public void Categories()
{
var mockService = new Mock <INorthwindService>();
mockService.Setup(s => s.Categories).Returns(categories());
var controller = new HomeController(mockService.Object, null, null, null);
var result = controller.Categories() as ViewResult;
var model = result.ViewData.Model as List <Category>;
Assert.IsInstanceOfType(result, typeof(ViewResult));
Assert.IsInstanceOfType(result.Model, typeof(List <Category>));
Assert.AreEqual(3, model.Count);
}
