test/jdk/java/text/Format/ChoiceFormat/Bug4387255.java

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/*
 * @test
 * @bug 4387255
 * @summary Verifies that ChoiceFormat can handle large numbers of choices
 *          (previously capped at 30).
 * @run junit Bug4387255
 */

import java.text.ChoiceFormat;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.params.provider.Arguments.arguments;

public class Bug4387255 {
    private static final double[] doubles = {
            0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
            10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
            20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
            30, 31, 32, 33, 34, 35};

    private static final String[] strings = {
            "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
            "A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
            "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T",
            "U", "V", "W", "X", "Y", "Z"};

    private static final String pattern =
            "0#0|1#1|2#2|3#3|4#4|5#5|6#6|7#7|8#8|9#9" +
            "|10#A|11#B|12#C|13#D|14#E|15#F|16#G|17#H|18#I|19#J" +
            "|20#K|21#L|22#M|23#N|24#O|25#P|26#Q|27#R|28#S|29#T" +
            "|30#U|31#V|32#W|33#X|34#Y|35#Z";

    private static final ChoiceFormat choiceFormat1 = new ChoiceFormat(doubles, strings);
    private static final ChoiceFormat choiceFormat2 = new ChoiceFormat(pattern);

    // Ensure that both the large ChoiceFormats format each value properly
    @ParameterizedTest
    @MethodSource
    public void largeChoicesTest(double db, String expectedString) {
        String result = choiceFormat2.format(db);
        assertEquals(expectedString, result,
                "Wrong format result with: " + choiceFormat2);
    }


    /*
     * Create arguments in form of : (double, string)
     * Each string is the expected result of ChoiceFormat.format(double)
     */
    private static Arguments[] largeChoicesTest() {
        Arguments[] doublesAndStrings = new Arguments[doubles.length];
        for (int i = 0; i < doubles.length; i++) {
            doublesAndStrings[i] = arguments(doubles[i], strings[i]);
        }
        return doublesAndStrings;
    }

    /*
     * Check that creating a ChoiceFormat with limits and formats arrays
     * equivalent to a string pattern are equal. (Checks that both constructors
     * allow for a large number of choices and formats)
     */
    @Test
    public void patternEqualsArraysTest() {
        assertEquals(choiceFormat1, choiceFormat2, "Pattern is equivalent to " +
                "formats and limits, but ChoiceFormats are not equal");
    }
}