6 Pasos Finales

Veamos los ultimos pasos para mejorar el codigo al maximo.

En estos tres ultimos pasos veremos como mejorar aun mas el codigo.

@Test
public void testMixedAddition() {
    Expression fiveBucks = Money.dollar(5);
    Expression tenFrancs = Money.franc(10);
    Bank bank = new Bank();
    bank.addRate("CHF", "USD", 2);
    Money result = bank.reduce(fiveBucks.plus(tenFrancs), "USD");
    assertEquals(Money.dollar(10), result);
}

@Test
public void testSumPlusMoney() {
    Expression fiveBucks = Money.dollar(5);
    Expression tenFrancs = Money.franc(10);
    Bank bank = new Bank();
    bank.addRate("CHF", "USD", 2);
    Expression sum = new Sum(fiveBucks, tenFrancs).plus(fiveBucks);
    Money result = bank.reduce(sum, "USD");
    assertEquals(Money.dollar(15), result);
}

@Test
public void testSumTimes() {
    Expression fiveBucks = Money.dollar(5);
    Expression tenFrancs = Money.franc(10);
    Bank bank = new Bank();
    bank.addRate("CHF", "USD", 2);
    Expression sum = new Sum(fiveBucks, tenFrancs).times(2);
    Money result = bank.reduce(sum, "USD");
    assertEquals(Money.dollar(20), result);
}