public void should_withdraw_money_from_account_when_minimum_balance_is_maintained()
        {
            CheckingAccount account = new CheckingAccount(300);

            account.Withdraw(50);

            Assert.That(account.Balance, Is.EqualTo(250));
        }
        public void should_not_withdraw_money_from_account_when_minimum_balance_is_not_maintained()
        {
            CheckingAccount account = new CheckingAccount(300);

            account.Withdraw(200);
        }