public async Task Add(Topping topping)
        {
            await Toppings.Add(topping);

            var result = await Toppings.Get(topping.Id);

            Assert.Equal(topping, result);
        }
        public async Task Edit(Topping topping, string newName, string newDescription, double newPrice)
        {
            await Toppings.Add(topping);

            topping.Name        = newName;
            topping.Description = newDescription;
            topping.Price       = newPrice;

            await Toppings.Edit(topping);

            var result = await Toppings.Get(topping.Id);

            Assert.Equal(topping, result);
        }