public void Test_OnionPrice()
        {
            // arrange
            var sut = new OnionTopping();

            // act
            var actual = sut.Price;

            // assert
            Assert.Equal(actual, 0.45m);
        }
        public void Test_OnionToString()
        {
            // arrange
            var sut = new OnionTopping();

            // act
            var actual = sut.Name;

            // assert
            Assert.Equal(actual, "Onion");
        }