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    <p><a href="https://stackoverflow.com/questions/524457/how-do-you-mock-the-session-object-collection-using-moq">Here</a> is a related discussion.</p> <p>I stopped referencing <code>HttpContext.Current</code> directly. and use this class instead:</p> <pre><code>public class HttpContextFactory { private static HttpContextBase m_context; public static HttpContextBase Current { get { if (m_context != null) return m_context; if (HttpContext.Current == null) throw new InvalidOperationException("HttpContext not available"); return new HttpContextWrapper(HttpContext.Current); } } public static void SetCurrentContext(HttpContextBase context) { m_context = context; } } </code></pre> <p>and use <code>HttpContextFactory.Current</code> instead of <code>HttpContext.Current</code> in our code. </p> <p>Then you write this in your test:</p> <pre><code> HttpContextFactory.SetCurrentContext(GetMockedHttpContext()); </code></pre> <p>where GetMockedHttpContext() is from <a href="http://www.emadibrahim.com/2008/04/04/unit-test-linq-to-sql-in-aspnet-mvc-with-moq/" rel="nofollow noreferrer">here</a> and looks like this:</p> <pre><code> private System.Web.HttpContextBase GetMockedHttpContext() { var context = new Mock&lt;HttpContextBase&gt;(); var request = new Mock&lt;HttpRequestBase&gt;(); var response = new Mock&lt;HttpResponseBase&gt;(); var session = new Mock&lt;HttpSessionStateBase&gt;(); var server = new Mock&lt;HttpServerUtilityBase&gt;(); var user = new Mock&lt;IPrincipal&gt;(); var identity = new Mock&lt;IIdentity&gt;(); context.Setup(ctx =&gt; ctx.Request).Returns(request.Object); context.Setup(ctx =&gt; ctx.Response).Returns(response.Object); context.Setup(ctx =&gt; ctx.Session).Returns(session.Object); context.Setup(ctx =&gt; ctx.Server).Returns(server.Object); context.Setup(ctx =&gt; ctx.User).Returns(user.Object); user.Setup(x =&gt; x.Identity).Returns(identity.Object); identity.Setup(id =&gt; id.IsAuthenticated).Returns(true); identity.Setup(id =&gt; id.Name).Returns("test"); return context.Object; } </code></pre> <p>It uses a <a href="https://stackoverflow.com/questions/64242/rhino-mocks-typemock-moq-or-nmock-which-one-do-you-use-and-why">mocking framework</a> called <a href="http://code.google.com/p/moq/" rel="nofollow noreferrer">moq</a></p> <p>In your test project you have to add a reference to <code>System.Web</code> and <code>System.Web.Abstractions</code>, where <code>HttpContextBase</code> is defined.</p>
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    1. COI've also started doing this (replacing HttpContext with HttpContextFactory), and it really helps with the Unit Testing (I've wrapped this capabilities in an API which you can see here http://o2platform.wordpress.com/2011/04/05/mocking-httpcontext-httprequest-and-httpresponse-for-unittests-using-moq/)
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    2. COI'm not using moq, so this didn't get me to 100%, but it was helpful. I looked at Stephen Walther's fake objects for help: http://stephenwalther.com/archive/2008/07/01/asp-net-mvc-tip-12-faking-the-controller-context.aspx
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