基本MVC3單元測試失敗UpdateModel（）

Question

自從我做任何MVC工作已經有一段時間了，所以我希望錯過一些東西。我試圖編寫測試和控制器操作來簡單地編輯名爲「Business」的DTO。

控制器動作：

[HttpPost] 
public ActionResult Edit(string id, Business business) 
{ 
    try 
    { 
     var model = _businessRepository.Get(id); 

     if (model != null) 
     { 
      UpdateModel(model); 

      if (ModelState.IsValid) 
      { 
       _businessRepository.Save(model); 
      } 
      else 
      { 
       return View(business); 
      } 
     } 

     return RedirectToAction("Index"); 
    } 
    catch 
    { 
     return View(); 
    } 
} 

測試：

[TestMethod] 
public void Edit_Post_Action_Updates_Model_And_Redirects() 
{ 
    // Arrange 
    var mockBusinessRepository = new Mock<IBusinessRepository>(); 
    var model = new Business { Id = "1", Name = "Test" }; 
    var expected = new Business { Id = "1", Name = "Not Test" }; 

    // Set up result for business repository 
    mockBusinessRepository.Setup(m => m.Get(model.Id)).Returns(model); 
    mockBusinessRepository.Setup(m => m.Save(expected)).Returns(expected); 
    var businessController = new BusinessController(mockBusinessRepository.Object); 

    // Act 
    var result = businessController.Edit(model.Id, expected) as RedirectToRouteResult; 

    // Assert 
    Assert.IsNotNull(result); 
    Assert.AreEqual(result.RouteValues["action"], "Index"); 
    mockBusinessRepository.VerifyAll(); 
} 

，它是給對異常的線，是在控制器中的UpdateModel（）。異常細節：

「值不能爲空參數名：controllerContext」

Answer 1

我已經成功地得到我想要通過使用Automapper代替的UpdateModel工作。

我在automapper初始化加（IPersistable是我所有的DTO接口）：

Mapper.CreateMap<IPersistable, IPersistable>().ForMember(dto => dto.Id, opt => opt.Ignore()); 

然後我改變了我的控制器行動：

[HttpPost] 
public ActionResult Edit(string id, Business business) 
{ 
    try 
    { 
     var model = _businessRepository.Get(id); 

     if (model != null) 
     { 
      Mapper.Map(business, model); 

      if (ModelState.IsValid) 
      { 
       _businessRepository.Save(model); 
      } 
      else 
      { 
       return View(business); 
      } 
     } 

     return RedirectToAction("Index"); 
    } 
    catch 
    { 
     return View(); 
    } 
} 

而且改變了我的測試：

[TestMethod] 
public void Edit_Post_Action_Updates_Model_And_Redirects() 
{ 
    // Arrange 
    var mockBusinessRepository = new Mock<IBusinessRepository>(); 
    var fromDB = new Business { Id = "1", Name = "Test" }; 
    var expected = new Business { Id = "1", Name = "Not Test" }; 

    // Set up result for business repository 
    mockBusinessRepository.Setup(m => m.Get(fromDB.Id)).Returns(fromDB); 
    mockBusinessRepository.Setup(m => m.Save(It.IsAny<Business>())).Returns(expected); 
    var businessController = new BusinessController(mockBusinessRepository.Object) {ControllerContext = new ControllerContext()}; 

    //Act 
    var result = businessController.Edit(fromDB.Id, expected) as RedirectToRouteResult; 

    // Assert 
    Assert.IsNotNull(result); 
    Assert.AreEqual(result.RouteValues["action"], "Index"); 
    mockBusinessRepository.VerifyAll(); 
} 

Answer 2

您需要模擬ControllerContext您BusinessController。

請參閱this question或this one。

Answer 3

我在Gist上有一些代碼，我通常用它來設置ControllerContext。該代碼是最初從Hanselman的博客中獲得的修改版本。

https://gist.github.com/1578697 (MvcMockHelpers.cs)

Answer 4

安裝的控制器上下文

以下是我工作的一個項目的代碼片段，所以也許這是給你累

public class TestBase 
    { 
     internal Mock<HttpContextBase> Context; 
     internal Mock<HttpRequestBase> Request; 
     internal Mock<HttpResponseBase> Response; 
     internal Mock<HttpSessionStateBase> Session; 
     internal Mock<HttpServerUtilityBase> Server; 
     internal GenericPrincipal User; 

      public void SetContext(Controller controller) 
      { 
       Context = new Mock<HttpContextBase>(); 
       Request = new Mock<HttpRequestBase>(); 
       Response = new Mock<HttpResponseBase>(); 
       Session = new Mock<HttpSessionStateBase>(); 
       Server = new Mock<HttpServerUtilityBase>(); 
     User = new GenericPrincipal(new GenericIdentity("test"), new string[0]); 

       Context.Setup(ctx => ctx.Request).Returns(Request.Object); 
       Context.Setup(ctx => ctx.Response).Returns(Response.Object); 
       Context.Setup(ctx => ctx.Session).Returns(Session.Object); 
       Context.Setup(ctx => ctx.Server).Returns(Server.Object); 
       Context.Setup(ctx => ctx.User).Returns(User); 

       Request.Setup(r => r.Cookies).Returns(new HttpCookieCollection()); 
       Request.Setup(r => r.Form).Returns(new NameValueCollection()); 
     Request.Setup(q => q.QueryString).Returns(new NameValueCollection()); 
       Response.Setup(r => r.Cookies).Returns(new HttpCookieCollection()); 

       var rctx = new RequestContext(Context.Object, new RouteData()); 
controller.ControllerContext = new ControllerContext(rctx, controller); 
      } 
} 

然後在您的測試，你可以編排：

//Arrange 
SetContext(_controller); 
Context.Setup(ctx => ctx.Request).Returns(Request.Object); 

如果你想測試用的ModelState錯誤的方法，添加：

_controller.ModelState.AddModelError("Name", "ErrorMessage"); 

Answer 5

我有同樣的問題，並使用堆棧跟蹤將其固定到ValueProvider。對安德魯的回答上面嘲諷一些由控制器使用的底層對象的建設，我設法還嘲諷ValueProvider這樣解決了空值異常：

var controller = new MyController(); 

// ... Other code to mock objects used by controller ... 

var mockValueProvider = new Mock<IValueProvider>(); 
controller.ValueProvider = mockValueProvider.Object; 

// ... rest of unit test code which relies on UpdateModel(...)