existingIds.add(execution.getId());
        }

        String base = "default-" + goal;
        String id = base;

        for (int index = 1; existingIds.contains(id); index++) {
            id = base + '-' + index;
        }

        return id;
    }

    static class GoalSpec {

        String groupId;

        String artifactId;

        if (fromProject != null) {
            MavenProject toProject = projectMap.get(toVertex.getLabel());
            fromProject.addProjectReference(toProject);
        }

        if (force && toVertex.getChildren().contains(fromVertex)) {
            graph.removeEdge(toVertex, fromVertex);
        }

        try {
            graph.addEdge(fromVertex, toVertex);
        } catch (CycleDetectedException e) {

    }

    @Deprecated
    public MavenSession(
            PlexusContainer container,
            RepositorySystemSession repositorySession,
            MavenExecutionRequest request,
            MavenExecutionResult result) {
        this.container = container;
        this.request = request;
        this.result = result;
        this.settings = adaptSettings(request);

         * @param qualifier
         * @return an equivalent value that can be used with lexical comparison
         */
        public static String comparableQualifier(String qualifier) {
            if (RELEASE_QUALIFIERS.contains(qualifier)) {
                return String.valueOf(QUALIFIERS.indexOf(""));
            }

            int i = QUALIFIERS.indexOf(qualifier);

     *
     * @param model The model to validate, must not be {@code null}.
     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */
    default void validateFileModel(Model model, ModelBuilderRequest request, ModelProblemCollector problems) {
        // do nothing
    }

            throws Exception {
        ArtifactRepository repo = getLocalRepository();

        MutablePlexusContainer container = (MutablePlexusContainer) getContainer();
        MavenSession mavenSession = createSession(container, repo, executionProperties);
        mavenSession.setCurrentProject(project);
        mavenSession.getRequest().setRootDirectory(rootDirectory);

    protected ProjectBuilder projectBuilder;

    @Inject
    protected RepositorySystem repositorySystem;

    @Inject
    protected PlexusContainer container;

    public PlexusContainer getContainer() {
        return container;
    }

    @BeforeEach
    public void setUp() throws Exception {
        if (getContainer().hasComponent(ProjectBuilder.class, "test")) {

        assertEquals(4, labels.size());
        assertTrue(labels.contains("a"));
        assertTrue(labels.contains("b"));
        assertTrue(labels.contains("c"));
        assertTrue(labels.contains("d"));

        addEdge(graph, "a", "d");
        assertEquals(2, a.getChildren().size());
        assertTrue(a.getChildren().contains(b));
        assertTrue(a.getChildren().contains(d));
        assertEquals(2, d.getParents().size());

import static org.codehaus.plexus.testing.PlexusExtension.getBasedir;

@PlexusTest
public abstract class AbstractCoreMavenComponentTestCase {

    @Inject
    protected PlexusContainer container;

    @Inject
    protected RepositorySystem repositorySystem;

    @Inject
    protected MavenRepositorySystem mavenRepositorySystem;

    @Inject

        if (!pluginArtifact.getGroupId().equals(pluginDescriptor.getGroupId())) {
            errors.add("Plugin's descriptor contains the wrong group ID: " + pluginDescriptor.getGroupId());
        }

        if (!pluginArtifact.getArtifactId().equals(pluginDescriptor.getArtifactId())) {
            errors.add("Plugin's descriptor contains the wrong artifact ID: " + pluginDescriptor.getArtifactId());
        }