public void GetCustomerTest()
{
CustomerCRUD.addCustomer(88, "Joan", "Jett");
Assert.AreEqual(CustomerCRUD.GetCustomer(88).customer_f_name, "Joan");
Assert.AreEqual(CustomerCRUD.GetCustomerByLastName("Jett").customer_id, (88));
Assert.AreEqual(CustomerCRUD.GetCustomerByNames("Joan", "Jett").customer_id, 88);
CustomerCRUD.deleteCustomer(88);
}