Intellij Java方法没有在if else方法中使用

Question

所以我试图设计一张持有美分和积分的现金卡。因此，当您花2000美分时，您将获得2000积分（1：1比率），这些积分将自动兑换为10美分现金返还。您需要在卡中至少有2000积分才能兑换现金。只有在添加任何现金返还之前有足够的资金支付整个购买时，您才能使用该卡。我遇到的问题是，积分不会从卡的积分余额中扣除，也不会提供现金返还。我想知道我的代码中是否有任何地方让我搞砸了。感谢

public static int POINTS_NEEDED_FOR_CASH_BACK = 2000;    // points needed to get cash-back reward
public static int REWARD_POINTS_PER_CENT_CHARGED = 1;    // points earned for each cent charged to card
public static int CASH_BACK_REWARD = 10;                 // reward in cents


private int NUMBER_OF_CASH_BACKS;
private int POINTS_ON_CARD;
private int initialBalance; //must be integer larger or equal to 0

public boolean makePurchase(int amount) {


    if (amount < initialBalance) {
        initialBalance = (initialBalance - amount);
        POINTS_ON_CARD = (POINTS_ON_CARD + (amount * REWARD_POINTS_PER_CENT_CHARGED));

        if (POINTS_ON_CARD > POINTS_NEEDED_FOR_CASH_BACK) {
            NUMBER_OF_CASH_BACKS = POINTS_ON_CARD / POINTS_NEEDED_FOR_CASH_BACK;
            POINTS_ON_CARD -= (NUMBER_OF_CASH_BACKS * POINTS_NEEDED_FOR_CASH_BACK);
            initialBalance += (NUMBER_OF_CASH_BACKS * CASH_BACK_REWARD);
        }

        return true;

    }

    return false;
}

这是我的测试，我跑了，因为我想找到一种方法来返回新的点值，所以它没有完整。

public void testPurchase3（）

{         //当卡上的现金余额足够且有足够的现金返还点时

    int oldBalance = testCard.getBalance();
    int oldPOINTS_ON_CARD = testCard.getRewardPoints();

    testCard.makePurchase(2000);

    assertEquals(oldBalance - 2000 , testCard.getBalance());

    assertEquals(testCard.getRewardPoints() ,
            oldPOINTS_ON_CARD + (2000 * FoodServicesCard.REWARD_POINTS_PER_CENT_CHARGED));

    assertTrue(testCard.getRewardPoints() >= FoodServicesCard.POINTS_NEEDED_FOR_CASH_BACK);