public async Task Test_TopUp_FailOnBalanceOverflow()
{
CashCard cashCard = new CashCard();
// add an initial balance of 1,000
var addInitialBalanceSuccess = await cashCard.TopUp(1234, 1000M);
Assert.IsTrue(addInitialBalanceSuccess);
var initialBalance = cashCard.Balance;
// now try to top up with an amount equal to the max decimal value - will throw an OverflowException
var topUpAmount = Decimal.MaxValue;
Assert.That(async() => await cashCard.TopUp(1234, topUpAmount),
Throws.TypeOf <OverflowException>());
// confirm balance is unchanged
Assert.AreEqual(initialBalance, cashCard.Balance);
}
public void CardTopUpIsThreadSafe()
{
var card = new CashCard(0);
Action <int> deduct = x => { card.TopUp(10); };
Parallel.For(0, 10000, deduct);
Assert.AreEqual(100000, card.Balance);
}
public async Task Test_TopUp_FailOnPin()
{
CashCard cashCard = new CashCard();
var initialBalance = cashCard.Balance;
// topup by 1,000
var topupSuccess = await cashCard.TopUp(4321, 1000M);
Assert.IsFalse(topupSuccess);
Assert.AreEqual(initialBalance, cashCard.Balance);
}
public async Task Test_TopUp_Basic()
{
CashCard cashCard = new CashCard();
var initialBalance = cashCard.Balance;
var topUpAmount = 1000M;
var topUpSuccess = await cashCard.TopUp(1234, topUpAmount);
Assert.IsTrue(topUpSuccess);
Assert.AreEqual(initialBalance + topUpAmount, cashCard.Balance);
}
public async Task Test_Withdraw_FailOnPin()
{
CashCard cashCard = new CashCard();
// add an initial balance of 10,000
var addInitialBalanceSuccess = await cashCard.TopUp(1234, 10000M);
Assert.IsTrue(addInitialBalanceSuccess);
// try to withdraw 1,000 but use a wrong PIN
var initialBalance = cashCard.Balance;
var withdrawAmount = 1000M;
var withdrawSuccess = await cashCard.Withdraw(4321, withdrawAmount);
Assert.IsFalse(withdrawSuccess);
Assert.AreEqual(initialBalance, cashCard.Balance);
}
public async Task Test_Withdraw_FailOnInsufficientBalance()
{
CashCard cashCard = new CashCard();
// add an initial balance of 500
var addInitialBalanceSuccess = await cashCard.TopUp(1234, 500M);
Assert.IsTrue(addInitialBalanceSuccess);
// try to withdraw 1,000
var initialBalance = cashCard.Balance;
var withdrawAmount = 1000M;
Assert.That(async() => await cashCard.Withdraw(1234, withdrawAmount),
Throws.TypeOf <TaskCanceledException>());
Assert.AreEqual(initialBalance, cashCard.Balance);
}
public async Task Test_Withdraw_Basic()
{
CashCard cashCard = new CashCard();
// add an initial balance of 10,000
var addInitialBalanceSuccess = await cashCard.TopUp(1234, 10000M);
Assert.IsTrue(addInitialBalanceSuccess);
// try to withdraw 1,000
var initialBalance = cashCard.Balance;
var withdrawAmount = 1000M;
var withdrawSuccess = await cashCard.Withdraw(1234, withdrawAmount);
Assert.IsTrue(withdrawSuccess);
Assert.AreEqual(initialBalance - withdrawAmount, cashCard.Balance);
}
public async Task Test_Withdraw_FromMultipleSourcesOneWrongPin()
{
CashCard cashCard = new CashCard();
var addInitialBalanceSuccess = await cashCard.TopUp(1234, 10000M);
var initialBalance = cashCard.Balance;
var task1 = cashCard.Withdraw(1234, 100M);
var task2 = cashCard.Withdraw(1234, 500M);
var task3 = cashCard.Withdraw(4321, 1000M);
var task4 = cashCard.Withdraw(1234, 10M);
var task5 = cashCard.Withdraw(1234, 50M);
var results = await Task.WhenAll(task1, task2, task3, task4, task5);
Assert.IsTrue(results[0]);
Assert.IsTrue(results[1]);
Assert.IsFalse(results[2]);
Assert.IsTrue(results[3]);
Assert.IsTrue(results[4]);
Assert.AreEqual(initialBalance - 100M - 500M - 10M - 50M, cashCard.Balance);
}
static void Main(string[] args)
{
var vendingMachine = new VendingMachine();
var card = new CashCard(300);
bool run = true;
while (run)
{
System.Console.Title = " Han Wei Teo : CS Test";
System.Console.ForegroundColor = ConsoleColor.White;
System.Console.WriteLine("========== Welcome To CS Vending Machine =========");
System.Console.WriteLine("| Cans Avail : {0} |", vendingMachine.Inventory);
System.Console.WriteLine("| Card Balance : {0} |", card.Balance);
System.Console.WriteLine("======== [Please Select An Option] =========");
System.Console.ForegroundColor = ConsoleColor.Green;
System.Console.WriteLine("======== Press 1 - Buy Can =========");
System.Console.WriteLine("======== Press 2 - Top Up Card (100) =========");
System.Console.WriteLine("======== Press 3 - Refill Machine =========");
System.Console.WriteLine("======== Press 4 - Quit =========");
System.Console.ForegroundColor = ConsoleColor.White;
System.Console.WriteLine("====================================================");
var option = System.Console.ReadKey();
switch (option.KeyChar)
{
case '1':
try
{
vendingMachine.BuyCan(card);
System.Console.ForegroundColor = ConsoleColor.Blue;
System.Console.WriteLine("=============== Vending...... ==================");
Thread.Sleep(500);
}
catch (InsufficientFundsException)
{
System.Console.ForegroundColor = ConsoleColor.Red;
System.Console.WriteLine("============= Not enough funds on card!! ==============");
Thread.Sleep(500);
}
catch (VendingMachineEmptyException)
{
System.Console.ForegroundColor = ConsoleColor.Red;
System.Console.WriteLine("=============== Out Of Stock!! ================");
Thread.Sleep(500);
}
break;
case '2':
card.TopUp(100);
System.Console.ForegroundColor = ConsoleColor.Blue;
System.Console.WriteLine("=============== Topping Up...... ==================");
Thread.Sleep(500);
break;
case '3':
vendingMachine = new VendingMachine();
System.Console.ForegroundColor = ConsoleColor.Blue;
System.Console.WriteLine("=============== Refilling ...... ==================");
Thread.Sleep(500);
break;
case '4':
run = false;
System.Console.ForegroundColor = ConsoleColor.Red;
System.Console.WriteLine("=============== Bye !! ==================");
Thread.Sleep(500);
break;
default:
break;
}
System.Console.Clear();
}
}
