test/jdk/java/util/Calendar/CalendarDisplayNamesTest.java

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import org.testng.Assert;
import org.testng.annotations.Test;

import java.util.Calendar;
import java.util.Locale;
import java.util.Map;

/**
 * @test
 * @bug 8262108 8174269
 * @summary Verify the results returned by Calendar.getDisplayNames() API
 * @comment Locale providers: CLDR,SPI
 * @run testng/othervm -Djava.locale.providers=CLDR,SPI CalendarDisplayNamesTest
 * @comment Locale providers: default
 * @run testng CalendarDisplayNamesTest
 */
public class CalendarDisplayNamesTest {

    /**
     * Test that the {@link Calendar#getDisplayNames(int, int, Locale)} returns valid field values
     * for the {@link Calendar#AM_PM} field in various locales and styles
     */
    @Test
    public void testAM_PMDisplayNameValues() {
        final int[] styles = new int[]{Calendar.ALL_STYLES, Calendar.SHORT_FORMAT, Calendar.LONG_FORMAT,
                Calendar.SHORT_STANDALONE, Calendar.LONG_STANDALONE, Calendar.SHORT, Calendar.LONG};
        for (final Locale locale : Locale.getAvailableLocales()) {
            for (final int style : styles) {
                final Calendar cal = Calendar.getInstance();
                final Map<String, Integer> names = cal.getDisplayNames(Calendar.AM_PM, style, locale);
                if (names == null) {
                    continue;
                }
                for (final Integer fieldValue : names.values()) {
                    Assert.assertTrue(fieldValue == Calendar.AM || fieldValue == Calendar.PM,
                            "Invalid field value " + fieldValue + " for calendar field AM_PM, in locale "
                                    + locale + " with style " + style);
                }
            }
        }
    }
}