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Java example source code file (TestGJChronology.java)

This example Java source code file (TestGJChronology.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

asia/tokyo, constructed, datemidnight, datetime, datetimezone, europe/london, gjchronology, illegalargumentexception, instant, suppresswarnings, testcase, testgjchronology, timeofday, util, yearmonthday

The TestGJChronology.java Java example source code

/*
 *  Copyright 2001-2014 Stephen Colebourne
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.joda.time.chrono;

import java.util.Locale;
import java.util.TimeZone;

import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.joda.time.Chronology;
import org.joda.time.DateMidnight;
import org.joda.time.DateTime;
import org.joda.time.DateTimeConstants;
import org.joda.time.DateTimeUtils;
import org.joda.time.DateTimeZone;
import org.joda.time.DurationField;
import org.joda.time.DurationFieldType;
import org.joda.time.IllegalFieldValueException;
import org.joda.time.Instant;
import org.joda.time.Period;
import org.joda.time.TimeOfDay;
import org.joda.time.YearMonthDay;

/**
 * This class is a Junit unit test for GJChronology.
 *
 * @author Stephen Colebourne
 */
@SuppressWarnings("deprecation")
public class TestGJChronology extends TestCase {

    private static final DateTimeZone PARIS = DateTimeZone.forID("Europe/Paris");
    private static final DateTimeZone LONDON = DateTimeZone.forID("Europe/London");
    private static final DateTimeZone TOKYO = DateTimeZone.forID("Asia/Tokyo");

    long y2002days = 365 + 365 + 366 + 365 + 365 + 365 + 366 + 365 + 365 + 365 + 
                     366 + 365 + 365 + 365 + 366 + 365 + 365 + 365 + 366 + 365 + 
                     365 + 365 + 366 + 365 + 365 + 365 + 366 + 365 + 365 + 365 +
                     366 + 365;
    // 2002-06-09
    private long TEST_TIME_NOW =
            (y2002days + 31L + 28L + 31L + 30L + 31L + 9L -1L) * DateTimeConstants.MILLIS_PER_DAY;

    private DateTimeZone originalDateTimeZone = null;
    private TimeZone originalTimeZone = null;
    private Locale originalLocale = null;

    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }

    public static TestSuite suite() {
        return new TestSuite(TestGJChronology.class);
    }

    public TestGJChronology(String name) {
        super(name);
    }

    protected void setUp() throws Exception {
        DateTimeUtils.setCurrentMillisFixed(TEST_TIME_NOW);
        originalDateTimeZone = DateTimeZone.getDefault();
        originalTimeZone = TimeZone.getDefault();
        originalLocale = Locale.getDefault();
        DateTimeZone.setDefault(LONDON);
        TimeZone.setDefault(TimeZone.getTimeZone("Europe/London"));
        Locale.setDefault(Locale.UK);
    }

    protected void tearDown() throws Exception {
        DateTimeUtils.setCurrentMillisSystem();
        DateTimeZone.setDefault(originalDateTimeZone);
        TimeZone.setDefault(originalTimeZone);
        Locale.setDefault(originalLocale);
        originalDateTimeZone = null;
        originalTimeZone = null;
        originalLocale = null;
    }

    //-----------------------------------------------------------------------
    public void testFactoryUTC() {
        assertEquals(DateTimeZone.UTC, GJChronology.getInstanceUTC().getZone());
        assertSame(GJChronology.class, GJChronology.getInstanceUTC().getClass());
    }

    public void testFactory() {
        assertEquals(LONDON, GJChronology.getInstance().getZone());
        assertSame(GJChronology.class, GJChronology.getInstance().getClass());
    }

    public void testFactory_Zone() {
        assertEquals(TOKYO, GJChronology.getInstance(TOKYO).getZone());
        assertEquals(PARIS, GJChronology.getInstance(PARIS).getZone());
        assertEquals(LONDON, GJChronology.getInstance(null).getZone());
        assertSame(GJChronology.class, GJChronology.getInstance(TOKYO).getClass());
    }

    public void testFactory_Zone_long_int() {
        GJChronology chrono = GJChronology.getInstance(TOKYO, 0L, 2);
        assertEquals(TOKYO, chrono.getZone());
        assertEquals(new Instant(0L), chrono.getGregorianCutover());
        assertEquals(2, chrono.getMinimumDaysInFirstWeek());
        assertSame(GJChronology.class, GJChronology.getInstance(TOKYO, 0L, 2).getClass());
        
        try {
            GJChronology.getInstance(TOKYO, 0L, 0);
            fail();
        } catch (IllegalArgumentException ex) {}
        try {
            GJChronology.getInstance(TOKYO, 0L, 8);
            fail();
        } catch (IllegalArgumentException ex) {}
    }

    public void testFactory_Zone_RI() {
        GJChronology chrono = GJChronology.getInstance(TOKYO, new Instant(0L));
        assertEquals(TOKYO, chrono.getZone());
        assertEquals(new Instant(0L), chrono.getGregorianCutover());
        assertSame(GJChronology.class, GJChronology.getInstance(TOKYO, new Instant(0L)).getClass());
        
        DateTime cutover = new DateTime(1582, 10, 15, 0, 0, 0, 0, DateTimeZone.UTC);
        chrono = GJChronology.getInstance(TOKYO, null);
        assertEquals(TOKYO, chrono.getZone());
        assertEquals(cutover.toInstant(), chrono.getGregorianCutover());
    }

    public void testFactory_Zone_RI_int() {
        GJChronology chrono = GJChronology.getInstance(TOKYO, new Instant(0L), 2);
        assertEquals(TOKYO, chrono.getZone());
        assertEquals(new Instant(0L), chrono.getGregorianCutover());
        assertEquals(2, chrono.getMinimumDaysInFirstWeek());
        assertSame(GJChronology.class, GJChronology.getInstance(TOKYO, new Instant(0L), 2).getClass());
        
        DateTime cutover = new DateTime(1582, 10, 15, 0, 0, 0, 0, DateTimeZone.UTC);
        chrono = GJChronology.getInstance(TOKYO, null, 2);
        assertEquals(TOKYO, chrono.getZone());
        assertEquals(cutover.toInstant(), chrono.getGregorianCutover());
        assertEquals(2, chrono.getMinimumDaysInFirstWeek());
        
        try {
            GJChronology.getInstance(TOKYO, new Instant(0L), 0);
            fail();
        } catch (IllegalArgumentException ex) {}
        try {
            GJChronology.getInstance(TOKYO, new Instant(0L), 8);
            fail();
        } catch (IllegalArgumentException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testEquality() {
        assertSame(GJChronology.getInstance(TOKYO), GJChronology.getInstance(TOKYO));
        assertSame(GJChronology.getInstance(LONDON), GJChronology.getInstance(LONDON));
        assertSame(GJChronology.getInstance(PARIS), GJChronology.getInstance(PARIS));
        assertSame(GJChronology.getInstanceUTC(), GJChronology.getInstanceUTC());
        assertSame(GJChronology.getInstance(), GJChronology.getInstance(LONDON));
    }

    public void testWithUTC() {
        assertSame(GJChronology.getInstanceUTC(), GJChronology.getInstance(LONDON).withUTC());
        assertSame(GJChronology.getInstanceUTC(), GJChronology.getInstance(TOKYO).withUTC());
        assertSame(GJChronology.getInstanceUTC(), GJChronology.getInstanceUTC().withUTC());
        assertSame(GJChronology.getInstanceUTC(), GJChronology.getInstance().withUTC());
    }

    public void testWithZone() {
        assertSame(GJChronology.getInstance(TOKYO), GJChronology.getInstance(TOKYO).withZone(TOKYO));
        assertSame(GJChronology.getInstance(LONDON), GJChronology.getInstance(TOKYO).withZone(LONDON));
        assertSame(GJChronology.getInstance(PARIS), GJChronology.getInstance(TOKYO).withZone(PARIS));
        assertSame(GJChronology.getInstance(LONDON), GJChronology.getInstance(TOKYO).withZone(null));
        assertSame(GJChronology.getInstance(PARIS), GJChronology.getInstance().withZone(PARIS));
        assertSame(GJChronology.getInstance(PARIS), GJChronology.getInstanceUTC().withZone(PARIS));
    }

    public void testToString() {
        assertEquals("GJChronology[Europe/London]", GJChronology.getInstance(LONDON).toString());
        assertEquals("GJChronology[Asia/Tokyo]", GJChronology.getInstance(TOKYO).toString());
        assertEquals("GJChronology[Europe/London]", GJChronology.getInstance().toString());
        assertEquals("GJChronology[UTC]", GJChronology.getInstanceUTC().toString());
        assertEquals("GJChronology[UTC,cutover=1970-01-01]", GJChronology.getInstance(DateTimeZone.UTC, 0L, 4).toString());
        assertEquals("GJChronology[UTC,cutover=1970-01-01T00:00:00.001Z,mdfw=2]", GJChronology.getInstance(DateTimeZone.UTC, 1L, 2).toString());
    }

    //-----------------------------------------------------------------------
    public void testDurationFields() {
        final GJChronology gj = GJChronology.getInstance();
        assertEquals("eras", gj.eras().getName());
        assertEquals("centuries", gj.centuries().getName());
        assertEquals("years", gj.years().getName());
        assertEquals("weekyears", gj.weekyears().getName());
        assertEquals("months", gj.months().getName());
        assertEquals("weeks", gj.weeks().getName());
        assertEquals("halfdays", gj.halfdays().getName());
        assertEquals("days", gj.days().getName());
        assertEquals("hours", gj.hours().getName());
        assertEquals("minutes", gj.minutes().getName());
        assertEquals("seconds", gj.seconds().getName());
        assertEquals("millis", gj.millis().getName());
        
        assertEquals(false, gj.eras().isSupported());
        assertEquals(true, gj.centuries().isSupported());
        assertEquals(true, gj.years().isSupported());
        assertEquals(true, gj.weekyears().isSupported());
        assertEquals(true, gj.months().isSupported());
        assertEquals(true, gj.weeks().isSupported());
        assertEquals(true, gj.days().isSupported());
        assertEquals(true, gj.halfdays().isSupported());
        assertEquals(true, gj.hours().isSupported());
        assertEquals(true, gj.minutes().isSupported());
        assertEquals(true, gj.seconds().isSupported());
        assertEquals(true, gj.millis().isSupported());
        
        assertEquals(false, gj.centuries().isPrecise());
        assertEquals(false, gj.years().isPrecise());
        assertEquals(false, gj.weekyears().isPrecise());
        assertEquals(false, gj.months().isPrecise());
        assertEquals(false, gj.weeks().isPrecise());
        assertEquals(false, gj.days().isPrecise());
        assertEquals(false, gj.halfdays().isPrecise());
        assertEquals(true, gj.hours().isPrecise());
        assertEquals(true, gj.minutes().isPrecise());
        assertEquals(true, gj.seconds().isPrecise());
        assertEquals(true, gj.millis().isPrecise());
        
        final GJChronology gjUTC = GJChronology.getInstanceUTC();
        assertEquals(false, gjUTC.centuries().isPrecise());
        assertEquals(false, gjUTC.years().isPrecise());
        assertEquals(false, gjUTC.weekyears().isPrecise());
        assertEquals(false, gjUTC.months().isPrecise());
        assertEquals(true, gjUTC.weeks().isPrecise());
        assertEquals(true, gjUTC.days().isPrecise());
        assertEquals(true, gjUTC.halfdays().isPrecise());
        assertEquals(true, gjUTC.hours().isPrecise());
        assertEquals(true, gjUTC.minutes().isPrecise());
        assertEquals(true, gjUTC.seconds().isPrecise());
        assertEquals(true, gjUTC.millis().isPrecise());
        
        final DateTimeZone gmt = DateTimeZone.forID("Etc/GMT");
        final GJChronology gjGMT = GJChronology.getInstance(gmt);
        assertEquals(false, gjGMT.centuries().isPrecise());
        assertEquals(false, gjGMT.years().isPrecise());
        assertEquals(false, gjGMT.weekyears().isPrecise());
        assertEquals(false, gjGMT.months().isPrecise());
        assertEquals(true, gjGMT.weeks().isPrecise());
        assertEquals(true, gjGMT.days().isPrecise());
        assertEquals(true, gjGMT.halfdays().isPrecise());
        assertEquals(true, gjGMT.hours().isPrecise());
        assertEquals(true, gjGMT.minutes().isPrecise());
        assertEquals(true, gjGMT.seconds().isPrecise());
        assertEquals(true, gjGMT.millis().isPrecise());
    }

    public void testDateFields() {
        final GJChronology gj = GJChronology.getInstance();
        assertEquals("era", gj.era().getName());
        assertEquals("centuryOfEra", gj.centuryOfEra().getName());
        assertEquals("yearOfCentury", gj.yearOfCentury().getName());
        assertEquals("yearOfEra", gj.yearOfEra().getName());
        assertEquals("year", gj.year().getName());
        assertEquals("monthOfYear", gj.monthOfYear().getName());
        assertEquals("weekyearOfCentury", gj.weekyearOfCentury().getName());
        assertEquals("weekyear", gj.weekyear().getName());
        assertEquals("weekOfWeekyear", gj.weekOfWeekyear().getName());
        assertEquals("dayOfYear", gj.dayOfYear().getName());
        assertEquals("dayOfMonth", gj.dayOfMonth().getName());
        assertEquals("dayOfWeek", gj.dayOfWeek().getName());
        
        assertEquals(true, gj.era().isSupported());
        assertEquals(true, gj.centuryOfEra().isSupported());
        assertEquals(true, gj.yearOfCentury().isSupported());
        assertEquals(true, gj.yearOfEra().isSupported());
        assertEquals(true, gj.year().isSupported());
        assertEquals(true, gj.monthOfYear().isSupported());
        assertEquals(true, gj.weekyearOfCentury().isSupported());
        assertEquals(true, gj.weekyear().isSupported());
        assertEquals(true, gj.weekOfWeekyear().isSupported());
        assertEquals(true, gj.dayOfYear().isSupported());
        assertEquals(true, gj.dayOfMonth().isSupported());
        assertEquals(true, gj.dayOfWeek().isSupported());
        
        assertEquals(gj.eras(), gj.era().getDurationField());
        assertEquals(gj.centuries(), gj.centuryOfEra().getDurationField());
        assertEquals(gj.years(), gj.yearOfCentury().getDurationField());
        assertEquals(gj.years(), gj.yearOfEra().getDurationField());
        assertEquals(gj.years(), gj.year().getDurationField());
        assertEquals(gj.months(), gj.monthOfYear().getDurationField());
        assertEquals(gj.weekyears(), gj.weekyearOfCentury().getDurationField());
        assertEquals(gj.weekyears(), gj.weekyear().getDurationField());
        assertEquals(gj.weeks(), gj.weekOfWeekyear().getDurationField());
        assertEquals(gj.days(), gj.dayOfYear().getDurationField());
        assertEquals(gj.days(), gj.dayOfMonth().getDurationField());
        assertEquals(gj.days(), gj.dayOfWeek().getDurationField());
        
        assertEquals(null, gj.era().getRangeDurationField());
        assertEquals(gj.eras(), gj.centuryOfEra().getRangeDurationField());
        assertEquals(gj.centuries(), gj.yearOfCentury().getRangeDurationField());
        assertEquals(gj.eras(), gj.yearOfEra().getRangeDurationField());
        assertEquals(null, gj.year().getRangeDurationField());
        assertEquals(gj.years(), gj.monthOfYear().getRangeDurationField());
        assertEquals(gj.centuries(), gj.weekyearOfCentury().getRangeDurationField());
        assertEquals(null, gj.weekyear().getRangeDurationField());
        assertEquals(gj.weekyears(), gj.weekOfWeekyear().getRangeDurationField());
        assertEquals(gj.years(), gj.dayOfYear().getRangeDurationField());
        assertEquals(gj.months(), gj.dayOfMonth().getRangeDurationField());
        assertEquals(gj.weeks(), gj.dayOfWeek().getRangeDurationField());
    }

    public void testTimeFields() {
        final GJChronology gj = GJChronology.getInstance();
        assertEquals("halfdayOfDay", gj.halfdayOfDay().getName());
        assertEquals("clockhourOfHalfday", gj.clockhourOfHalfday().getName());
        assertEquals("hourOfHalfday", gj.hourOfHalfday().getName());
        assertEquals("clockhourOfDay", gj.clockhourOfDay().getName());
        assertEquals("hourOfDay", gj.hourOfDay().getName());
        assertEquals("minuteOfDay", gj.minuteOfDay().getName());
        assertEquals("minuteOfHour", gj.minuteOfHour().getName());
        assertEquals("secondOfDay", gj.secondOfDay().getName());
        assertEquals("secondOfMinute", gj.secondOfMinute().getName());
        assertEquals("millisOfDay", gj.millisOfDay().getName());
        assertEquals("millisOfSecond", gj.millisOfSecond().getName());
        
        assertEquals(true, gj.halfdayOfDay().isSupported());
        assertEquals(true, gj.clockhourOfHalfday().isSupported());
        assertEquals(true, gj.hourOfHalfday().isSupported());
        assertEquals(true, gj.clockhourOfDay().isSupported());
        assertEquals(true, gj.hourOfDay().isSupported());
        assertEquals(true, gj.minuteOfDay().isSupported());
        assertEquals(true, gj.minuteOfHour().isSupported());
        assertEquals(true, gj.secondOfDay().isSupported());
        assertEquals(true, gj.secondOfMinute().isSupported());
        assertEquals(true, gj.millisOfDay().isSupported());
        assertEquals(true, gj.millisOfSecond().isSupported());
    }

    public void testIllegalDates() {
        try {
            new DateTime(1582, 10, 5, 0, 0, 0, 0, GJChronology.getInstance(DateTimeZone.UTC));
            fail("Constructed illegal date");
        } catch (IllegalArgumentException e) { /* good */ }

        try {
            new DateTime(1582, 10, 14, 0, 0, 0, 0, GJChronology.getInstance(DateTimeZone.UTC));
            fail("Constructed illegal date");
        } catch (IllegalArgumentException e) { /* good */ }
    }

    public void testParseEquivalence() {
        testParse("1581-01-01T01:23:45.678", 1581, 1, 1, 1, 23, 45, 678);
        testParse("1581-06-30", 1581, 6, 30, 0, 0, 0, 0);
        testParse("1582-01-01T01:23:45.678", 1582, 1, 1, 1, 23, 45, 678);
        testParse("1582-06-30T01:23:45.678", 1582, 6, 30, 1, 23, 45, 678);
        testParse("1582-10-04", 1582, 10, 4, 0, 0, 0, 0);
        testParse("1582-10-15", 1582, 10, 15, 0, 0, 0, 0);
        testParse("1582-12-31", 1582, 12, 31, 0, 0, 0, 0);
        testParse("1583-12-31", 1583, 12, 31, 0, 0, 0, 0);
    }

    private void testParse(String str,
                           int year, int month, int day,
                           int hour, int minute, int second, int millis) {
        assertEquals(new DateTime(str, GJChronology.getInstance(DateTimeZone.UTC)),
                     new DateTime(year, month, day, hour, minute, second, millis,
                                  GJChronology.getInstance(DateTimeZone.UTC)));
    }

    public void testCutoverAddYears() {
        testAdd("1582-01-01", DurationFieldType.years(), 1, "1583-01-01");
        testAdd("1582-02-15", DurationFieldType.years(), 1, "1583-02-15");
        testAdd("1582-02-28", DurationFieldType.years(), 1, "1583-02-28");
        testAdd("1582-03-01", DurationFieldType.years(), 1, "1583-03-01");
        testAdd("1582-09-30", DurationFieldType.years(), 1, "1583-09-30");
        testAdd("1582-10-01", DurationFieldType.years(), 1, "1583-10-01");
        testAdd("1582-10-04", DurationFieldType.years(), 1, "1583-10-04");
        testAdd("1582-10-15", DurationFieldType.years(), 1, "1583-10-15");
        testAdd("1582-10-16", DurationFieldType.years(), 1, "1583-10-16");

        // Leap years...
        testAdd("1580-01-01", DurationFieldType.years(), 4, "1584-01-01");
        testAdd("1580-02-29", DurationFieldType.years(), 4, "1584-02-29");
        testAdd("1580-10-01", DurationFieldType.years(), 4, "1584-10-01");
        testAdd("1580-10-10", DurationFieldType.years(), 4, "1584-10-10");
        testAdd("1580-10-15", DurationFieldType.years(), 4, "1584-10-15");
        testAdd("1580-12-31", DurationFieldType.years(), 4, "1584-12-31");
    }

    public void testCutoverAddWeekyears() {
        testAdd("1582-W01-1", DurationFieldType.weekyears(), 1, "1583-W01-1");
        testAdd("1582-W39-1", DurationFieldType.weekyears(), 1, "1583-W39-1");
        testAdd("1583-W45-1", DurationFieldType.weekyears(), 1, "1584-W45-1");

        // This test fails, but I'm not sure if its worth fixing. The date
        // falls after the cutover, but in the cutover year. The add operation
        // is performed completely within the gregorian calendar, with no
        // crossing of the cutover. As a result, no special correction is
        // applied. Since the full gregorian year of 1582 has a different week
        // numbers than the full julian year of 1582, the week number is off by
        // one after the addition.
        //
        //testAdd("1582-W42-1", DurationFieldType.weekyears(), 1, "1583-W42-1");

        // Leap years...
        testAdd("1580-W01-1", DurationFieldType.weekyears(), 4, "1584-W01-1");
        testAdd("1580-W30-7", DurationFieldType.weekyears(), 4, "1584-W30-7");
        testAdd("1580-W50-7", DurationFieldType.weekyears(), 4, "1584-W50-7");
    }

    public void testCutoverAddMonths() {
        testAdd("1582-01-01", DurationFieldType.months(), 1, "1582-02-01");
        testAdd("1582-01-01", DurationFieldType.months(), 6, "1582-07-01");
        testAdd("1582-01-01", DurationFieldType.months(), 12, "1583-01-01");
        testAdd("1582-11-15", DurationFieldType.months(), 1, "1582-12-15");

        testAdd("1582-09-04", DurationFieldType.months(), 2, "1582-11-04");
        testAdd("1582-09-05", DurationFieldType.months(), 2, "1582-11-05");
        testAdd("1582-09-10", DurationFieldType.months(), 2, "1582-11-10");
        testAdd("1582-09-15", DurationFieldType.months(), 2, "1582-11-15");


        // Leap years...
        testAdd("1580-01-01", DurationFieldType.months(), 48, "1584-01-01");
        testAdd("1580-02-29", DurationFieldType.months(), 48, "1584-02-29");
        testAdd("1580-10-01", DurationFieldType.months(), 48, "1584-10-01");
        testAdd("1580-10-10", DurationFieldType.months(), 48, "1584-10-10");
        testAdd("1580-10-15", DurationFieldType.months(), 48, "1584-10-15");
        testAdd("1580-12-31", DurationFieldType.months(), 48, "1584-12-31");
    }

    public void testCutoverAddWeeks() {
        testAdd("1582-01-01", DurationFieldType.weeks(), 1, "1582-01-08");
        testAdd("1583-01-01", DurationFieldType.weeks(), 1, "1583-01-08");

        // Weeks are precise, and so cutover is not ignored.
        testAdd("1582-10-01", DurationFieldType.weeks(), 2, "1582-10-25");
        testAdd("1582-W01-1", DurationFieldType.weeks(), 51, "1583-W01-1");
    }

    public void testCutoverAddDays() {
        testAdd("1582-10-03", DurationFieldType.days(), 1, "1582-10-04");
        testAdd("1582-10-04", DurationFieldType.days(), 1, "1582-10-15");
        testAdd("1582-10-15", DurationFieldType.days(), 1, "1582-10-16");

        testAdd("1582-09-30", DurationFieldType.days(), 10, "1582-10-20");
        testAdd("1582-10-04", DurationFieldType.days(), 10, "1582-10-24");
        testAdd("1582-10-15", DurationFieldType.days(), 10, "1582-10-25");
    }

    public void testYearEndAddDays() {
        testAdd("1582-11-05", DurationFieldType.days(), 28, "1582-12-03");
        testAdd("1582-12-05", DurationFieldType.days(), 28, "1583-01-02");
        
        testAdd("2005-11-05", DurationFieldType.days(), 28, "2005-12-03");
        testAdd("2005-12-05", DurationFieldType.days(), 28, "2006-01-02");
    }

    public void testSubtractDays() {
        // This is a test for a bug in version 1.0. The dayOfMonth range
        // duration field did not match the monthOfYear duration field. This
        // caused an exception to be thrown when subtracting days.
        DateTime dt = new DateTime
            (1112306400000L, GJChronology.getInstance(DateTimeZone.forID("Europe/Berlin")));
        YearMonthDay ymd = dt.toYearMonthDay();
        while (ymd.toDateTimeAtMidnight().getDayOfWeek() != DateTimeConstants.MONDAY) { 
            ymd = ymd.minus(Period.days(1));
        }
    }

    private void testAdd(String start, DurationFieldType type, int amt, String end) {
        DateTime dtStart = new DateTime(start, GJChronology.getInstance(DateTimeZone.UTC));
        DateTime dtEnd = new DateTime(end, GJChronology.getInstance(DateTimeZone.UTC));
        assertEquals(dtEnd, dtStart.withFieldAdded(type, amt));
        assertEquals(dtStart, dtEnd.withFieldAdded(type, -amt));

        DurationField field = type.getField(GJChronology.getInstance(DateTimeZone.UTC));
        int diff = field.getDifference(dtEnd.getMillis(), dtStart.getMillis());
        assertEquals(amt, diff);
        
        if (type == DurationFieldType.years() ||
            type == DurationFieldType.months() ||
            type == DurationFieldType.days()) {
            YearMonthDay ymdStart = new YearMonthDay(start, GJChronology.getInstance(DateTimeZone.UTC));
            YearMonthDay ymdEnd = new YearMonthDay(end, GJChronology.getInstance(DateTimeZone.UTC));
            assertEquals(ymdEnd, ymdStart.withFieldAdded(type, amt));
            assertEquals(ymdStart, ymdEnd.withFieldAdded(type, -amt));
        }
    }

    public void testTimeOfDayAdd() {
        TimeOfDay start = new TimeOfDay(12, 30, GJChronology.getInstance());
        TimeOfDay end = new TimeOfDay(10, 30, GJChronology.getInstance());
        assertEquals(end, start.plusHours(22));
        assertEquals(start, end.minusHours(22));
        assertEquals(end, start.plusMinutes(22 * 60));
        assertEquals(start, end.minusMinutes(22 * 60));
    }

    public void testMaximumValue() {
        DateMidnight dt = new DateMidnight(1570, 1, 1, GJChronology.getInstance());
        while (dt.getYear() < 1590) {
            dt = dt.plusDays(1);
            YearMonthDay ymd = dt.toYearMonthDay();
            assertEquals(dt.year().getMaximumValue(), ymd.year().getMaximumValue());
            assertEquals(dt.monthOfYear().getMaximumValue(), ymd.monthOfYear().getMaximumValue());
            assertEquals(dt.dayOfMonth().getMaximumValue(), ymd.dayOfMonth().getMaximumValue());
        }
    }

    public void testPartialGetAsText() {
        GJChronology chrono = GJChronology.getInstance(TOKYO);
        assertEquals("January", new YearMonthDay("2005-01-01", chrono).monthOfYear().getAsText());
        assertEquals("Jan", new YearMonthDay("2005-01-01", chrono).monthOfYear().getAsShortText());
    }

    public void testLeapYearRulesConstruction() {
        // 1500 not leap in Gregorian, but is leap in Julian
        DateMidnight dt = new DateMidnight(1500, 2, 29, GJChronology.getInstanceUTC());
        assertEquals(dt.getYear(), 1500);
        assertEquals(dt.getMonthOfYear(), 2);
        assertEquals(dt.getDayOfMonth(), 29);
    }

    public void testLeapYearRulesConstructionInvalid() {
        // 1500 not leap in Gregorian, but is leap in Julian
        try {
            new DateMidnight(1500, 2, 30, GJChronology.getInstanceUTC());
            fail();
        } catch (IllegalFieldValueException ex) {
            // good
        }
    }

    public void testLeap_28feb() {
        Chronology chrono = GJChronology.getInstance();
        DateTime dt = new DateTime(2012, 2, 28, 0, 0, chrono);
        assertEquals(true, dt.year().isLeap());
        assertEquals(true, dt.monthOfYear().isLeap());
        assertEquals(false, dt.dayOfMonth().isLeap());
        assertEquals(false, dt.dayOfYear().isLeap());
    }

    public void testLeap_29feb() {
        Chronology chrono = GJChronology.getInstance();
        DateTime dt = new DateTime(2012, 2, 29, 0, 0, chrono);
        assertEquals(true, dt.year().isLeap());
        assertEquals(true, dt.monthOfYear().isLeap());
        assertEquals(true, dt.dayOfMonth().isLeap());
        assertEquals(true, dt.dayOfYear().isLeap());
    }

}

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