模拟Ajax.IsRequest返回False

Question

我试图模拟ASP.Net MVC的Ajax.IsRequest()方法.我发现了如何做以使它返回true:

Expect.Call(_myController.Request.Headers["X-Requested-With"]).Return("XMLHttpRequest").Repeat.Any();

这工作并返回true.现在我需要测试代码的另一个分支.我如何模仿它返回虚假？我试图完全删除模拟,它失败了:

System.NullReferenceException:对象引用未设置为对象的实例.]

如果我做:

Expect.Call(_templateReportController.Request["X-Requested-With"]).Return(null).Repeat.Any();

它失败并出现同样的错误.

整个测试:

  /// <summary>
    /// Tests the Edit Action when calling via Ajax
    /// </summary>
    [Test]
    public void Test_Edit_AjaxRequest()
    {
        Group group = new Group();
        group.ID = 1;
        group.Name = "Admin";
        IList<Group> groupList = new List<Group>() { group };

        Definition def  = new Definition();
        def.ID = 1;
        def.Name = "Report";
        def.LastModified = DateTime.UtcNow;
        def.Groups.Add(group);


        using (_mocks.Record())
        {
            Expect.Call(_myController.Request["X-Requested-With"]).Return("XMLHttpRequest").Repeat.Any();
            Expect.Call(_DefBiz.GetAll<Group>()).Return(groupList);
            Expect.Call(_DefBiz.Get<Definition>(1)).Return(def);
        }

        myController.DefAccess = _DefBiz;
        PartialViewResult actual;

        using (_mocks.Playback())
        {
            actual = (PartialViewResult)myController.Edit(1);
        }


    }

有什么建议吗？干杯

Answer 1

你得到的原因NullReferenceException是因为你从未controller.Request在单元测试中存根该对象,并且当你调用使用Request.IsAjaxRequest()它的控制器动作时抛出.

以下是使用Rhino.Mocks以下方法模拟上下文的方法:

[TestMethod]
public void Test_Ajax()
{
    // arrange
    var sut = new HomeController();
    var context = MockRepository.GenerateStub<HttpContextBase>();
    var request = MockRepository.GenerateStub<HttpRequestBase>();
    context.Stub(x => x.Request).Return(request);
    // indicate AJAX request
    request.Stub(x => x["X-Requested-With"]).Return("XMLHttpRequest");
    sut.ControllerContext = new ControllerContext(context, new RouteData(), sut);

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

    // assert
    // TODO: ...
}

[TestMethod]
public void Test_Non_Ajax()
{
    // arrange
    var sut = new HomeController();
    var context = MockRepository.GenerateStub<HttpContextBase>();
    var request = MockRepository.GenerateStub<HttpRequestBase>();
    context.Stub(x => x.Request).Return(request);
    sut.ControllerContext = new ControllerContext(context, new RouteData(), sut);

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

    // assert
    // TODO: ...
}

这里有一个更好的选择(我个人推荐你),以避免所有的管道代码.使用 MVCContrib.TestHelper(基于Rhino.Mocks),您的单元测试可能会简化为:

[TestClass]
public class HomeControllerTests : TestControllerBuilder
{
    private HomeController _sut;

    [TestInitialize()]
    public void MyTestInitialize() 
    {
        _sut = new HomeController();
        this.InitializeController(_sut);
    }

    [TestMethod]
    public void HomeController_Index_Ajax()
    {
        // arrange
        _sut.Request.Stub(x => x["X-Requested-With"]).Return("XMLHttpRequest");

        // act
        var actual = _sut.Index();

        // assert
        // TODO: ...
    }

    [TestMethod]
    public void HomeController_Index_Non_Ajax()
    {
        // act
        var actual = _sut.Index();

        // assert
        // TODO: ...
    }
}

更漂亮.它还允许您在动作结果上写出更具表现力的断言.查看文档或询问是否需要更多信息.