assertEquals(1, ((List<?>) pom.getValue("build/plugins[1]/executions")).size());
        assertEquals("maven-it-plugin-b", pom.getValue("build/plugins[2]/artifactId"));
        assertEquals(1, ((List<?>) pom.getValue("build/plugins[1]/executions")).size());
        assertEquals("maven-it-plugin-a", pom.getValue("reporting/plugins[1]/artifactId"));

    private Set<Artifact> pluginArtifacts;

    private List<ArtifactRepository> remoteArtifactRepositories;

    private List<ArtifactRepository> pluginArtifactRepositories;

    private List<RemoteRepository> remoteProjectRepositories;

    private List<RemoteRepository> remotePluginRepositories;

    private List<Artifact> attachedArtifacts = new ArrayList<>();

        for (Vertex v : children) {
            DfsState state = stateMap.putIfAbsent(v, DfsState.VISITING);
            if (state == null) {
                visitAll(v.children, stateMap, list);
                stateMap.put(v, DfsState.VISITED);
                list.add(v.label);
            }
        }
        return list;
    }

    private static List<String> visitCycle(

    }

    /**
     * Returns a list suited for the builders, i.e. null if not modified
     */
    private <T> List<T> injectList(List<T> list, Function<T, T> modifer) {
        List<T> newList = null;
        for (int i = 0; i < list.size(); i++) {
            T oldT = list.get(i);
            T newT = modifer.apply(oldT);
            if (newT != oldT) {

        private final boolean resolveManagedVersions;
        private final List<ArtifactRepository> repositories = new ArrayList<>();
        private final int hashCode;

        public CacheKey(
                Artifact artifact,
                boolean resolveManagedVersions,
                ArtifactRepository localRepository,
                List<ArtifactRepository> remoteRepositories) {
            File file = artifact.getFile();

    ArtifactRepository getLocalRepository();

    ProjectBuildingRequest setRemoteRepositories(List<ArtifactRepository> remoteRepositories);

    List<ArtifactRepository> getRemoteRepositories();

    ProjectBuildingRequest setPluginArtifactRepositories(List<ArtifactRepository> pluginArtifactRepositories);

    List<ArtifactRepository> getPluginArtifactRepositories();

    /**

        List<Toolchain> toolchains = toolchainManager.getToolchains(session, "unknown", null);

        assertEquals(0, toolchains.size());
    }

    @Test
    void testModelNoFactory() {
        MavenSession session = mock(MavenSession.class);
        MavenExecutionRequest executionRequest = new DefaultMavenExecutionRequest();
        Map<String, List<ToolchainModel>> toolchainModels = new HashMap<>();

    /**
     * Gets the list of group ids to scan for the plugin prefix.
     *
     * @return The list of group ids to scan for the plugin prefix, never {@code null}.
     */
    List<String> getPluginGroups();

    /**
     * Sets the list of group ids to scan for the plugin prefix.
     *
     * @param pluginGroups The list of group ids to scan for the plugin prefix, may be {@code null}.

            throws ArtifactMetadataRetrievalException;

    List<ArtifactVersion> retrieveAvailableVersions(MetadataResolutionRequest request)
            throws ArtifactMetadataRetrievalException;

    List<ArtifactVersion> retrieveAvailableVersions(
            Artifact artifact, ArtifactRepository localRepository, List<ArtifactRepository> remoteRepositories)

                    List<String> ret = cycle.subList(pos, cycle.size());
                    ret.add(v);
                    return ret;
                }
            }
        }
        return null;
    }

    public static class CycleDetectedException extends Exception {
        private final List<String> cycle;

        CycleDetectedException(String message, List<String> cycle) {
            super(message);