gt:             type == DurationFieldType.months() ||
context: /*
   *  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.DateTimeFieldType;
  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.Partial;
  import org.joda.time.TimeOfDay;
  import org.joda.time.YearMonthDay;
  
  /**
   * This class is a Junit unit test for ISOChronology.
   *
   * @author Stephen Colebourne
   */
  @SuppressWarnings("deprecation")
  public class TestISOChronology 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(TestISOChronology.class);
      }
  
      public TestISOChronology(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, ISOChronology.getInstanceUTC().getZone());
          assertSame(ISOChronology.class, ISOChronology.getInstanceUTC().getClass());
      }
  
      public void testFactory() {
          assertEquals(LONDON, ISOChronology.getInstance().getZone());
          assertSame(ISOChronology.class, ISOChronology.getInstance().getClass());
      }
  
      public void testFactory_Zone() {
          assertEquals(TOKYO, ISOChronology.getInstance(TOKYO).getZone());
          assertEquals(PARIS, ISOChronology.getInstance(PARIS).getZone());
          assertEquals(LONDON, ISOChronology.getInstance(null).getZone());
          assertSame(ISOChronology.class, ISOChronology.getInstance(TOKYO).getClass());
      }
  
      //-----------------------------------------------------------------------
      public void testEquality() {
          assertSame(ISOChronology.getInstance(TOKYO), ISOChronology.getInstance(TOKYO));
          assertSame(ISOChronology.getInstance(LONDON), ISOChronology.getInstance(LONDON));
          assertSame(ISOChronology.getInstance(PARIS), ISOChronology.getInstance(PARIS));
          assertSame(ISOChronology.getInstanceUTC(), ISOChronology.getInstanceUTC());
          assertSame(ISOChronology.getInstance(), ISOChronology.getInstance(LONDON));
      }
  
      public void testWithUTC() {
          assertSame(ISOChronology.getInstanceUTC(), ISOChronology.getInstance(LONDON).withUTC());
          assertSame(ISOChronology.getInstanceUTC(), ISOChronology.getInstance(TOKYO).withUTC());
          assertSame(ISOChronology.getInstanceUTC(), ISOChronology.getInstanceUTC().withUTC());
          assertSame(ISOChronology.getInstanceUTC(), ISOChronology.getInstance().withUTC());
      }
  
      public void testWithZone() {
          assertSame(ISOChronology.getInstance(TOKYO), ISOChronology.getInstance(TOKYO).withZone(TOKYO));
          assertSame(ISOChronology.getInstance(LONDON), ISOChronology.getInstance(TOKYO).withZone(LONDON));
          assertSame(ISOChronology.getInstance(PARIS), ISOChronology.getInstance(TOKYO).withZone(PARIS));
          assertSame(ISOChronology.getInstance(LONDON), ISOChronology.getInstance(TOKYO).withZone(null));
          assertSame(ISOChronology.getInstance(PARIS), ISOChronology.getInstance().withZone(PARIS));
          assertSame(ISOChronology.getInstance(PARIS), ISOChronology.getInstanceUTC().withZone(PARIS));
      }
  
      public void testToString() {
          assertEquals("ISOChronology[Europe/London]", ISOChronology.getInstance(LONDON).toString());
          assertEquals("ISOChronology[Asia/Tokyo]", ISOChronology.getInstance(TOKYO).toString());
          assertEquals("ISOChronology[Europe/London]", ISOChronology.getInstance().toString());
          assertEquals("ISOChronology[UTC]", ISOChronology.getInstanceUTC().toString());
      }
  
      //-----------------------------------------------------------------------
      public void testDurationFields() {
          final ISOChronology iso = ISOChronology.getInstance();
          assertEquals("eras", iso.eras().getName());
          assertEquals("centuries", iso.centuries().getName());
          assertEquals("years", iso.years().getName());
          assertEquals("weekyears", iso.weekyears().getName());
          assertEquals("months", iso.months().getName());
          assertEquals("weeks", iso.weeks().getName());
          assertEquals("days", iso.days().getName());
          assertEquals("halfdays", iso.halfdays().getName());
          assertEquals("hours", iso.hours().getName());
          assertEquals("minutes", iso.minutes().getName());
          assertEquals("seconds", iso.seconds().getName());
          assertEquals("millis", iso.millis().getName());
          
          assertEquals(false, iso.eras().isSupported());
          assertEquals(true, iso.centuries().isSupported());
          assertEquals(true, iso.years().isSupported());
          assertEquals(true, iso.weekyears().isSupported());
          assertEquals(true, iso.months().isSupported());
          assertEquals(true, iso.weeks().isSupported());
          assertEquals(true, iso.days().isSupported());
          assertEquals(true, iso.halfdays().isSupported());
          assertEquals(true, iso.hours().isSupported());
          assertEquals(true, iso.minutes().isSupported());
          assertEquals(true, iso.seconds().isSupported());
          assertEquals(true, iso.millis().isSupported());
          
          assertEquals(false, iso.centuries().isPrecise());
          assertEquals(false, iso.years().isPrecise());
          assertEquals(false, iso.weekyears().isPrecise());
          assertEquals(false, iso.months().isPrecise());
          assertEquals(false, iso.weeks().isPrecise());
          assertEquals(false, iso.days().isPrecise());
          assertEquals(false, iso.halfdays().isPrecise());
          assertEquals(true, iso.hours().isPrecise());
          assertEquals(true, iso.minutes().isPrecise());
          assertEquals(true, iso.seconds().isPrecise());
          assertEquals(true, iso.millis().isPrecise());
          
          final ISOChronology isoUTC = ISOChronology.getInstanceUTC();
          assertEquals(false, isoUTC.centuries().isPrecise());
          assertEquals(false, isoUTC.years().isPrecise());
          assertEquals(false, isoUTC.weekyears().isPrecise());
          assertEquals(false, isoUTC.months().isPrecise());
          assertEquals(true, isoUTC.weeks().isPrecise());
          assertEquals(true, isoUTC.days().isPrecise());
          assertEquals(true, isoUTC.halfdays().isPrecise());
          assertEquals(true, isoUTC.hours().isPrecise());
          assertEquals(true, isoUTC.minutes().isPrecise());
          assertEquals(true, isoUTC.seconds().isPrecise());
          assertEquals(true, isoUTC.millis().isPrecise());
          
          final DateTimeZone gmt = DateTimeZone.forID("Etc/GMT");
          final ISOChronology isoGMT = ISOChronology.getInstance(gmt);
          assertEquals(false, isoGMT.centuries().isPrecise());
          assertEquals(false, isoGMT.years().isPrecise());
          assertEquals(false, isoGMT.weekyears().isPrecise());
          assertEquals(false, isoGMT.months().isPrecise());
          assertEquals(true, isoGMT.weeks().isPrecise());
          assertEquals(true, isoGMT.days().isPrecise());
          assertEquals(true, isoGMT.halfdays().isPrecise());
          assertEquals(true, isoGMT.hours().isPrecise());
          assertEquals(true, isoGMT.minutes().isPrecise());
          assertEquals(true, isoGMT.seconds().isPrecise());
          assertEquals(true, isoGMT.millis().isPrecise());
          
          final DateTimeZone offset = DateTimeZone.forOffsetHours(1);
          final ISOChronology isoOffset1 = ISOChronology.getInstance(offset);
          assertEquals(false, isoOffset1.centuries().isPrecise());
          assertEquals(false, isoOffset1.years().isPrecise());
          assertEquals(false, isoOffset1.weekyears().isPrecise());
          assertEquals(false, isoOffset1.months().isPrecise());
          assertEquals(true, isoOffset1.weeks().isPrecise());
          assertEquals(true, isoOffset1.days().isPrecise());
          assertEquals(true, isoOffset1.halfdays().isPrecise());
          assertEquals(true, isoOffset1.hours().isPrecise());
          assertEquals(true, isoOffset1.minutes().isPrecise());
          assertEquals(true, isoOffset1.seconds().isPrecise());
          assertEquals(true, isoOffset1.millis().isPrecise());
      }
  
      public void testDateFields() {
          final ISOChronology iso = ISOChronology.getInstance();
          assertEquals("era", iso.era().getName());
          assertEquals("centuryOfEra", iso.centuryOfEra().getName());
          assertEquals("yearOfCentury", iso.yearOfCentury().getName());
          assertEquals("yearOfEra", iso.yearOfEra().getName());
          assertEquals("year", iso.year().getName());
          assertEquals("monthOfYear", iso.monthOfYear().getName());
          assertEquals("weekyearOfCentury", iso.weekyearOfCentury().getName());
          assertEquals("weekyear", iso.weekyear().getName());
          assertEquals("weekOfWeekyear", iso.weekOfWeekyear().getName());
          assertEquals("dayOfYear", iso.dayOfYear().getName());
          assertEquals("dayOfMonth", iso.dayOfMonth().getName());
          assertEquals("dayOfWeek", iso.dayOfWeek().getName());
          
          assertEquals(true, iso.era().isSupported());
          assertEquals(true, iso.centuryOfEra().isSupported());
          assertEquals(true, iso.yearOfCentury().isSupported());
          assertEquals(true, iso.yearOfEra().isSupported());
          assertEquals(true, iso.year().isSupported());
          assertEquals(true, iso.monthOfYear().isSupported());
          assertEquals(true, iso.weekyearOfCentury().isSupported());
          assertEquals(true, iso.weekyear().isSupported());
          assertEquals(true, iso.weekOfWeekyear().isSupported());
          assertEquals(true, iso.dayOfYear().isSupported());
          assertEquals(true, iso.dayOfMonth().isSupported());
          assertEquals(true, iso.dayOfWeek().isSupported());
          
          assertEquals(iso.eras(), iso.era().getDurationField());
          assertEquals(iso.centuries(), iso.centuryOfEra().getDurationField());
          assertEquals(iso.years(), iso.yearOfCentury().getDurationField());
          assertEquals(iso.years(), iso.yearOfEra().getDurationField());
          assertEquals(iso.years(), iso.year().getDurationField());
          assertEquals(iso.months(), iso.monthOfYear().getDurationField());
          assertEquals(iso.weekyears(), iso.weekyearOfCentury().getDurationField());
          assertEquals(iso.weekyears(), iso.weekyear().getDurationField());
          assertEquals(iso.weeks(), iso.weekOfWeekyear().getDurationField());
          assertEquals(iso.days(), iso.dayOfYear().getDurationField());
          assertEquals(iso.days(), iso.dayOfMonth().getDurationField());
          assertEquals(iso.days(), iso.dayOfWeek().getDurationField());
          
          assertEquals(null, iso.era().getRangeDurationField());
          assertEquals(iso.eras(), iso.centuryOfEra().getRangeDurationField());
          assertEquals(iso.centuries(), iso.yearOfCentury().getRangeDurationField());
          assertEquals(iso.eras(), iso.yearOfEra().getRangeDurationField());
          assertEquals(null, iso.year().getRangeDurationField());
          assertEquals(iso.years(), iso.monthOfYear().getRangeDurationField());
          assertEquals(iso.centuries(), iso.weekyearOfCentury().getRangeDurationField());
          assertEquals(null, iso.weekyear().getRangeDurationField());
          assertEquals(iso.weekyears(), iso.weekOfWeekyear().getRangeDurationField());
          assertEquals(iso.years(), iso.dayOfYear().getRangeDurationField());
          assertEquals(iso.months(), iso.dayOfMonth().getRangeDurationField());
          assertEquals(iso.weeks(), iso.dayOfWeek().getRangeDurationField());
      }
  
      public void testTimeFields() {
          final ISOChronology iso = ISOChronology.getInstance();
          assertEquals("halfdayOfDay", iso.halfdayOfDay().getName());
          assertEquals("clockhourOfHalfday", iso.clockhourOfHalfday().getName());
          assertEquals("hourOfHalfday", iso.hourOfHalfday().getName());
          assertEquals("clockhourOfDay", iso.clockhourOfDay().getName());
          assertEquals("hourOfDay", iso.hourOfDay().getName());
          assertEquals("minuteOfDay", iso.minuteOfDay().getName());
          assertEquals("minuteOfHour", iso.minuteOfHour().getName());
          assertEquals("secondOfDay", iso.secondOfDay().getName());
          assertEquals("secondOfMinute", iso.secondOfMinute().getName());
          assertEquals("millisOfDay", iso.millisOfDay().getName());
          assertEquals("millisOfSecond", iso.millisOfSecond().getName());
          
          assertEquals(true, iso.halfdayOfDay().isSupported());
          assertEquals(true, iso.clockhourOfHalfday().isSupported());
          assertEquals(true, iso.hourOfHalfday().isSupported());
          assertEquals(true, iso.clockhourOfDay().isSupported());
          assertEquals(true, iso.hourOfDay().isSupported());
          assertEquals(true, iso.minuteOfDay().isSupported());
          assertEquals(true, iso.minuteOfHour().isSupported());
          assertEquals(true, iso.secondOfDay().isSupported());
          assertEquals(true, iso.secondOfMinute().isSupported());
          assertEquals(true, iso.millisOfDay().isSupported());
          assertEquals(true, iso.millisOfSecond().isSupported());
      }
  
      public void testMaxYear() {
          final ISOChronology chrono = ISOChronology.getInstanceUTC();
          final int maxYear = chrono.year().getMaximumValue();
  
          DateTime start = new DateTime(maxYear, 1, 1, 0, 0, 0, 0, chrono);
          DateTime end = new DateTime(maxYear, 12, 31, 23, 59, 59, 999, chrono);
          assertTrue(start.getMillis() > 0);
          assertTrue(end.getMillis() > start.getMillis());
          assertEquals(maxYear, start.getYear());
          assertEquals(maxYear, end.getYear());
          long delta = end.getMillis() - start.getMillis();
          long expectedDelta = 
              (start.year().isLeap() ? 366L : 365L) * DateTimeConstants.MILLIS_PER_DAY - 1;
          assertEquals(expectedDelta, delta);
  
          assertEquals(start, new DateTime(maxYear + "-01-01T00:00:00.000Z", chrono));
          assertEquals(end, new DateTime(maxYear + "-12-31T23:59:59.999Z", chrono));
  
          try {
              start.plusYears(1);
              fail();
          } catch (IllegalFieldValueException e) {
          }
  
          try {
              end.plusYears(1);
              fail();
          } catch (IllegalFieldValueException e) {
          }
  
          assertEquals(maxYear + 1, chrono.year().get(Long.MAX_VALUE));
      }
  
      public void testMinYear() {
          final ISOChronology chrono = ISOChronology.getInstanceUTC();
          final int minYear = chrono.year().getMinimumValue();
  
          DateTime start = new DateTime(minYear, 1, 1, 0, 0, 0, 0, chrono);
          DateTime end = new DateTime(minYear, 12, 31, 23, 59, 59, 999, chrono);
          assertTrue(start.getMillis() < 0);
          assertTrue(end.getMillis() > start.getMillis());
          assertEquals(minYear, start.getYear());
          assertEquals(minYear, end.getYear());
          long delta = end.getMillis() - start.getMillis();
          long expectedDelta = 
              (start.year().isLeap() ? 366L : 365L) * DateTimeConstants.MILLIS_PER_DAY - 1;
          assertEquals(expectedDelta, delta);
  
          assertEquals(start, new DateTime(minYear + "-01-01T00:00:00.000Z", chrono));
          assertEquals(end, new DateTime(minYear + "-12-31T23:59:59.999Z", chrono));
  
          try {
              start.minusYears(1);
              fail();
          } catch (IllegalFieldValueException e) {
          }
  
          try {
              end.minusYears(1);
              fail();
          } catch (IllegalFieldValueException e) {
          }
  
          assertEquals(minYear - 1, chrono.year().get(Long.MIN_VALUE));
      }
  
      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");
          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 testAddMonths() {
          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");
          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");
      }
  
      private void testAdd(String start, DurationFieldType type, int amt, String end) {
          DateTime dtStart = new DateTime(start, ISOChronology.getInstanceUTC());
          DateTime dtEnd = new DateTime(end, ISOChronology.getInstanceUTC());
          assertEquals(dtEnd, dtStart.withFieldAdded(type, amt));
          assertEquals(dtStart, dtEnd.withFieldAdded(type, -amt));
  
          DurationField field = type.getField(ISOChronology.getInstanceUTC());
          int diff = field.getDifference(dtEnd.getMillis(), dtStart.getMillis());
          assertEquals(amt, diff);
          
          if (type == DurationFieldType.years() ||
  