public void AddToFavourite()
{
var controllerContext = new Mock <ControllerContext>();
var principal = new Mock <IPrincipal>();
principal.Setup(p => p.IsInRole("Administrator")).Returns(true);
principal.SetupGet(x => x.Identity.Name).Returns("rr");
controllerContext.SetupGet(x => x.HttpContext.User).Returns(principal.Object);
controller.ControllerContext = controllerContext.Object;
RedirectToRouteResult result = controller.AddToFavourite(1) as RedirectToRouteResult;
Assert.IsTrue(result != null);
}