewModel);
        }
        return null;
    }

}

///The child action in the base controller is use in the layout page to render organisation in a drop down list. It is this that is making use of _OrganisationLogic /////
@Html.Action("UserOrganisations", "Base",new {area = "" })

GovernorsController

public class GovernorsController : OrganisationBaseController
{

    [Inject]
    public GovernorsController(OrganisationLogic logic) : base(logic)
    {

    }


    // GET: Organisation/Governors
    public ActionResult Index()
    {

        var Model = new SomeModel();

        return View(Model);
    }

}

OrganisationLogic

public class OrganisationLogic : LogicRepository<OrganisationModel>
{
    private string _userId;
    public OrganisationLogic(UserId userId)
    {
        _userId = userId.userId;
    }

    public override List<OrganisationModel> GetAll()
    {
        var orgs = DBEntities.Organisations.Where(p=>p.IsDeleted!=true).ToList().Select(p=>p.ToModel()).ToList();
        return orgs;
    }

}

来源：https://stackoverflow.com/questions/49211389/how-do-you-mock-an-class-for-a-unit-test-that-has-a-return-type-but-no-input-par