Chapter 14. Change
$5 + 10 CHF = $10 if rate is 2:1$5 + $5 = $10Return Money from $5 + $5Bank.reduce(Money)Reduce Money with conversionReduce(Bank, String) |
Change is worth embracing (especially if you have a book out with “embrace change” in the title). Here, however, we are thinking about a much simpler form of change—we have two francs and we want a dollar. That sounds like a test case already:
public void testReduceMoneyDifferentCurrency() { Bank bank= new Bank(); bank.addRate("CHF", "USD", 2); Money result= bank.reduce(Money.franc(2), "USD"); assertEquals(Money.dollar(1), result); }
When I convert francs to dollars, I divide by two. (We're still studiously ignoring all of those nasty numerical problems.) We can make the bar ...
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