在单元测试动作时，为什么Controller.Url为null? [英] Why is Controller.Url null when I unit test my action?

问题描述

我已遵循此答案来模拟HttpContext，请求，响应和用户，并设置了Controller.ControllerContext和.

I've followed this answer to mock HttpContext, Request, Response and User and set Controller.ControllerContext and Controller.Url.

Controller.Url绝对不为null.但是，在controller.Index()中，它为null.看起来很奇怪.我想念什么?

Controller.Url is most definitely not null before calling controller.Index(). However, inside controller.Index(), it is null. It seems very strange. What am I missing?

这是我的测试装置:

[TestFixture]
public class ControllerFixtureBase
{
    private Mock<HttpContextBase> _httpContextMock;
    private RouteCollection _routes;

    [SetUp]
    public void SetUp()
    {
        var requestMock = new Mock<HttpRequestBase>();
        requestMock.SetupGet(x => x.ApplicationPath)
            .Returns("/");
        requestMock.SetupGet(x => x.Url)
            .Returns(new Uri("http://localhost/a", UriKind.Absolute));
        requestMock.SetupGet(x => x.ServerVariables)
            .Returns(new NameValueCollection());

        var responseMock = new Mock<HttpResponseBase>();
        responseMock.Setup(x => x.ApplyAppPathModifier(It.IsAny<string>()))
            .Returns((string url) => url);

        var principalMock = new Mock<IPrincipal>();
        principalMock.SetupGet(p => p.Identity)
            .Returns(new GenericIdentity("testuser"));
        principalMock.Setup(p => p.IsInRole(ApplicationRoles.DataAdmin))
            .Returns(false);

        _httpContextMock = new Mock<HttpContextBase>();
        _httpContextMock.Setup(x => x.User)
            .Returns(principalMock.Object);
        _httpContextMock.Setup(x => x.Request)
            .Returns(requestMock.Object);
        _httpContextMock.SetupGet(x => x.Response)
            .Returns(responseMock.Object);

        _routes = new RouteCollection();
        MvcApplication.RegisterRoutes(_routes);
    }

    protected void PrepareController(Controller controller)
    {
        var requestContext = new RequestContext(_httpContextMock.Object, new RouteData());

        controller.ControllerContext = new ControllerContext(requestContext, controller);
        controller.Url = new UrlHelper(requestContext, _routes);
    }

    [Test]
    public void Index()
    {
        HomeController controller = new HomeController();
        PrepareController(controller);

        Assert.That(controller.Url, Is.Not.Null);
        Assert.That(controller.ViewBag, Is.Not.Null);

        ViewResult viewResult = controller.Index() as ViewResult;

        Assert.That(viewResult, Is.Not.Null);
        Assert.That(viewResult.ViewBag.IndexUrl, Is.EqualTo("/"));
    }
}

这是我非常简单的动作:

And here's my very simple action:

[Authorize]
public class HomeController : Controller
{
    public ActionResult Index()
    {
        ViewBag.Message = "Modify this template to jump-start your ASP.NET MVC application.";

        // System.NullReferenceException : Object reference not set to an instance of an object.
        ViewBag.IndexUrl = Url.Action("Index");

        return View();
    }
 }

推荐答案

似乎答案与嘲笑无关.我的MVC和测试项目都是使用MVC 4 Beta创建的.我在AuthorizeAttribute上遇到了一些奇怪的问题，因此我通过创建新项目并移动文件来将项目转换为MVC 3.

It seems the answer has nothing to do with mocking. Both my MVC and test project were creating using MVC 4 beta. I ran into some weird issues with AuthorizeAttribute so I converted the projects to MVC 3 by creating new projects and moving files around.

我一定有一些不匹配的引用，因为当我从两个项目中手动删除所有MVC和Web引用并重新添加它们时，测试就通过了.

I must have had some mismatched references, because when I manually removed all MVC and Web references from both projects and re-added them, the test passed.

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