Bug8202764.java

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 /*
 * @test
 * @bug 8202764
 * @modules jdk.localedata
 * @summary Checks time zone names are consistent with aliased ids,
 *      between DateFormatSymbols.getZoneStrings() and getDisplayName()
 *      of TimeZone/ZoneId classes
 * @run testng/othervm Bug8202764
 */

import static org.testng.Assert.assertEquals;

import java.time.ZoneId;
import java.time.format.TextStyle;
import java.text.DateFormatSymbols;
import java.util.Arrays;
import java.util.Locale;
import java.util.Set;
import java.util.TimeZone;

import org.testng.annotations.Test;

public class Bug8202764 {

    @Test
    public void testAliasedTZs() {
        Set<String> zoneIds = ZoneId.getAvailableZoneIds();
        Arrays.stream(DateFormatSymbols.getInstance(Locale.US).getZoneStrings())
            .forEach(zone -> {
                System.out.println(zone[0]);
                TimeZone tz = TimeZone.getTimeZone(zone[0]);
                assertEquals(zone[1], tz.getDisplayName(false, TimeZone.LONG, Locale.US));
                assertEquals(zone[2], tz.getDisplayName(false, TimeZone.SHORT, Locale.US));
                assertEquals(zone[3], tz.getDisplayName(true, TimeZone.LONG, Locale.US));
                assertEquals(zone[4], tz.getDisplayName(true, TimeZone.SHORT, Locale.US));
                if (zoneIds.contains(zone[0])) {
                    // Some of the ids, e.g. three-letter ids are not supported in ZoneId
                    ZoneId zi = tz.toZoneId();
                    assertEquals(zone[5], zi.getDisplayName(TextStyle.FULL, Locale.US));
                    assertEquals(zone[6], zi.getDisplayName(TextStyle.SHORT, Locale.US));
                }
            });
    }
}