public String toFriendlyString() {
        return FRIENDLY_FORMAT.code(0, currencyCode).format(this).toString();
    }
@Test
    public void testToFriendlyString() {
        assertEquals("1.00 EUR", parseFiat("EUR", "1").toFriendlyString());
        assertEquals("1.23 EUR", parseFiat("EUR", "1.23").toFriendlyString());
        assertEquals("0.0010 EUR", parseFiat("EUR", "0.001").toFriendlyString());
        assertEquals("-1.23 EUR", parseFiat("EUR", "-1.23").toFriendlyString());
    }