### Question:
MonetaryFormat { public MonetaryFormat digits(char zeroDigit) { if (zeroDigit == this.zeroDigit) return this; else return new MonetaryFormat(negativeSign, positiveSign, zeroDigit, decimalMark, minDecimals, decimalGroups, shift, roundingMode, codes, codeSeparator, codePrefixed); } MonetaryFormat(); private  MonetaryFormat(char negativeSign, char positiveSign, char zeroDigit, char decimalMark, int minDecimals,
            List<Integer> decimalGroups, int shift, RoundingMode roundingMode, String[] codes,
            char codeSeparator, boolean codePrefixed); MonetaryFormat negativeSign(char negativeSign); MonetaryFormat positiveSign(char positiveSign); MonetaryFormat digits(char zeroDigit); MonetaryFormat decimalMark(char decimalMark); MonetaryFormat minDecimals(int minDecimals); MonetaryFormat optionalDecimals(int... groups); MonetaryFormat repeatOptionalDecimals(int decimals, int repetitions); MonetaryFormat shift(int shift); MonetaryFormat roundingMode(RoundingMode roundingMode); MonetaryFormat noCode(); MonetaryFormat code(int codeShift, String code); MonetaryFormat codeSeparator(char codeSeparator); MonetaryFormat prefixCode(); MonetaryFormat postfixCode(); MonetaryFormat withLocale(Locale locale); CharSequence format(Monetary monetary); Coin parse(String str); Fiat parseFiat(String currencyCode, String str); String code(); @Override boolean equals(final Object o); @Override int hashCode(); static final MonetaryFormat BTC; static final MonetaryFormat MBTC; static final MonetaryFormat UBTC; static final MonetaryFormat FIAT; static final String CODE_BTC; static final String CODE_MBTC; static final String CODE_UBTC; static final int MAX_DECIMALS; }### Answer:
@Test public void testDigits() throws Exception { assertEquals("١٢.٣٤٥٦٧٨٩٠", NO_CODE.digits('\u0660').format(Coin.valueOf(1234567890l)).toString()); }