{
DecimalFormatSymbols symbols = new DecimalFormatSymbols(Locale.ENGLISH);
symbols.setGroupingSeparator('_');
symbols.setMinusSign('*');
BigIntegerNumericFormatter f = new BigIntegerNumericFormatter(symbols);
BigInteger big = new BigInteger("-123456");
assertEquals(f.parse("*123_456"), big);
assertEquals(f.toClient(big), "*123456");
}