public void QueryByCustomerNameTest()
{
Customer customer1 = new Customer(1, "GYJ");
Customer customer2 = new Customer(2, "SYY");
Good Dior = new Good(1, "Dior", 330.5f);
Good Chanel = new Good(2, "Chanel", 220.6f);
Good TF = new Good(3, "TF", 500.3f);
Order order1 = new Order(1, customer1);
order1.AddPurchase(new Purchase(Dior, 40));
order1.AddPurchase(new Purchase(Chanel, 80));
order1.AddPurchase(new Purchase(TF, 50));
Order order2 = new Order(2, customer2);
order2.AddPurchase(new Purchase(Dior, 40));
order2.AddPurchase(new Purchase(TF, 50));
Order order3 = new Order(3, customer1);
order3.AddPurchase(new Purchase(Dior, 450));
ordersTable.AddOrder(order1);
ordersTable.AddOrder(order2);
ordersTable.AddOrder(order3);
Assert.AreEqual(ordersTable.QueryByCustomerName("GYJ").Count, 2);
Assert.AreEqual(ordersTable.QueryByCustomerName("SYY").Count, 1);
}