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    * distributed with this work for additional information
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    * 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
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   * under the License.
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  package org.apache.maven.scm.tck.command.changelog;
  
  import java.util.Collections;
  import java.util.Date;
  import java.util.List;
  
  import org.apache.maven.scm.ChangeSet;
  import org.apache.maven.scm.ScmBranch;
  import org.apache.maven.scm.ScmFileSet;
  import org.apache.maven.scm.ScmTagParameters;
  import org.apache.maven.scm.ScmTckTestCase;
  import org.apache.maven.scm.ScmTestCase;
  import org.apache.maven.scm.command.changelog.ChangeLogScmRequest;
  import org.apache.maven.scm.command.changelog.ChangeLogScmResult;
  import org.apache.maven.scm.command.checkin.CheckInScmResult;
  import org.apache.maven.scm.command.tag.TagScmResult;
  import org.apache.maven.scm.provider.ScmProvider;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  /**
   * Test Changlog command. <br>
   * 1. Get initial log <br>
   * 2. Add one revision <br>
   * 3. Get the two logs <br>
   * 4. Get the last log based on date <br>
   * 5. Test last log for date and comment <br>
   *
   * @author <a href="mailto:torbjorn@smorgrav.org">Torbj�rn Eikli Sm�rgrav</a>
   */
  public abstract class ChangeLogCommandTckTest extends ScmTckTestCase {
      private static final String COMMIT_MSG = "Second changelog";
      private static final String COMMIT_TAG = "v3.14";
  
      /**
       * In some SCMs (Hg) adding a tag creates an extra commit which offsets the expectations.
       * @return If an extra commit will be present for a tag.
       */
      public boolean isTagAnExtraCommit() {
          return false;
      }
  
      @Test
      public void testChangeLogCommand() throws Exception {
          Thread.sleep(1000);
          ScmProvider provider = getScmManager().getProviderByRepository(getScmRepository());
          ScmFileSet fileSet = new ScmFileSet(getWorkingCopy());
  
          ChangeLogScmResult firstResult =
                  provider.changeLog(getScmRepository(), fileSet, null, null, 0, (ScmBranch) null, null);
          assertTrue(
                  firstResult.getProviderMessage() + ": " + firstResult.getCommandLine() + "\n"
                          + firstResult.getCommandOutput(),
                  firstResult.isSuccess());
  
          // for svn and git the repo get recreated for each test and therefore initial changelog size is 1
          int firstLogSize = firstResult.getChangeLog().getChangeSets().size();
          assertTrue("Unexpected initial log size", firstLogSize >= 1);
  
          // Make a timestamp that we know are after initial revision but before the second
          Date timeBeforeSecond = new Date(); // Current time
  
          // pause a couple seconds... [SCM-244]
          Thread.sleep(2000);
  
          // Make a change to the readme.txt and commit the change
          this.edit(getWorkingCopy(), "readme.txt", null, getScmRepository());
          ScmTestCase.makeFile(getWorkingCopy(), "/readme.txt", "changed readme.txt");
          CheckInScmResult checkInResult = provider.checkIn(getScmRepository(), fileSet, COMMIT_MSG);
          assertTrue("Unable to checkin changes to the repository", checkInResult.isSuccess());
  
          ScmTagParameters scmTagParameters = new ScmTagParameters();
          TagScmResult tagResult = provider.tag(getScmRepository(), fileSet, COMMIT_TAG, scmTagParameters);
          assertTrue("Unable to tag the changes in the repository", tagResult.isSuccess());
  
          ChangeLogScmRequest changeLogScmRequest = new ChangeLogScmRequest(getScmRepository(), fileSet);
          ChangeLogScmResult secondResult = provider.changeLog(changeLogScmRequest);
          assertTrue(secondResult.getProviderMessage(), secondResult.isSuccess());
  
         List<ChangeSet> changeSets = secondResult.getChangeLog().getChangeSets();
 
         int expectedChangeSets = firstLogSize + 1;
         boolean lastCommitIsCausedByTagging = false;
         int lastCodeCommitIndex = 0;
 
         if (isTagAnExtraCommit()) {
             // This is for example Mercurial which creates an extra commit after tagging.
             lastCommitIsCausedByTagging = true;
             expectedChangeSets += 1;
             lastCodeCommitIndex = 1;
         }
 
         assertEquals(expectedChangeSets, changeSets.size());
 
         // Check if the tag has been retrieved again
         ChangeSet changeSetWithTag = changeSets.get(lastCodeCommitIndex);
         assertEquals(Collections.singletonList(COMMIT_TAG), changeSetWithTag.getTags());
 
         // Now only retrieve the changelog after timeBeforeSecondChangeLog
         Date currentTime = new Date();
         changeLogScmRequest = new ChangeLogScmRequest(getScmRepository(), fileSet);
         changeLogScmRequest.setStartDate(timeBeforeSecond);
         changeLogScmRequest.setEndDate(currentTime);
         changeLogScmRequest.setScmBranch(new ScmBranch(""));
         ChangeLogScmResult thirdResult = provider.changeLog(changeLogScmRequest);
 
         // Thorough assert of the last result
         assertTrue(thirdResult.getProviderMessage(), thirdResult.isSuccess());
 
         List<ChangeSet> thirdChangeSets = thirdResult.getChangeLog().getChangeSets();
         assertEquals(lastCommitIsCausedByTagging ? 2 : 1, thirdChangeSets.size());
         ChangeSet changeset = thirdChangeSets.get(lastCodeCommitIndex);
         assertTrue(changeset.getDate().after(timeBeforeSecond));
         assertTrue(changeset.getComment().startsWith(COMMIT_MSG));
     }
 }