public void VirtualCard_Updates_Balance_In_ThreadSafe()
{
//arrange
var pin = 1234;
var balance = 100M;
var vc = new VirtualCard(pin, balance);
var taskList = new List <Task>();
//act
taskList.Add(Task.Run(async() =>
{
await Task.Delay(99);
await vc.WithdrawMoney(pin, 20);
}));
taskList.Add(Task.Run(async() =>
{
await Task.Delay(150);
await vc.WithdrawMoney(pin, 10);
}));
taskList.Add(Task.Run(async() =>
{
await Task.Delay(33);
await vc.AddMoney(10);
}));
taskList.Add(Task.Run(async() =>
{
await Task.Delay(77);
await vc.AddMoney(10);
}));
Task.WaitAll(taskList.ToArray());
var result = vc.Balance;
//assert
Assert.AreEqual(90, result);
}
public void VirtualCard_Can_TopBalance()
{
//arrange
var balance = 100M;
var topup_amt = 10M;
var vc = new VirtualCard(0, balance);
//act
vc.AddMoney(topup_amt).Wait(new TimeSpan(0, 0, 0, 1));
var result = vc.Balance;
//assert
Assert.AreEqual(balance + topup_amt, result);
}