如何使用Microsoft伪造品模拟User.Identity.Name

Question

使用Visual Studio 2012对MVC 4应用程序进行单元测试时，如何使用Microsoft Fakes来模拟User.Identity.Name。我正在为项目创建操作方法编写单元测试。

[HttpPost]

    public ActionResult Create([Bind(Include = "Name")]Category category)
    {

        if (categoryService.IsNameExists(category.Name))
        {
            ModelState.AddModelError("Name", "Category name already exists!");
            return View(category);
        }
        try
        {
            if (ModelState.IsValid)
            {
                UserProfile p = new UserProfile();  
                p.UserName = User.Identity.Name;

                category.CreatedBy = p;
                category.CreatedDate = DateTime.Now;
                category.Active = true;
                category.DeletedBy =  null;

                category = categoryService.SaveCategory(category);
                return RedirectToAction("Index");
            }
            return View(category);
        }
        catch (DataException dex)
        {

        }
    }


[TestMethod]
    public void Create()
    {
        Category createdCategory = new Category();
        ICategoryService service = new StubICategoryService()
        {
            SaveCategoryCategory = (category) => { return category; }
        };
        CategoryController controller = new CategoryController(service);

        using (ShimsContext.Create())
        {
            System.Fakes.ShimDateTime.NowGet = () =>
            { return new DateTime(2000, 1, 1); };

            ViewResult result = controller.Create(createdCategory) as ViewResult;

            Assert.IsNotNull(result);
        }
    }

这些是我编写的动作方法和测试方法。 如果除了MS Fakes之外还有其他更好的方法，请告诉我（而不是其他模拟框架）。

Answer 1

假设您已经为System.Web和System添加了Fakes引用，则可以在using (ShimsContext.Create())块内执行以下操作：

var context = new System.Web.Fakes.ShimHttpContext();
var user = new StubIPrincipal
{
    IdentityGet = () =>
    {
        var identity = new StubIIdentity {NameGet = () => "foo"};
        return identity;
    }
};

context.UserGet = () => principal;
System.Web.Fakes.ShimHttpContext.CurrentGet = () => { return context; };

Answer 2

User实际上是HttpContext.User 。 因此，您可以使用System.Fakes.ShimHttpContext返回包含正确的Identity.Name的整个IPrincipal的自定义实现。

Answer 3

我最终得到了与@Sven类似的答案，但最终却对上下文进行了存根，而不是使用填充程序。

using (AccountController controller = new AccountController())
{
    StubHttpContextBase stubHttpContext = new StubHttpContextBase();

    controller.ControllerContext = new ControllerContext(stubHttpContext, new RouteData(), controller);

    StubIPrincipal principal = new StubIPrincipal();
    principal.IdentityGet = () =>
    {
        return new StubIIdentity 
        { 
            NameGet = () => "bob" 
        };
    };
    stubHttpContext.UserGet = () => principal;
}