Classes for mocking HttpContext in ASP.NET MVC with Moq.

gistfile1.cs

using System.Collections.Generic;
using System.Security.Principal;
using System.Web;
using Moq;

namespace Tests.Utils
{
    public class HttpContextMock
    {
        public HttpContextMock(IEnumerable<KeyValuePair<string, string>> requestParams)
            : this(null, false, requestParams)
        {}

        public HttpContextMock(IPrincipal user = null, bool isAjaxRequest = false, 
            IEnumerable<KeyValuePair<string, string>> requestParams = null)
        {
            Server = new Mock<HttpServerUtilityBase>(MockBehavior.Loose);

            Response = new Mock<HttpResponseBase>(MockBehavior.Strict);
            Response.Setup(res => res.ApplyAppPathModifier(It.IsAny<string>())).Returns((string virtualPath) => virtualPath);
            Response.Setup(res => res.Cookies).Returns(new HttpCookieCollection());

            Request = new Mock<HttpRequestBase>(MockBehavior.Strict);
            Request.Setup(req => req.UserHostAddress).Returns("127.0.0.1");
            Request.Setup(req => req.ApplicationPath).Returns("~/");
            Request.Setup(req => req.AppRelativeCurrentExecutionFilePath).Returns("~/");
            Request.Setup(req => req.PathInfo).Returns(string.Empty);            
            Request.Setup(req => req.Cookies).Returns(new HttpCookieCollection());
            Request.Setup(req => req.QueryString).Returns(new NameValueCollection());
            Request.Setup(req => req.Form).Returns(new NameValueCollection());

            if(isAjaxRequest)
                AddRequestParameter("X-Requested-With", "XMLHttpRequest");

            if(requestParams != null)
                AddRequestParameters(requestParams);

            Session = new HttpSessionMock();
            Items = new Dictionary<object, object>();

            Context = new Mock<HttpContextBase>();
            Context.SetupGet(c => c.Request).Returns(Request.Object);
            Context.SetupGet(c => c.Response).Returns(Response.Object);
            Context.SetupGet(c => c.Server).Returns(Server.Object);
            Context.SetupGet(c => c.Session).Returns(Session);
            Context.SetupGet(c => c.Items).Returns(Items);

            if (user == null) return;

            Context.SetupGet(x => x.User).Returns(user);
            Context.SetupGet(x => x.Request.IsAuthenticated)
                .Returns(user.Identity.IsAuthenticated);
        }

        public HttpContextBase HttpContext { get { return Context.Object; } }

        public Mock<HttpContextBase> Context { get; set; }
        public Mock<HttpServerUtilityBase> Server { get; set; }
        public Mock<HttpResponseBase> Response { get; set; }
        public Mock<HttpRequestBase> Request { get; set; }
        public HttpSessionMock Session { get; set; }
        public Dictionary<object, object> Items { get; set; }

        public void AddRequestParameters(IEnumerable<KeyValuePair<string, string>> parameters)
        {
            foreach (var param in parameters)
            {
                AddRequestParameter(param.Key, param.Value);
            }
        }

        public void AddRequestParameter(string name, string value)
        {
            Request.Setup(r => r[name]).Returns(value);
        }
    }

    public class HttpSessionMock : HttpSessionStateBase
    {
        private readonly Dictionary<string, object> _objects = new Dictionary<string, object>();

        public override object this[string name]
        {
            get { return (_objects.ContainsKey(name)) ? _objects[name] : null; }
            set { _objects[name] = value; }
        }

        public override void Add(string name, object value)
        {
            _objects.Add(name, value);
            base.Add(name, value);
        }

        public override void Remove(string name)
        {
            _objects.Remove(name);
            base.Remove(name);
        }

        public override void Clear()
        {
            _objects.Clear();
            base.Clear();
        }

        public override void RemoveAll()
        {
            Clear();
        }
    }
}