package org.apache.maven.it;
   
   import java.io.File;
   import java.util.ArrayList;
   import java.util.Arrays;
   import java.util.LinkedHashSet;
   import java.util.List;
   import java.util.Set;
   
  import org.apache.maven.it.util.ResourceExtractor;
  
  /**
   * Test set for <a href="https://issues.apache.org/jira/browse/MNG-5965">MNG-5965</a>.
   */
  public class MavenITmng5965ParallelBuildMultipliesWorkTest
      extends AbstractMavenIntegrationTestCase
  {
      public MavenITmng5965ParallelBuildMultipliesWorkTest()
      {
          super( "[3.6.1,)" );
      }
  
      public void testItShouldOnlyRunEachTaskOnce()
          throws Exception
      {
          File testDir =
              ResourceExtractor.simpleExtractResources( getClass(), "/mng-5965-parallel-build-multiplies-work" );
  
          Verifier verifier = newVerifier( testDir.getAbsolutePath(), false );
          verifier.setMavenDebug( false );
          verifier.setAutoclean( false );
  
          verifier.setLogFileName( "log-only.txt" );
          verifier.addCliOption( "-T1" );
          // include an aggregator task so that the two goals end up in different task segments
          verifier.executeGoals( Arrays.asList( "clean", "install:help" ) );
          verifier.verifyErrorFreeLog();
          verifier.resetStreams();
  
          List<String> logLines = verifier.loadLines( "log-only.txt", "UTF-8" );
  
          List<String> cleanGoalsExecuted = findCleanExecutions( logLines );
  
          // clean only executed once per module
          assertNoRepeatedLines( cleanGoalsExecuted );
  
          // clean executed in the 3 modules
          assertEquals( cleanGoalsExecuted.size(), 3 );
      }
  
      private void assertNoRepeatedLines( List<String> logLines )
          throws VerificationException
      {
          Set<String> uniqueLines = new LinkedHashSet<>();
          for ( String line : logLines )
          {
              if ( uniqueLines.contains( line ) )
              {
                  throw new VerificationException( "Goal executed twice: " + line );
              }
              uniqueLines.add( line );
          }
      }
  
      private List<String> findCleanExecutions( List<String> fullLog )
      {
          List<String> cleanExecutions = new ArrayList<>();
          for ( String line : fullLog )
          {
              if ( line.contains( "(default-clean)" ) )
              {
                  cleanExecutions.add( line );
              }
          }
  
          return cleanExecutions;
      }
  
  }