java-topology/test/jdk/java/text/Format/CompactNumberFormat/TestPlurals.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test
 * @bug 8222756
 * @summary Tests plurals support in CompactNumberFormat
 * @run junit/othervm TestPlurals
 */

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

import java.text.CompactNumberFormat;
import java.text.DecimalFormatSymbols;
import java.util.Locale;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;

@TestInstance(TestInstance.Lifecycle.PER_CLASS)
public class TestPlurals {

    private final static DecimalFormatSymbols DFS = DecimalFormatSymbols.getInstance(Locale.ROOT);
    private final static String[] PATTERN = {
            "{zero:0->zero one:0->one two:0->two few:0->few many:0->many other:0->other}"};
    private final static String RULE_1 = "zero:n = 0; one:n = 1; two:n = 2; few:n = 3..4; many:n = 5..6,8";
    private final static String RULE_2 = "one:n   %   2   =    1   or   n   /   3   =   2;";
    private final static String RULE_3 = "one:n%2=0andn/3=2;";


    Object[][] pluralRules() {
        return new Object[][]{
            // rules, number, expected
            {RULE_1, 0, "0->zero"},
            {RULE_1, 1, "1->one"},
            {RULE_1, 2, "2->two"},
            {RULE_1, 3, "3->few"},
            {RULE_1, 4, "4->few"},
            {RULE_1, 5, "5->many"},
            {RULE_1, 6, "6->many"},
            {RULE_1, 7, "7->other"},
            {RULE_1, 8, "8->many"},
            {RULE_1, 9, "9->other"},

            {RULE_2, 0, "0->other"},
            {RULE_2, 1, "1->one"},
            {RULE_2, 2, "2->other"},
            {RULE_2, 3, "3->one"},
            {RULE_2, 4, "4->other"},
            {RULE_2, 5, "5->one"},
            {RULE_2, 6, "6->one"},

            {RULE_3, 0, "0->other"},
            {RULE_3, 1, "1->other"},
            {RULE_3, 2, "2->other"},
            {RULE_3, 3, "3->other"},
            {RULE_3, 4, "4->other"},
            {RULE_3, 5, "5->other"},
            {RULE_3, 6, "6->one"},
        };
    }

    Object[][] invalidRules() {
        return new Object [][] {
            {"one:a = 1"},
            {"on:n = 1"},
            {"one:n = 1...2"},
            {"one:n = 1.2"},
            {"one:n = 1..2,"},
            {"one:n = 1;one:n = 2"},
            {"foo:n = 1"},
            {"one:n = 1..2 andor v % 10 != 0"},
        };
    }

    @Test
    void testNullPluralRules() {
        assertThrows(NullPointerException.class, () -> {
            String[] pattern = {""};
            new CompactNumberFormat("#", DFS, PATTERN, null);
        });
    }

    @ParameterizedTest
    @MethodSource("pluralRules")
    void testPluralRules(String rules, Number n, String expected) {
        var cnp = new CompactNumberFormat("#", DFS, PATTERN, rules);
        assertEquals(expected, cnp.format(n));
    }

    @ParameterizedTest
    @MethodSource("invalidRules")
    void testInvalidRules(String rules) {
        assertThrows(IllegalArgumentException.class,
                () -> new CompactNumberFormat("#", DFS, PATTERN, rules));
    }

    @Test
    void testLimitExceedingRules() {
        assertThrows(IllegalArgumentException.class, () -> {
            String andCond = " and n = 1";
            String invalid = "one: n = 1" + andCond.repeat(2_048 / andCond.length());
            new CompactNumberFormat("#", DFS, PATTERN, invalid);
        });
    }
}