public void GetPrice_第一集買了一本_其他都沒買_價格應為100_乘_1_等於_100元() { //arrange var target = new ShoppingCart(); var potterBook = new Book { Name = "Potter第一集", Price = 100 }; var expected = 100; target.AddBook(potterBook); //act var actual = target.GetPrice(); //assert Assert.AreEqual(expected, actual); }