// ----------------------------------------------------------------------
    //
    // ----------------------------------------------------------------------

    public PluginDescriptor() {}

    public PluginDescriptor(PluginDescriptor original) {
        this.setGroupId(original.getGroupId());
        this.setArtifactId(original.getArtifactId());
        this.setVersion(original.getVersion());

        }
    }

    private PluginDescriptor build(String source, PlexusConfiguration c) throws PlexusConfigurationException {
        PluginDescriptor pluginDescriptor = new PluginDescriptor();

        pluginDescriptor.setSource(source);
        pluginDescriptor.setGroupId(extractGroupId(c));
        pluginDescriptor.setArtifactId(extractArtifactId(c));
        pluginDescriptor.setVersion(extractVersion(c));

        MojoDescriptor mojoDescriptor = new MojoDescriptor();
        mojoDescriptor.setGoal("goal");
        PluginDescriptor pluginDescriptor = new PluginDescriptor();
        pluginDescriptor.setGoalPrefix("goalPrefix");
        pluginDescriptor.setArtifactId("artifactId");
        mojoDescriptor.setPluginDescriptor(pluginDescriptor);

        Parameter parameter = new Parameter();
        parameter.setType("java.lang.String[]");

        // 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());
    }

        discoverPluginComponents(pluginRealm, plugin, pluginDescriptor);

        pluginDescriptor.setDependencyNode(result.getRoot());
        pluginDescriptor.setClassRealm(pluginRealm);
        pluginDescriptor.setArtifacts(pluginArtifacts);
    }

    private void discoverPluginComponents(
            final ClassRealm pluginRealm, Plugin plugin, PluginDescriptor pluginDescriptor)
            throws PluginContainerException {

import org.apache.maven.api.plugin.descriptor.PluginDescriptor;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;

/**
 * Verifies that subclasses from generated model classes are possible.
 */
class ExtendedPluginDescriptorTest {

    /**
     * A subclass of the generated class {@link PluginDescriptor} that adds an additional field.
     */

        MavenSession session = legacySupport.getSession();

        PluginDescriptor pluginDescriptor;
        try {
            pluginDescriptor = pluginManager.getPluginDescriptor(
                    plugin, session.getCurrentProject().getRemotePluginRepositories(), session.getRepositorySession());

            pluginManager.setupPluginRealm(pluginDescriptor, session, null, null, null);
        } catch (Exception e) {

import org.apache.maven.plugin.descriptor.PluginDescriptor;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.eclipse.aether.RepositorySystemSession;
import org.eclipse.aether.repository.RemoteRepository;

/**
 */
public class BuildPluginManagerStub implements BuildPluginManager {

    @Override
    public PluginDescriptor loadPlugin(

            }
        }
        return clone(desc);
    }

    @Override
    public void put(Key cacheKey, PluginDescriptor pluginDescriptor) {
        descriptors.put(cacheKey, clone(pluginDescriptor));
    }

    protected static PluginDescriptor clone(PluginDescriptor original) {
        return new PluginDescriptor(original);
    }

    private static final class CacheKey implements Key {

                "maven-it-plugin",
                "0.1",
                "compile",
                "jar",
                null,
                new DefaultArtifactHandler("ignore"));
        PluginDescriptor descriptor = new PluginDescriptor();
        descriptor.setGroupId("org.apache.maven.its.plugins");
        descriptor.setArtifactId("maven-it-plugin");
        descriptor.setVersion("0.1");
        List<String> errors = new ArrayList<>();