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我在编写一些单元测试来测试我创建的自定义 ModelBinder 时遇到了一些困难。我尝试进行单元测试的 ModelBinder 是我在此处发布的 JsonDictionaryModelBinder 。

我遇到的问题是使用 Moq 进行模拟所有设置。由于 HttpContextBase 未正确模拟，我不断收到 Null 异常。我认为。

有人可以帮我弄清楚我做错了什么吗？

这是我正在尝试编写但不起作用的单元测试示例：

[TestMethod()]
public void BindModelTest()
{
    JsonDictionaryModelBinder target = new JsonDictionaryModelBinder();

    NameValueCollection nameValueCollection = new NameValueCollection() {
        {"First", "1"},
        {"Second", "2"},
        {"Name", "Chris"},
        {"jsonValues", "{id: 200, name: 'Chris'}"}
    };

    HttpContextBase httpContext = MockHelper.FakeHttpContext(HttpVerbs.Post, nameValueCollection);

    ControllerContext controllerContext =
        new ControllerContext(new RequestContext(httpContext, new RouteData()), new Mock<Controller>().Object);


    Predicate<string> predicate = propertyName => (propertyName == "jsonValues");
    ModelBindingContext bindingContext = new ModelBindingContext()
    {
        Model = null,
        ModelType = typeof(JsonDictionary),
        ModelState = new ModelStateDictionary(),
        PropertyFilter = predicate,
        ValueProvider = new Dictionary<string, ValueProviderResult>() { { "foo", null } }
    };

    //object expected = null; // TODO: Initialize to an appropriate value
    var actual = target.BindModel(controllerContext, bindingContext) as JsonDictionary;

    Assert.IsNotNull(actual);

    Assert.AreEqual("Chris", actual["name"]);
    //Assert.AreEqual(expected, actual);
    Assert.Inconclusive("Verify the correctness of this test method.");
}

这是上面使用的“FakeHttpContext”方法：

public static class MockHelper
{
    public static HttpContextBase FakeHttpContext(HttpVerbs verbs, NameValueCollection nameValueCollection)
    {
        var httpContext = new Mock<HttpContextBase>();

        var request = new Mock<HttpRequestBase>();
        request.Setup(c => c.Form).Returns(nameValueCollection);
        request.Setup(c => c.QueryString).Returns(nameValueCollection);

        var response = new Mock<HttpResponseBase>();
        var session = new Mock<HttpSessionStateBase>();
        var server = new Mock<HttpServerUtilityBase>();
        httpContext.Setup(c => c.Request).Returns(request.Object);

        var u = verbs.ToString().ToUpper();
        httpContext.Setup(c => c.Request.RequestType).Returns(
            verbs.ToString().ToUpper()
        );

        httpContext.Setup(c => c.Response).Returns(response.Object);
        httpContext.Setup(c => c.Server).Returns(server.Object);
        httpContext.Setup(c => c.User.Identity.Name).Returns("testclient");
        return httpContext.Object;
    }
}
4

1 回答 1

7

罪魁祸首是这一行：

httpContext.Setup(c => c.Request.RequestType).Returns(
                verbs.ToString().ToUpper()
            );

这在技术上是SetupRequest 对象的第二个，它正在清除原始的Setup，即使您要在对象层次结构中“过去”它。我不确定这是最小起订量中的错误还是所需的行为，我之前也遇到过这个问题，但还没有抽出时间来检查它。

您可以通过将该行移动到上面设置请求的位置并直接设置它来解决它，而不是通过 httpContext. 所以，

request.Setup(c => c.RequestType).Returns(verbs.ToString().ToUpper());

我还注意到您声明的“var u”没有被使用；）

于 2009-07-04T02:41:28.140 回答