### Question:
Money implements IMoney { public IMoney multiply(int factor) { return new Money(amount() * factor, currency()); } Money(int amount, String currency); IMoney add(IMoney m); IMoney addMoney(Money m); IMoney addMoneyBag(MoneyBag s); int amount(); String currency(); @Override boolean equals(Object anObject); @Override int hashCode(); boolean isZero(); IMoney multiply(int factor); IMoney negate(); IMoney subtract(IMoney m); @Override String toString(); void appendTo(MoneyBag m);  }### Answer:
@Test public void testSimpleMultiply() { Money expected = new Money(28, "CHF"); assertEquals(expected, f14CHF.multiply(2)); }