public class FessFunctionsTest extends UnitFessTestCase {
    public void test_formatNumber() {
        assertEquals("0", FessFunctions.formatNumber(0, "###,###"));
        assertEquals("1,000", FessFunctions.formatNumber(1000, "###,###"));
        assertEquals("1,000,000", FessFunctions.formatNumber(1000000, "###,###"));
    }

    public void test_formatFileSize() {

        return DurationFormatUtils.formatDuration(durationMillis, "d 'days' HH:mm:ss.SSS").replace("0 days", StringUtil.EMPTY).trim();

    }

    public static String formatNumber(final long value, final String pattern) {
        final DecimalFormat df = (DecimalFormat) NumberFormat.getNumberInstance(getUserLocale());
        df.applyPattern(pattern);
        return df.format(value);
    }