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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.
   */
  package org.apache.maven.plugin;
  
  import javax.inject.Inject;
  
  import java.util.List;
  
  import org.apache.maven.AbstractCoreMavenComponentTestCase;
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.artifact.repository.DefaultRepositoryRequest;
  import org.apache.maven.artifact.repository.RepositoryRequest;
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.model.Plugin;
  import org.apache.maven.plugin.descriptor.MojoDescriptor;
  import org.apache.maven.plugin.descriptor.PluginDescriptor;
  import org.apache.maven.project.MavenProject;
  import org.codehaus.plexus.classworlds.realm.ClassRealm;
  import org.codehaus.plexus.component.repository.ComponentDescriptor;
  import org.codehaus.plexus.testing.PlexusTest;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.fail;
  
  @PlexusTest
  public class PluginManagerTest extends AbstractCoreMavenComponentTestCase {
  
      @Inject
      private BuildPluginManager pluginManager;
  
      protected String getProjectsDirectory() {
          return "src/test/projects/plugin-manager";
      }
  
      @Test
      public void testPluginLoading() throws Exception {
          MavenSession session = createMavenSession(null);
          Plugin plugin = new Plugin();
          plugin.setGroupId("org.apache.maven.its.plugins");
          plugin.setArtifactId("maven-it-plugin");
          plugin.setVersion("0.1");
          PluginDescriptor pluginDescriptor = pluginManager.loadPlugin(
                  plugin, session.getCurrentProject().getRemotePluginRepositories(), session.getRepositorySession());
          assertNotNull(pluginDescriptor);
      }
  
      @Test
      public void testMojoDescriptorRetrieval() throws Exception {
          MavenSession session = createMavenSession(null);
          String goal = "it";
          Plugin plugin = new Plugin();
          plugin.setGroupId("org.apache.maven.its.plugins");
          plugin.setArtifactId("maven-it-plugin");
          plugin.setVersion("0.1");
  
          MojoDescriptor mojoDescriptor = pluginManager.getMojoDescriptor(
                  plugin,
                  goal,
                  session.getCurrentProject().getRemotePluginRepositories(),
                  session.getRepositorySession());
          assertNotNull(mojoDescriptor);
          assertEquals(goal, mojoDescriptor.getGoal());
          // igorf: plugin realm comes later
          // assertNotNull( mojoDescriptor.getRealm() );
  
          PluginDescriptor pluginDescriptor = mojoDescriptor.getPluginDescriptor();
          assertNotNull(pluginDescriptor);
          assertEquals("org.apache.maven.its.plugins", pluginDescriptor.getGroupId());
          assertEquals("maven-it-plugin", pluginDescriptor.getArtifactId());
          assertEquals("0.1", pluginDescriptor.getVersion());
      }
  
      // -----------------------------------------------------------------------------------------------
      // Tests which exercise the lifecycle executor when it is dealing with individual goals.
      // -----------------------------------------------------------------------------------------------
  
      // TODO These two tests display a lack of symmetry with respect to the input which is a free form string and the
      //      mojo descriptor which comes back. All the free form parsing needs to be done somewhere else, this is
      //      really the function of the CLI, and then the pre-processing of that output still needs to be fed into
      //      a hinting process which helps flesh out the full specification of the plugin. The plugin manager should
      //      only deal in concrete terms -- all version finding mumbo jumbo is a customization to base functionality
     //      the plugin manager provides.
 
     @Test
     public void testRemoteResourcesPlugin() throws Exception {
         // TODO turn an equivalent back on when the RR plugin is released.
 
         /*
 
         This will not work until the RR plugin is released to get rid of the binding to the reporting exception which is a mistake.
 
         This happens after removing the reporting API from the core:
 
         java.lang.NoClassDefFoundError: org/apache/maven/reporting/MavenReportException
 
         MavenSession session = createMavenSession( getProject( "project-with-inheritance" ) );
         String goal = "process";
 
         Plugin plugin = new Plugin();
         plugin.setGroupId( "org.apache.maven.plugins" );
         plugin.setArtifactId( "maven-remote-resources-plugin" );
         plugin.setVersion( "1.0-beta-2" );
 
         MojoDescriptor mojoDescriptor = pluginManager.getMojoDescriptor( plugin, goal, session.getCurrentProject(), session.getLocalRepository() );
         assertPluginDescriptor( mojoDescriptor, "org.apache.maven.plugins", "maven-remote-resources-plugin", "1.0-beta-2" );
         MojoExecution mojoExecution = new MojoExecution( mojoDescriptor );
         pluginManager.executeMojo( session, mojoExecution );
         */
     }
 
     // TODO this will be the basis of the customizable lifecycle execution so need to figure this out quickly.
     @Test
     public void testSurefirePlugin() throws Exception {
         /*
         MavenSession session = createMavenSession( getProject( "project-with-inheritance" ) );
         String goal = "test";
 
         Plugin plugin = new Plugin();
         plugin.setGroupId( "org.apache.maven.plugins" );
         plugin.setArtifactId( "maven-surefire-plugin" );
         plugin.setVersion( "2.4.2" );
 
         // The project has already been fully interpolated so getting the raw mojoDescriptor is not going to have the processes configuration.
         MojoDescriptor mojoDescriptor = pluginManager.getMojoDescriptor( plugin, goal, session.getLocalRepository(), session.getCurrentProject().getPluginArtifactRepositories() );
         assertPluginDescriptor( mojoDescriptor, "org.apache.maven.plugins", "maven-surefire-plugin", "2.4.2" );
 
         System.out.println( session.getCurrentProject().getBuild().getPluginsAsMap() );
 
         Xpp3Dom configuration = (Xpp3Dom) session.getCurrentProject().getBuild().getPluginsAsMap().get( plugin.getKey() ).getExecutions().get( 0 ).getConfiguration();
         MojoExecution mojoExecution = new MojoExecution( mojoDescriptor, configuration );
         pluginManager.executeMojo( session, mojoExecution );
         */
     }
 
     @Test
     public void testMojoConfigurationIsMergedCorrectly() throws Exception {}
 
     /**
      * The case where the user wants to specify an alternate version of the underlying tool. Common case
      * is in the Antlr plugin which comes bundled with a version of Antlr but the user often times needs
      * to use a specific version. We need to make sure the version that they specify takes precedence.
      */
     @Test
     public void testMojoWhereInternallyStatedDependencyIsOverriddenByProject() throws Exception {}
 
     /**
      * The case where you have a plugin in the current build that you want to be used on projects in
      * the current build.
      */
     @Test
     public void testMojoThatIsPresentInTheCurrentBuild() throws Exception {}
 
     /**
      * This is the case where the Mojo wants to execute on every project and then do something at the end
      * with the results of each project.
      */
     @Test
     public void testAggregatorMojo() throws Exception {}
 
     /**
      * This is the case where a Mojo needs the lifecycle run to a certain phase before it can do
      * anything useful.
      */
     @Test
     public void testMojoThatRequiresExecutionToAGivenPhaseBeforeExecutingItself() throws Exception {}
 
     // test that mojo which does not require dependency resolution trigger no downloading of dependencies
 
     // test interpolation of basedir values in mojo configuration
 
     // test a build where projects use different versions of the same plugin
 
     @Test
     public void testThatPluginDependencyThatHasSystemScopeIsResolved() throws Exception {
         MavenSession session = createMavenSession(getProject("project-contributing-system-scope-plugin-dep"));
         MavenProject project = session.getCurrentProject();
         Plugin plugin = project.getPlugin("org.apache.maven.its.plugins:maven-it-plugin");
 
         RepositoryRequest repositoryRequest = new DefaultRepositoryRequest();
         repositoryRequest.setLocalRepository(getLocalRepository());
         repositoryRequest.setRemoteRepositories(getPluginArtifactRepositories());
 
         PluginDescriptor pluginDescriptor = pluginManager.loadPlugin(
                 plugin, session.getCurrentProject().getRemotePluginRepositories(), session.getRepositorySession());
         pluginManager.getPluginRealm(session, pluginDescriptor);
         List<Artifact> artifacts = pluginDescriptor.getArtifacts();
 
         for (Artifact a : artifacts) {
             if (a.getGroupId().equals("org.apache.maven.its.mng3586")
                     && a.getArtifactId().equals("tools")) {
                 // The system scoped dependencies will be present in the classloader for the plugin
                 return;
             }
         }
 
         fail("Can't find the system scoped dependency in the plugin artifacts.");
     }
 
     // -----------------------------------------------------------------------------------------------
     // Testing help
     // -----------------------------------------------------------------------------------------------
 
     protected void assertPluginDescriptor(
             MojoDescriptor mojoDescriptor, String groupId, String artifactId, String version) {
         assertNotNull(mojoDescriptor);
         PluginDescriptor pd = mojoDescriptor.getPluginDescriptor();
         assertNotNull(pd);
         assertEquals(groupId, pd.getGroupId());
         assertEquals(artifactId, pd.getArtifactId());
         assertEquals(version, pd.getVersion());
     }
 
     @Test
     public void testPluginRealmCache() throws Exception {
         RepositoryRequest repositoryRequest = new DefaultRepositoryRequest();
         repositoryRequest.setLocalRepository(getLocalRepository());
         repositoryRequest.setRemoteRepositories(getPluginArtifactRepositories());
 
         // prime realm cache
         MavenSession session = createMavenSession(getProject("project-contributing-system-scope-plugin-dep"));
         MavenProject project = session.getCurrentProject();
         Plugin plugin = project.getPlugin("org.apache.maven.its.plugins:maven-it-plugin");
 
         PluginDescriptor pluginDescriptor = pluginManager.loadPlugin(
                 plugin, session.getCurrentProject().getRemotePluginRepositories(), session.getRepositorySession());
         pluginManager.getPluginRealm(session, pluginDescriptor);
 
         assertEquals(1, pluginDescriptor.getDependencies().size());
 
         for (ComponentDescriptor<?> descriptor : pluginDescriptor.getComponents()) {
             assertNotNull(descriptor.getRealm());
             assertNotNull(descriptor.getImplementationClass());
         }
 
         // reload plugin realm from cache
         session = createMavenSession(getProject("project-contributing-system-scope-plugin-dep"));
         project = session.getCurrentProject();
         plugin = project.getPlugin("org.apache.maven.its.plugins:maven-it-plugin");
 
         pluginDescriptor = pluginManager.loadPlugin(
                 plugin, session.getCurrentProject().getRemotePluginRepositories(), session.getRepositorySession());
         pluginManager.getPluginRealm(session, pluginDescriptor);
 
         assertEquals(1, pluginDescriptor.getDependencies().size());
 
         for (ComponentDescriptor<?> descriptor : pluginDescriptor.getComponents()) {
             assertNotNull(descriptor.getRealm());
             assertNotNull(descriptor.getImplementationClass());
         }
     }
 
     @Test
     public void testBuildExtensionsPluginLoading() throws Exception {
         RepositoryRequest repositoryRequest = new DefaultRepositoryRequest();
         repositoryRequest.setLocalRepository(getLocalRepository());
         repositoryRequest.setRemoteRepositories(getPluginArtifactRepositories());
 
         // prime realm cache
         MavenSession session = createMavenSession(getProject("project-with-build-extensions-plugin"));
         MavenProject project = session.getCurrentProject();
         Plugin plugin = project.getPlugin("org.apache.maven.its.plugins:maven-it-plugin");
 
         PluginDescriptor pluginDescriptor = pluginManager.loadPlugin(
                 plugin, session.getCurrentProject().getRemotePluginRepositories(), session.getRepositorySession());
         ClassRealm pluginRealm = pluginManager.getPluginRealm(session, pluginDescriptor);
 
         assertEquals(pluginRealm, pluginDescriptor.getComponents().get(0).getRealm());
     }
 }