public void GivenAnSavingsAccountWithdrawShouldFailWhenAmmountExceedBalance()
{
BankAccount account = new SavingAccount();
account.Withdraw(500m);
Assert.AreEqual(0, account.Balance);
}
public void GivenASavingAccountWithEnoughBalanceWithrawShouldSucceed()
{
BankAccount account = new SavingAccount();
account.Deposit(10m);
account.Withdraw(5m);
Assert.AreEqual(5m, account.Balance);
}