test/jdk/java/util/Formatter/spi/NoGroupingUsed.java

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 /*
 * @test
 * @bug 8196399 8202537
 * @summary  test Formatter if any ArithmeticException is thrown while
 * formatting a number in the locale which does not use any
 * grouping, but specifies a grouping separator.
 * @library provider
 * @build provider/module-info provider/test.NumberFormatProviderImpl
 * @run main/othervm -Djava.locale.providers=SPI,COMPAT NoGroupingUsed
 */

import java.util.Formatter;
import java.util.Locale;

public class NoGroupingUsed {

    public static void main(String[] args) {
        Locale locale = new Locale("xx", "YY");
        String number = "1234567";
        String formatString = "%,d";

        try {
            testGrouping(locale, formatString, number);
        } catch (ArithmeticException ex) {
            throw new RuntimeException("[FAILED: ArithmeticException occurred"
                    + " while formatting the number: " + number + ", with"
                    + " format string: " + formatString + ", in locale: "
                    + locale, ex);
        }
    }

    private static void testGrouping(Locale locale, String formatString, String number) {
        // test using String.format
        String result = String.format(locale, formatString, Integer.parseInt(number));
        if (!number.equals(result)) {
            throw new RuntimeException("[FAILED: Incorrect formatting"
                    + " of number: " + number + " using String.format with format"
                    + " string: " + formatString + " in locale: " + locale
                    + ". Actual: " + result + ", Expected: " + number + "]");
        }

        // test using Formatter's format
        StringBuilder sb = new StringBuilder();
        Formatter formatter = new Formatter(sb, locale);
        formatter.format(formatString, Integer.parseInt(number));
        if (!number.equals(sb.toString())) {
            throw new RuntimeException("[FAILED: Incorrect formatting"
                    + " of number: " + number + "using Formatter.format with"
                    + " format string: " + formatString + " in locale: " + locale
                    + ". Actual: " + sb.toString() + ", Expected: " + number + "]");
        }
    }
}