Plugin plugin = new Plugin();
                        plugin.setLocation("", element.getLocation(""));
                        plugin.setGroupId(null);
                        mergePlugin(plugin, element, sourceDominant, context);

                        Object key = getPluginKey(element);

                        master.put(key, plugin);

        PluginDescriptor pluginDescriptor = new PluginDescriptor();

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

        return null;
    }

    public static MojoDescriptor createMojoDescriptor(Plugin plugin) {
        final PluginDescriptor descriptor = new PluginDescriptor();
        descriptor.setGroupId(plugin.getGroupId());
        descriptor.setArtifactId(plugin.getArtifactId());
        descriptor.setPlugin(plugin);
        descriptor.setVersion(plugin.getVersion());

            plugins = Collections.emptySet();
        }

        return plugins;
    }

    private Plugin newPlugin(String artifactId, String... goals) {
        Plugin plugin = new Plugin();

        plugin.setGroupId("org.apache.maven.plugins");
        plugin.setArtifactId(artifactId);

        for (String goal : goals) {
            PluginExecution pluginExecution = new PluginExecution();

    void setScope(String scope);

    VersionRange getVersionRange();

    void setVersionRange(VersionRange newRange);

    void selectVersion(String version);

    void setGroupId(String groupId);

    void setArtifactId(String artifactId);

    boolean isSnapshot();

    void setResolved(boolean resolved);

    boolean isResolved();

    public String getModelVersion() {
        return getModel().getModelVersion();
    }

    public String getId() {
        return getModel().getId();
    }

    public void setGroupId(String groupId) {
        getModel().setGroupId(groupId);
    }

    public String getGroupId() {
        String groupId = getModel().getGroupId();

        if ((groupId == null) && (getModel().getParent() != null)) {

        return "repository metadata for: '" + getKey() + "'";
    }

    protected static Metadata createMetadata(Artifact artifact, Versioning versioning) {
        Metadata metadata = new Metadata();
        metadata.setGroupId(artifact.getGroupId());
        metadata.setArtifactId(artifact.getArtifactId());
        metadata.setVersion(artifact.getVersion());
        metadata.setVersioning(versioning);
        return metadata;
    }

        when(artifact2.getVersion()).thenReturn("1");
        artifacts.add(artifact2);

        return artifacts;
    }

    private Model newTestModel() {
        Model model = new Model();
        model.setGroupId("modelGroup1");
        model.setArtifactId("modelArtifact1");
        model.setVersion("modelVersion1");

        return model;
    }

    @Test
    void testDebugEnabled() throws PlexusContainerException {

        Versioning versioning = new Versioning();
        versioning.setSnapshot(snapshot);

        Metadata metadata = new Metadata();
        metadata.setVersioning(versioning);
        metadata.setGroupId(artifact.getGroupId());
        metadata.setArtifactId(artifact.getArtifactId());
        metadata.setVersion(artifact.getBaseVersion());
        metadata.setModelVersion("1.1.0");
        return metadata;
    }

        throw new UnsupportedOperationException("Cannot change the download information for an attached artifact."
                + " It is derived from the main artifact.");
    }

    @Override
    public void setGroupId(String groupId) {
        throw new UnsupportedOperationException(
                "Cannot change the groupId for an attached artifact." + " It is derived from the main artifact.");
    }

    @Override