[TestMethod]//Add the book to order from available book window and check if the number of book in order equal to our expected value
public void TestAddToOrder1()
{
uid = 9;
String order_isbn = "161729134";
String order_title = "NULLC## in Depth";
double order_unitPrice = 41.22;
int quantity = 2;
int expectedCount = 1;
bookOrder = new BookOrder();
bookOrder.AddItem(new OrderItem(order_isbn, order_title, order_unitPrice, quantity));
Assert.AreEqual(expectedCount, bookOrder.OrderItemList.Count);
}
