You can mock your Request. Something like this (Moq using):
var request = new Mock<HttpRequestBase>();
request.SetupGet(x => x.IsAuthenticated).Returns(true); // or false
var context = new Mock<HttpContextBase>();
context.SetupGet(x => x.Request).Returns(request.Object);
var controller = new YourController();
controller.ControllerContext =
new ControllerContext(context.Object, new RouteData(), controller);
// test
ViewResult viewResult = (ViewResult)controller.SomeAction();
Assert.True(viewResult.ViewName == "ViewForAuthenticatedRequest");
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