动作过滤器的 ASP.NET MVC 测试

如何为操作过滤器编写测试用例？我正在使用表单身份验证。 我有用 RequiresAuthentication 操作过滤器装饰的基本控制器。当我执行控制器的测试用例时，我没有从 cookie 中获取登录用户的数据。

我正在使用起订量；它是否提供了实现我的目标的方法？

This 博客文章 http://www.hanselman.com/blog/ASPNETMVCSessionAtMix08TDDAndMvcMockHelpers.aspx来自 Scott Hanselmann 的 MvcMockHelpers 介绍包括FakeHttpContext对于不同的模拟框架还有 Moq：

using System;
using System.Web;
using System.Text.RegularExpressions;
using System.IO;
using System.Collections.Specialized;
using System.Web.Mvc;
using System.Web.Routing;
using Moq;

namespace UnitTests
{
    public static class MvcMockHelpers
    {
        public static HttpContextBase FakeHttpContext()
        {
            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>();

            context.Expect(ctx => ctx.Request).Returns(request.Object);
            context.Expect(ctx => ctx.Response).Returns(response.Object);
            context.Expect(ctx => ctx.Session).Returns(session.Object);
            context.Expect(ctx => ctx.Server).Returns(server.Object);

            return context.Object;
        }

        public static HttpContextBase FakeHttpContext(string url)
        {
            HttpContextBase context = FakeHttpContext();
            context.Request.SetupRequestUrl(url);
            return context;
        }

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

        static string GetUrlFileName(string url)
        {
            if (url.Contains("?"))
                return url.Substring(0, url.IndexOf("?"));
            else
                return url;
        }

        static NameValueCollection GetQueryStringParameters(string url)
        {
            if (url.Contains("?"))
            {
                NameValueCollection parameters = new NameValueCollection();

                string[] parts = url.Split("?".ToCharArray());
                string[] keys = parts[1].Split("&".ToCharArray());

                foreach (string key in keys)
                {
                    string[] part = key.Split("=".ToCharArray());
                    parameters.Add(part[0], part[1]);
                }

                return parameters;
            }
            else
            {
                return null;
            }
        }

        public static void SetHttpMethodResult(this HttpRequestBase request, string httpMethod)
        {
            Mock.Get(request)
                .Expect(req => req.HttpMethod)
                .Returns(httpMethod);
        }

        public static void SetupRequestUrl(this HttpRequestBase request, string url)
        {
            if (url == null)
                throw new ArgumentNullException("url");

            if (!url.StartsWith("~/"))
                throw new ArgumentException("Sorry, we expect a virtual url starting with \"~/\".");

            var mock = Mock.Get(request);

            mock.Expect(req => req.QueryString)
                .Returns(GetQueryStringParameters(url));
            mock.Expect(req => req.AppRelativeCurrentExecutionFilePath)
                .Returns(GetUrlFileName(url));
            mock.Expect(req => req.PathInfo)
                .Returns(string.Empty);
        }
    }
}

ASP.NET MVC 测试助手的另一个好资源是MvcContrib http://mvccontrib.codeplex.com/CodePlex 上的项目。

当你拥有一个FakeHttpContext您可以测试您的操作过滤器：

var context = new ActionExecutedContext();
context.HttpContext = MvcMockHelpers.FakeHttpContext();
context.Result = new EmpytResult(); // or whatever the default result should be

var filter = new MyCustomAttribute();
filter.OnActionExecuted(context);

Assert.True(context.Result is EmpytResult);
...