public void WithdrawalTest()
{
var _banking = new Banking();
// Value will stay the same - balance cant drop below 0
_banking.RecordWithdrawal(-65);
Assert.AreEqual(_banking.balance, 50);
_banking.RecordWithdrawal(-10);
Assert.AreEqual(_banking.balance, 40);
// Make sure balance can hit 0
_banking.RecordWithdrawal(-40);
Assert.AreEqual(_banking.balance, 0);
}