關於用戶身份的空引用

Question

我是編寫單元測試用例的新手。我在User.Identity上遇到錯誤。我看到嘲笑是解決這個問題的方法，我嘗試了一些不適合我的案例。我已經加入我的代碼

我的控制器

public ActionResult CreateStage (EnthiranStageViewModel enthiranStage) 
{ 
    if (ModelState.IsValid) 
    { 
     Stage stage = enthiran.Insert_Stage(enthiranStage); 
     //logging Stage Creation 
     util.ApplicationLog(new ViewModel.Logs.ApplicationLogViewModel 
     { 
     GameCategorys = GameCategory.Enthiran, 
     Event = Events.EnthiranStageCreation, 
     SessionAttemptId = null, 
     UserId = User.Identity.GetUserId<int>(), 
     OptionalParameter1 = enthiranStage.GameId, 
     OptionalParameter2 = stage.Id, 
     Description = "Enthiran stage created" 
     }); 
     return RedirectToAction("Stages", new 
     { 
      id = stage.GameId 
     }); 
    } 
    return View(); 
} 

以下是我測試的情況下

[TestMethod()] 
public void createStage () 
{ 
    EnthiranStageViewModel enthiranStage = new EnthiranStageViewModel 
    { 
     StageType=0, 
     TriggerBeginType = Akton.Areas.Challenge.Models.TriggerType.Manual, 
     TriggerEndType= Akton.Areas.Challenge.Models.TriggerType.Manual, 
     TimeLimit = new TimeSpan(9, 6, 13), 
     TriggerBeginTime= new DateTime(2016, 09, 3, 9, 6, 13), 
     TriggerEndTime= new DateTime(2016, 09, 3, 9, 6, 13), 
     StartValueType= Akton.Areas.Challenge.Models.StartValueType.Global, 
     StageDate= new DateTime(2016, 09, 3, 9, 6, 13), 
     Proforma=25, 
     GameId=19, 
     CreatedTime=new DateTime(2016, 09, 3, 9, 6, 13), 
     UpdatedTime= new DateTime(2016, 09, 3, 9, 6, 13), 
     StageName="Test", 

    }; 
    EnthiranController controller = new EnthiranController(); 
    JsonResult actual = controller.CreateStage(enthiranStage) as JsonResult; 
    var result = actual.Data; 
    Assert.AreEqual("{ success = True }", result.ToString()); 
} 

在這裏，我必須通過userId在ViewModel.Logs.ApplicationLogViewModel，我不知道該怎麼做。

我該如何得到applicationLogViewModel的userId？

Answer 1

一種解決方案是改變EnthiranController，並通過，例如，IUserContext，這樣的事情：

public interface IUserContext 
{ 
    public IPrincipal User {get;} 
} 

然後傳遞通過構造到所述控制器，並使用該上下文來檢索用戶。

ctor EnthiranController(IUserContext userContext) 

然後稍微改變單元測試來模擬所有這些接口。而不是JsonResult，您可以使用ActionResult或RedirectToRouteResult，如下例所示。

[TestMethod()] 
public void createStage () 
{ 
    //arrange 
    EnthiranStageViewModel enthiranStage = new EnthiranStageViewModel 
    { 
     StageType=0, 
     TriggerBeginType = Akton.Areas.Challenge.Models.TriggerType.Manual, 
     TriggerEndType= Akton.Areas.Challenge.Models.TriggerType.Manual, 
     TimeLimit = new TimeSpan(9, 6, 13), 
     TriggerBeginTime= new DateTime(2016, 09, 3, 9, 6, 13), 
     TriggerEndTime= new DateTime(2016, 09, 3, 9, 6, 13), 
     StartValueType= Akton.Areas.Challenge.Models.StartValueType.Global, 
     StageDate= new DateTime(2016, 09, 3, 9, 6, 13), 
     Proforma=25, 
     GameId=19, 
     CreatedTime=new DateTime(2016, 09, 3, 9, 6, 13), 
     UpdatedTime= new DateTime(2016, 09, 3, 9, 6, 13), 
     StageName="Test"  
    }; 

    Mock<IPrincipal> mockPrincipal = new Mock<IPrincipal>(); 
    //TODO: setup mockPrincipal 
    Mock<IUserContext> mockUserContext = new Mock<IUserContext>(); 
    mockUserContext.Setup(p => p.User).Returns(mockPrincipal.Object); 

    EnthiranController controller = new EnthiranController(mockUserContext.Object); 

    //act 
    var actual = controller.CreateStage(enthiranStage) as RedirectToRouteResult; 

    //assert 
    Assert.IsNotNull(actual); 
}