// Problem 5. Transactional ATM Withdrawal
public static void WithdrawMoney(decimal amount, string cardPin, string cardNumber)
{
using (var atmEntities = new ATMEntities())
{
using (var transaction = atmEntities.Database.BeginTransaction())
{
var currentCard = atmEntities.CardAccounts
.FirstOrDefault(c => c.CardNumber == cardNumber && c.CardPIN == cardPin);
if (currentCard == null)
{
transaction.Rollback();
throw new ArgumentNullException("There are no Card Account in database with this Pin and card number.");
}
if (currentCard.CardCash < amount)
{
transaction.Rollback();
throw new InvalidOperationException("You dont have enought money.");
}
currentCard.CardCash -= amount;
LogWithdrawalTransaction(cardNumber, amount);
atmEntities.SaveChanges();
transaction.Commit();
Console.WriteLine("Transaction completed.");
}
}
}
public void ShouldTryToWithdrawalAmountForWrongCardNumberAndPin()
{
using (var atmEntities = new ATMEntities())
{
var atmAccount = atmEntities.CardAccounts.FirstOrDefault(a => a.CardNumber == newCardAccount.CardNumber);
AtmDAO.WithdrawMoney(AmountBiggerThanCash, "123", "32221145");
}
}
public void ShouldTryToWithdrawalAmountBiggerThanCash()
{
using (var atmEntities = new ATMEntities())
{
var atmAccount = atmEntities.CardAccounts.FirstOrDefault(a => a.CardNumber == newCardAccount.CardNumber);
AtmDAO.WithdrawMoney(AmountBiggerThanCash, newCardAccount.CardPIN, newCardAccount.CardNumber);
}
}
public void TestInitialize()
{
this.newCardNumber = new Random().Next(1, 999999999).ToString();
this.newCardAccount = new CardAccount {CardCash = 10000, CardNumber = newCardNumber, CardPIN = "4321"};
using (var atmEntities = new ATMEntities())
{
atmEntities.CardAccounts.Add(newCardAccount);
atmEntities.SaveChanges();
}
}
// Problem 6. ATM Transactions History
private static void LogWithdrawalTransaction(string cardNumber, decimal amount)
{
using (var atmEntities = new ATMEntities())
{
atmEntities.TransactionHistories.Add(new TransactionHistory
{
Amount = amount,
CardNumber = cardNumber,
TransactionDate = DateTime.Now
});
atmEntities.SaveChanges();
}
}
public void ShouldWithdrawalSumFromAccountAndAddTransactionHistoryForThem()
{
using (var atmEntities = new ATMEntities())
{
AtmDAO.WithdrawMoney(Amount, newCardAccount.CardPIN, newCardAccount.CardNumber);
}
using (var atmEntities = new ATMEntities())
{
var modifiedCardAccount =
atmEntities.CardAccounts.FirstOrDefault(c => c.CardNumber == newCardNumber);
var historyForWithdrawal =
atmEntities.TransactionHistories.FirstOrDefault(h => h.CardNumber == newCardAccount.CardNumber);
Assert.AreEqual(modifiedCardAccount.CardCash, newCardAccount.CardCash - Amount);
Assert.AreEqual(modifiedCardAccount.CardNumber, newCardAccount.CardNumber);
Assert.AreEqual(modifiedCardAccount.CardPIN, newCardAccount.CardPIN);
Assert.AreEqual(historyForWithdrawal.Amount, Amount);
Assert.AreEqual(historyForWithdrawal.CardNumber, newCardAccount.CardNumber);
}
}
