public void GetOrderTest()
{
Good book = new Good(1, "book", 9.9f);
Customer customer5 = new Customer(5, "jams");
Order order5 = new Order(4, customer5);
order5.AddPurchase(new Purchase(book, 1));
ordersTable.AddOrder(order5);
Order getOrder = ordersTable.GetOrder(4);
Assert.AreEqual(order5, getOrder);
}