Question

嗯，我有一个货币对象，允许我添加其他货币对象。我在java中尝试assertEquals()来测试我的代码是否合适，但后来失败了。

我非常肯定我的代码是正确的（System.out.println返回正确的答案），我想我只是以错误的方式使用assertEquals。 T_T

如果我想知道测试是否myObj1 == myObj2，我究竟能使用什么？

**in my test.java**    
assertEquals(new Money(money1.getCurrency(),new Value(22,70)),money1.add(money2));

**in my money class**
public class Money {
    Currency currency;
    Value value;

    //constructor for Money class
    public Money(Currency currency, Value value) {
        super();
        this.currency = currency;
        this.value = value;
    }

    public Currency getCurrency() {
        return currency;
    }

    public void setCurrency(Currency currency) {
        this.currency = currency;
    }

    //must have same currency
    public Money add(Money moneyToBeAdded){
        Money result = new Money(moneyToBeAdded.currency, new Value(0,0));
        Value totalInCents;
        int tempCents;
        int tempDollars;

        if(compareCurrency(moneyToBeAdded)){
            totalInCents = new Value(0,moneyToBeAdded.value.toCents()+value.toCents());
            tempDollars = (totalInCents.toDollars().getDollar());
            tempCents = (totalInCents.toDollars().getCents());

            result = new Money(moneyToBeAdded.currency, new Value(tempDollars,tempCents));
            System.out.println(result.value.getDollar()+"."+result.value.getCents());
        }
        return result;
    }

    private boolean compareCurrency(Money money){
        return (money.currency.equals(currency))? true : false;
    }
}

Answer 1

您没有从Money类中的Object类重写equals()方法。如果是这样，则通过它们的引用来比较对象，在这种情况下它们是不同的。 Here您可以找到实施equals的规则。

Answer 2

您可以编写测试来比较字段：

Money m1 = new Money(money1.getCurrency(),new Value(22,70));
Money m2 = new Money(money1.getCurrency(),new Value(22,70)).add(money2);

assertEquals("currencies differ", m1.getCurrency(), m2.getCurrency());
assertEquals("values differ",  m1.getValue(), m2.getValue());

assertEquals（obj，obj）返回失败的测试

2 个答案: