public void Buy_series1_1_series2_1_series3_1_series4_1_series5_1_should_be_375()
        {
            var shoppingCar = new List <Book>()
            {
                new Book {
                    Series = 1, Count = 1
                },
                new Book {
                    Series = 2, Count = 1
                },
                new Book {
                    Series = 3, Count = 1
                },
                new Book {
                    Series = 4, Count = 1
                },
                new Book {
                    Series = 5, Count = 1
                }
            };
            var target   = new DiscountCalcualtor();
            var expected = 375;

            var actual = target.CalculatePayoutMoney(shoppingCar);

            Assert.AreEqual(expected, actual);
        }
        public void Buy_series1_1_should_be_100()
        {
            var shoppingCar = new List <Book>()
            {
                new Book {
                    Series = 1, Count = 1
                }
            };
            var target   = new DiscountCalcualtor();
            var expected = 100;

            var actual = target.CalculatePayoutMoney(shoppingCar);

            Assert.AreEqual(expected, actual);
        }