@Test
public void testReduceSum() {
Expression sum = new Sum(Money.dollar(3), Money.dollar(4));
Bank bank = new Bank();
Money result = bank.reduce(sum, "USD");
assertEquals(Money.dollar(7), result);
}
@Test
public void testAddition() {
Money five = Money.dollar(5);
Expression sum = five.plus(five);
Bank bank = new Bank();
Money reduced = bank.reduce(sum, "USD");
assertEquals(Money.dollar(10), reduced);
}
@Test
public void testMixedAddiction() {
Expression fiveBucks = Money.dollar(5);
Expression tenFranks = Money.franc(10);
Bank bank = new Bank();
bank.addRate("CHF", "USD", 2);
Money result = bank.reduce(fiveBucks.plus(tenFranks), "USD");
assertEquals(Money.dollar(10), result);
}
@Test
public void testSumTimes() {
Expression fiveBucks = Money.dollar(5);
Expression tenFranks = Money.franc(10);
Bank bank = new Bank();
bank.addRate("CHF", "USD", 2);
Expression sum = new Sum(fiveBucks, tenFranks).times(2);
Money result = bank.reduce(sum, "USD");
assertEquals(Money.dollar(20), result);
}
@Test
public void testReduceMoneyDifferentCurrency() {
Bank bank = new Bank();
bank.addRate("CHF", "USD", 2);
assertEquals(Money.dollar(1), bank.reduce(Money.franc(2), "USD"));
}
@Test
public void testReduceMoney() {
Bank bank = new Bank();
Money result = bank.reduce(Money.dollar(1), "USD");
assertEquals(Money.dollar(1), result);
}