public static BtcFormat getSymbolInstance() { return getSymbolInstance(defaultLocale()); }
@Test
    public void prefixTest() { // prefix b/c symbol is prefixed
        BtcFormat usFormat = BtcFormat.getSymbolInstance(Locale.US);
        assertEquals("฿1.00", usFormat.format(COIN));
        assertEquals("฿1.01", usFormat.format(101000000));
        assertEquals("₥฿0.01", usFormat.format(1000));
        assertEquals("₥฿1,011.00", usFormat.format(101100000));
        assertEquals("₥฿1,000.01", usFormat.format(100001000));
        assertEquals("µ฿1,000,001.00", usFormat.format(100000100));
        assertEquals("µ฿1,000,000.10", usFormat.format(100000010));
        assertEquals("µ฿1,000,000.01", usFormat.format(100000001));
        assertEquals("µ฿1.00", usFormat.format(100));
        assertEquals("µ฿0.10", usFormat.format(10));
        assertEquals("µ฿0.01", usFormat.format(1));
    }