如何使用Moq模拟Response.StatusCode？

Question

我有以下方法:

    public void SetHttpStatusCode(HttpStatusCode httpStatusCode)
    {
        Response.StatusCode = (int)httpStatusCode;
    }

以下是测试内容：

    [TestMethod]
    public void SetHttpStatusCode_SetsCorrectStatusCode()
    {
        //Arrange
        //Any url will suffice
        var mockHttpContext = TestHelpers.MakeHttpContext(""); 
        mockHttpContext.SetupSet(x => x.Response.StatusCode = It.IsAny<int>());

        //creates an instance of an asp.net mvc controller
        var controller = new AppController()
        {
         ControllerContext = new ControllerContext() { 
                   HttpContext = mockHttpContext.Object }
                             };

        // Act
        controller.SetHttpStatusCode(HttpStatusCode.OK);

        //Assert
        mockHttpContext.VerifySet(x => x.Response.StatusCode = It.IsAny<int>());
    }

另外，这里是MakeHttpContext函数

 public static Mock<HttpContextBase> MakeHttpContext(string url)
    {
        var mockHttpContext = new Mock<HttpContextBase>();
        var mockRequest = new Mock<HttpRequestBase>();
        var mockResponse = new Mock<HttpResponseBase>();
        var mockSession = new Mock<HttpSessionStateBase>();

        //request
        mockRequest.Setup(x => x.AppRelativeCurrentExecutionFilePath).Returns(url);
        mockHttpContext.Setup(x => x.Request).Returns(mockRequest.Object);

        //response
        mockResponse.Setup(x => x.ApplyAppPathModifier(It.IsAny<string>())).Returns<string>(x => x);
        mockHttpContext.Setup(x => x.Response).Returns(mockResponse.Object);

        //session
        mockHttpContext.Setup(x => x.Session).Returns(mockSession.Object);

        return mockHttpContext;
    }

我运行测试时，出现以下异常:

    Test method PA.Tests.Controllers.AppControllerTest.SetHttpStatusCode_SetsCorrectStatusCode
threw exception: 


      Moq.MockException: 
        Expected invocation on the mock at least once, 
        but was never performed: x => x.StatusCode = It.IsAny<Int32>()

        Configured setups:
        x => x.StatusCode = It.IsAny<Int32>(), Times.Never
        No invocations performed.

Moq对调用的期望/要求是什么？我已经调试了SetHTTPStatusCode方法，响应对象确实是一个模拟对象，但是Moq坚持认为没有调用。我是否漏掉了什么？

谢谢！

- Kamau Malone

---

也许您可以使用HttpStatusCodeResult？ - archil

Answer 1

你还没有展示你的TestHelpers.MakeHttpContext方法是做什么的，所以有点难理解正在发生什么。

试试像这样：

// Arrange
var mockHttpContext = new Mock<HttpContextBase>();
var response = new Mock<HttpResponseBase>();
mockHttpContext.SetupGet(x => x.Response).Returns(response.Object);

//creates an instance of an asp.net mvc controller
var controller = new AppController()
{
    ControllerContext = new ControllerContext() 
    { 
        HttpContext = mockHttpContext.Object 
    }
};

// Act
controller.SetHttpStatusCode(HttpStatusCode.OK);

//Assert
response.VerifySet(x => x.StatusCode = (int)HttpStatusCode.OK);

- Darin Dimitrov

---

Darin，感谢您的回复。我已经在代码示例中添加了MakeHttpContext方法。看起来我已经涉及到了主要问题，即响应的SetupGet。然而，我仍然遇到了同样的问题。 - Kamau Malone

是的。我也尝试了你的示例。我用你的示例替换了整个测试 - 仍然出现来自 Moq 的相同异常。如果有区别，我正在使用 Moq 4.0。 - Kamau Malone

这真是双倍奇怪。我对整个解决方案进行了清理构建，重新运行了您的代码示例，现在它可以正常工作了。谢谢，Darin！ - Kamau Malone

@DarinDimitrov 我正在尝试做同样的事情，但在以下代码上出现错误：ControllerContext = new ControllerContext() { HttpContext = mockHttpContext.Object 它说无法隐式将类型“System.Web.Mvc.ControllerContext”转换为“System.Web.Http.Controllers.HttpControlerContext”。 - Salman