var foo = new SomeController(); foo.SetFakeControllerContext();

FakeHttpContext

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Security.Principal;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
using Moq;

namespace Tab.Web.Tests
{
    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 MockHttpSession();
            var server = new Mock<HttpServerUtilityBase>();
            var user = new Mock<IPrincipal>();
            //var url = new Mock<UrlHelper>();

            server.Setup(x => x.UrlDecode(It.IsAny<string>())).Returns("user1@fake.dom");

            var cookieCollection = new HttpCookieCollection();

            response.Setup(x => x.Cookies).Returns(cookieCollection);
            request.Setup(x => x.Cookies).Returns(cookieCollection);

            user.Setup(x => x.Identity.Name).Returns("1");

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

            context.Setup(ctx => ctx.User).Returns(user.Object);

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

            request.SetupGet(x => x.ApplicationPath).Returns("/");
            request.SetupGet(x => x.Url).Returns(new Uri("http://localhost/a", UriKind.Absolute));
            request.SetupGet(x => x.ServerVariables).Returns(new NameValueCollection());

            response.Setup(x => x.ApplyAppPathModifier(It.IsAny<string>())).Returns<string>(x => x);
            

            context.SetupGet(x => x.Request).Returns(request.Object);
            context.SetupGet(x => x.Response).Returns(response.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);

            RequestContext requestcontext = new RequestContext(httpContext, new RouteData());

            controller.ControllerContext = context;
            controller.Url = new UrlHelper(requestcontext);
        }

        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)
                .Setup(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.Setup(req => req.QueryString)
                .Returns(GetQueryStringParameters(url));
            mock.Setup(req => req.AppRelativeCurrentExecutionFilePath)
                .Returns(GetUrlFileName(url));
            mock.Setup(req => req.PathInfo)
                .Returns(string.Empty);
        }
    }
    public class MockHttpSession : HttpSessionStateBase
    {
        readonly Dictionary<string, object> sessionStorage = new Dictionary<string, object>();

        public override object this[string name]
        {
            get { return sessionStorage[name]; }
            set { sessionStorage[name] = value; }
        }
    }
}