MVC嘲笑HttpContext，模型綁定錯誤

Question

我試圖按照typical pattern重寫ControllerContext以模擬HttpContext。在我的情況下，我特別想測試HTTP POSTS，所以我需要模擬Request.Form。

我嘗試了所有在谷歌上找到的3種口味 - 與Moq，Rhino.Mocks和MVCContrib.TestHelpers。對於我的具體情況，我一直無法找到解決方案。

當我的控制器嘗試模型綁定，我得到以下錯誤：

Object reference not set to an instance of an object. 
System.NullReferenceException: Object reference not set to an instance of an object. 
at Microsoft.Web.Infrastructure.DynamicValidationHelper.ValidationUtility.CollectionReplacer.GetUnvalidatedCollections(HttpContext context) 
at System.Web.Helpers.Validation.Unvalidated(HttpRequest request) 
at System.Web.Mvc.FormValueProviderFactory.<.ctor>b__0(ControllerContext cc) 
at System.Web.Mvc.FormValueProviderFactory.GetValueProvider(ControllerContext controllerContext) 
at System.Web.Mvc.ValueProviderFactoryCollection.<>c__DisplayClassc.<GetValueProvider>b__7(ValueProviderFactory factory) 
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() 
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext() 
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) 
at System.Linq.Enumerable.ToList(IEnumerable`1 source) 
at System.Web.Mvc.ValueProviderFactoryCollection.GetValueProvider(ControllerContext controllerContext) 
at System.Web.Mvc.Controller.TryUpdateModel(TModel model) 
at eServices.Admin.Web.Controllers.User.UserController.Search() in UserController.cs: line 56 
at eServices.Admin.Specs.Controllers.when_the_user_controller_is_posted_the_manage_users_find_form.<.ctor>b__1() in UserControllerSpecs.cs: line 96 

這似乎表明，它是沒有找到嘲笑的形式。下面是測試代碼片段：

MoqHttpContext MoqHttpContext = new MoqHttpContext(); 
var sut = new UserController(
      UserRepository, 
      EmailService, 
      SessionProvider); 

var controllerContext = new ControllerContext 
     (new RequestContext(MoqHttpContext.GetHttpContext(), new RouteData()), sut); 
sut.ControllerContext = controllerContext; 

MoqHttpContext.FormData.Add("FindCriteria.SearchText", "searchText"); 
MoqHttpContext.FormData.Add("FindCriteria.AccountIsPending", "true"); 

sut.Search(); 

...

控制器：

[AcceptVerbs(HttpVerbs.Post)] 
    public ActionResult Search() 
    { 
     var manageUsersViewModel = new ManageUsersViewModel(); 
     TryUpdateModel(manageUsersViewModel); 

...

測試員額的任何意見或更好的解決方案？

Answer 1

使用MvcContrib.TestHelper：是

// arrange 
var sut = new SomeController(); 
var tcb = new TestControllerBuilder(); 
tcb.InitializeController(sut); 
var formValues = new FormCollection() 
{ 
    { "FindCriteria.SearchText", "searchText" }, 
    { "FindCriteria.AccountIsPending", "true" }, 
}; 
sut.ValueProvider = formValues.ToValueProvider(); 

// act 
var actual = sut.Search(); 

// assert 
... 

Any ideas or better solutions for testing POSTs?

：使用TryUpdateModel而不是有你的控制器動作直接將視圖模型參數：

[HttpPost] 
public ActionResult Search(ManageUsersViewModel model) 
{ 
    ... 
} 

然後在單元測試：

// arrange 
var sut = new SomeController(); 
var model = new ManageUsersViewModel 
{ 
    FindCriteria = new FindCriteria 
    { 
     SearchText = "searchText", 
     AccountIsPending = true 
    } 
}; 

// act 
var actual = sut.Search(model); 

// assert 
...