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I have a controller in C# using the ASP.Net MVC framework public class HomeController:Controller{ public ActionResult Index() { if (Request.IsAjaxRequest()) { //do some ajaxy stuff } return View("Index"); } } I got some tips on mocking and was hoping to test the code with the following and RhinoMocks var mocks = new MockRepository(); var mockedhttpContext = mocks.DynamicMock<HttpContextBase>(); var mockedHttpRequest = mocks.DynamicMock<HttpRequestBase>(); SetupResult.For(mockedhttpContext.Request).Return(mockedHttpRequest); var controller = new HomeController(); controller.ControllerContext = new ControllerContext(mockedhttpContext, new RouteData(), controller); var result = controller.Index() as ViewResult; Assert.AreEqual("About", result.ViewName); However I keep getting this error: Exception System.ArgumentNullException: System.ArgumentNullException : Value cannot be null. Parameter name: request at System.Web.Mvc.AjaxRequestExtensions.IsAjaxRequest(HttpRequestBase request) Since the Request object on the controller has no setter. I tried to get this test working properly by using recommended code from an answer below. This used Moq instead of RhinoMocks, and in using Moq I use the following for the same test: var request = new Mock<HttpRequestBase>(); // Not working - IsAjaxRequest() is static extension method and cannot be mocked // request.Setup(x => x.IsAjaxRequest()).Returns(true /* or false */); // use this request.SetupGet(x => x.Headers["X-Requested-With"]).Returns("XMLHttpRequest"); var context = new Mock<HttpContextBase>(); context.SetupGet(x => x.Request).Returns(request.Object); var controller = new HomeController(Repository, LoginInfoProvider); controller.ControllerContext = new ControllerContext(con

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