public void Indicates_Selected_Category()
        {
            // Arrange
            Mock<IProductsRepository> mock = new Mock<IProductsRepository>();
            mock.Setup(m => m.Products).Returns(new Product[]
                {
                    new Product {ProductID = 1, Name = "P1", Category = "Apples"},
                    new Product {ProductID = 2, Name = "P2", Category = "Oranges"}
                }.AsQueryable());
            NavController target = new NavController(mock.Object);
            string categoryToSelect = "Apples";

            // Action
            string result = target.Menu(categoryToSelect).ViewBag.SelectedCategory;

            // Assert
            Assert.AreEqual(categoryToSelect, result);
        }
        public void Can_Create_Categories()
        {
            // Arrange
            Mock<IProductsRepository> mock = new Mock<IProductsRepository>();
            mock.Setup(m => m.Products).Returns(new Product[]
                {
                    new Product {ProductID = 1, Name = "P1", Category = "Apples"},
                    new Product {ProductID = 2, Name = "P2", Category = "Apples"},
                    new Product {ProductID = 3, Name = "P3", Category = "Plums"},
                    new Product {ProductID = 4, Name = "P4", Category = "Oranges"}
                }.AsQueryable());
            NavController target = new NavController(mock.Object);

            // Act
            string[] results = ((IEnumerable<string>)target.Menu().Model).ToArray();

            // Assert
            Assert.AreEqual(results.Length, 3);
            Assert.AreEqual(results[0], "Apples");
            Assert.AreEqual(results[1], "Oranges");
            Assert.AreEqual(results[2], "Plums");
        }