在测试初始化​​方法中模拟HttpContext.Current

时间:2010-12-07 17:08:18

标签: c# unit-testing mocking httpcontext

我正在尝试将单元测试添加到我构建的ASP.NET MVC应用程序中。在我的单元测试中,我使用以下代码:

[TestMethod]
public void IndexAction_Should_Return_View() {
    var controller = new MembershipController();
    controller.SetFakeControllerContext("TestUser");

    ...
}

使用以下帮助程序来模拟控制器上下文:

public static class FakeControllerContext {
    public static HttpContextBase FakeHttpContext(string username) {
        var context = new Mock<HttpContextBase>();

        context.SetupGet(ctx => ctx.Request.IsAuthenticated).Returns(!string.IsNullOrEmpty(username));

        if (!string.IsNullOrEmpty(username))
            context.SetupGet(ctx => ctx.User.Identity).Returns(FakeIdentity.CreateIdentity(username));

        return context.Object;
    }

    public static void SetFakeControllerContext(this Controller controller, string username = null) {
        var httpContext = FakeHttpContext(username);
        var context = new ControllerContext(new RequestContext(httpContext, new RouteData()), controller);
        controller.ControllerContext = context;
    }
}

此测试类继承自具有以下内容的基类:

[TestInitialize]
public void Init() {
    ...
}

在这个方法中,它调用了一个库(我无法控制),它试图运行以下代码:

HttpContext.Current.User.Identity.IsAuthenticated

现在你可能已经看到了问题。我已经针对控制器设置了假的HttpContext,但是没有在这个基本的Init方法中。单元测试/嘲笑对我来说很新,所以我想确保我做对了。对我来说,模拟HttpContext的正确方法是什么,以便在我的控制器和我的Init方法中调用的任何库之间共享它。

4 个答案:

答案 0 :(得分:333)

HttpContext.Current会返回System.Web.HttpContext的实例,该实例不会延伸System.Web.HttpContextBase。后来添加了HttpContextBase以解决难以模拟的HttpContext问题。这两个类基本上是不相关的(HttpContextWrapper用作它们之间的适配器。)

幸运的是,HttpContext本身就是假的,足以替换IPrincipal(用户)和IIdentity

以下代码按预期运行,即使在控制台应用程序中也是如此:

HttpContext.Current = new HttpContext(
    new HttpRequest("", "http://tempuri.org", ""),
    new HttpResponse(new StringWriter())
    );

// User is logged in
HttpContext.Current.User = new GenericPrincipal(
    new GenericIdentity("username"),
    new string[0]
    );

// User is logged out
HttpContext.Current.User = new GenericPrincipal(
    new GenericIdentity(String.Empty),
    new string[0]
    );

答案 1 :(得分:29)

以下测试初始化​​也将完成这项工作。

[TestInitialize]
public void TestInit()
{
  HttpContext.Current = new HttpContext(new HttpRequest(null, "http://tempuri.org", null), new HttpResponse(null));
  YourControllerToBeTestedController = GetYourToBeTestedController();
}

答案 2 :(得分:4)

如果您的应用程序第三方在内部重定向,那么最好以下面的方式模拟HttpContext:

HttpWorkerRequest initWorkerRequest = new SimpleWorkerRequest("","","","",new StringWriter(CultureInfo.InvariantCulture));
System.Web.HttpContext.Current = new HttpContext(initWorkerRequest);
System.Web.HttpContext.Current.Request.Browser = new HttpBrowserCapabilities();
System.Web.HttpContext.Current.Request.Browser.Capabilities = new Dictionary<string, string> { { "requiresPostRedirectionHandling", "false" } };

答案 3 :(得分:4)

我知道这是一个较旧的主题,但是我们会定期对单元测试的MVC应用进行模拟。

我只想添加我的经验在升级到Visual Studio 2013之后使用Moq 4模拟MVC 3应用程序。没有任何单元测试在调试模式下工作,并且HttpContext显示&#34;无法评估表达式&#34 ;在试图查看变量时。

原来,visual studio 2013在评估某些对象方面存在问题。为了让调试模拟的Web应用程序再次运行,我必须检查&#34;使用托管兼容模式&#34;在工具=&gt;选项=&gt;调试=&gt;常规设置。

我通常做这样的事情:

public static class FakeHttpContext
{
    public static void SetFakeContext(this Controller controller)
    {

        var httpContext = MakeFakeContext();
        ControllerContext context =
        new ControllerContext(
        new RequestContext(httpContext,
        new RouteData()), controller);
        controller.ControllerContext = context;
    }


    private static HttpContextBase MakeFakeContext()
    {
        var context = new Mock<HttpContextBase>();
        var request = new Mock<HttpRequestBase>();
        var response = new Mock<HttpResponseBase>();
        var session = new Mock<HttpSessionStateBase>();
        var server = new Mock<HttpServerUtilityBase>();
        var user = new Mock<IPrincipal>();
        var identity = new Mock<IIdentity>();

        context.Setup(c=> c.Request).Returns(request.Object);
        context.Setup(c=> c.Response).Returns(response.Object);
        context.Setup(c=> c.Session).Returns(session.Object);
        context.Setup(c=> c.Server).Returns(server.Object);
        context.Setup(c=> c.User).Returns(user.Object);
        user.Setup(c=> c.Identity).Returns(identity.Object);
        identity.Setup(i => i.IsAuthenticated).Returns(true);
        identity.Setup(i => i.Name).Returns("admin");

        return context.Object;
    }


}

启动像这样的上下文

FakeHttpContext.SetFakeContext(moController);

直接在控制器中调用Method

long lReportStatusID = -1;
var result = moController.CancelReport(lReportStatusID);