public void Add_To_Empty_Cart_test()
{
CartItem cartItem = new CartItem();
Product product1 = new Product("Apple", 100);
Product product2 = new Product("Banana", 200);
cartItem.AddItem(product1);
cartItem.AddItem(product2);
Dictionary <Product, int> dictionaryExpected = new Dictionary <Product, int>()
{
{ product1, 1 },
{ product2, 1 }
};
Assert.Equal(dictionaryExpected, cartItem.ItemList());
}