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    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.http.client.utils;
  
  import java.util.Calendar;
  import java.util.Date;
  
  import org.junit.Assert;
  import org.junit.Test;
  
  /**
   * Unit tests for {@link DateUtils}.
   */
  public class TestDateUtils {
  
      @Test
      public void testBasicDateParse() throws Exception {
          final Calendar calendar = Calendar.getInstance();
          calendar.setTimeZone(DateUtils.GMT);
          calendar.set(2005, Calendar.OCTOBER, 14, 0, 0, 0);
          calendar.set(Calendar.MILLISECOND, 0);
          final Date date1 = calendar.getTime();
  
          final String[] formats = new String[] {
                  DateUtils.PATTERN_RFC1123
                  };
          Date date2 = DateUtils.parseDate("Fri, 14 Oct 2005 00:00:00 GMT", formats, null);
          Assert.assertEquals(date1, date2);
          date2 = DateUtils.parseDate("Fri, 14 Oct 2005 00:00:00 GMT", formats);
          Assert.assertEquals(date1, date2);
          date2 = DateUtils.parseDate("Fri, 14 Oct 2005 00:00:00 GMT");
          Assert.assertEquals(date1, date2);
      }
  
      @Test
      public void testMalformedDate() {
          Assert.assertNull(DateUtils.parseDate("Fri, 14 Oct 2005 00:00:00 GMT", new String[] {}, null));
      }
  
      @Test
      public void testInvalidInput() throws Exception {
          try {
              DateUtils.parseDate(null, null, null);
              Assert.fail("IllegalArgumentException should habe been thrown");
          } catch (final IllegalArgumentException ex) {
              // expected
          }
          try {
              DateUtils.formatDate(null);
              Assert.fail("IllegalArgumentException should habe been thrown");
          } catch (final IllegalArgumentException ex) {
              // expected
          }
          try {
              DateUtils.formatDate(new Date(), null);
              Assert.fail("IllegalArgumentException should habe been thrown");
          } catch (final IllegalArgumentException ex) {
              // expected
          }
      }
  
      @Test
      public void testTwoDigitYearDateParse() throws Exception {
          final Calendar calendar = Calendar.getInstance();
          calendar.setTimeZone(DateUtils.GMT);
          calendar.set(2005, Calendar.OCTOBER, 14, 0, 0, 0);
          calendar.set(Calendar.MILLISECOND, 0);
          Date date1 = calendar.getTime();
  
          final String[] formats = new String[] {
                  DateUtils.PATTERN_RFC1036
                  };
          Date date2 = DateUtils.parseDate("Friday, 14-Oct-05 00:00:00 GMT", formats, null);
          Assert.assertEquals(date1, date2);
 
         calendar.set(1900, Calendar.JANUARY, 0, 0, 0, 0);
         calendar.set(Calendar.MILLISECOND, 0);
         final Date startDate = calendar.getTime();
 
         calendar.set(1905, Calendar.OCTOBER, 14, 0, 0, 0);
         calendar.set(Calendar.MILLISECOND, 0);
         date1 = calendar.getTime();
 
         date2 = DateUtils.parseDate("Friday, 14-Oct-05 00:00:00 GMT", formats, startDate);
         Assert.assertEquals(date1, date2);
     }
 
     @Test
     public void testParseQuotedDate() throws Exception {
         final Calendar calendar = Calendar.getInstance();
         calendar.setTimeZone(DateUtils.GMT);
         calendar.set(2005, Calendar.OCTOBER, 14, 0, 0, 0);
         calendar.set(Calendar.MILLISECOND, 0);
         final Date date1 = calendar.getTime();
 
         final String[] formats = new String[] {
                 DateUtils.PATTERN_RFC1123
                 };
         final Date date2 = DateUtils.parseDate("'Fri, 14 Oct 2005 00:00:00 GMT'", formats);
         Assert.assertEquals(date1, date2);
     }
 
     @Test
     public void testBasicDateFormat() throws Exception {
         final Calendar calendar = Calendar.getInstance();
         calendar.setTimeZone(DateUtils.GMT);
         calendar.set(2005, Calendar.OCTOBER, 14, 0, 0, 0);
         calendar.set(Calendar.MILLISECOND, 0);
         final Date date = calendar.getTime();
 
         Assert.assertEquals("Fri, 14 Oct 2005 00:00:00 GMT", DateUtils.formatDate(date));
         Assert.assertEquals("Fri, 14 Oct 2005 00:00:00 GMT", DateUtils.formatDate(date, DateUtils.PATTERN_RFC1123));
     }
 
 }