public void GetInventoryList_ShouldReturnAllItems()
        {
            var context = new TestInventory();

            context.InventoryList.Add(new Inventory {
                ID = 1, Name = "Demo1", Description = "desc1", Price = 20
            });
            context.InventoryList.Add(new Inventory {
                ID = 2, Name = "Demo2", Description = "desc2", Price = 30
            });
            context.InventoryList.Add(new Inventory {
                ID = 3, Name = "Demo3", Description = "desc3", Price = 40
            });

            var controller = new InventoriesController(context);
            var result     = controller.GetInventoryList() as TestInventoryDbSet;

            Assert.IsNotNull(result);
            Assert.AreEqual(3, result.Local.Count);
        }