public List<ArtifactRepository> getRepositories() {
        if (repositories == null) {
            return Collections.emptyList();
        }

        return Collections.unmodifiableList(repositories);
    }

    public MetadataResolutionResult setRepositories(final List<ArtifactRepository> repositories) {
        this.repositories = repositories;

    public List<ArtifactRepository> getRepositories() {
        if (repositories == null) {
            return Collections.emptyList();
        }

        return Collections.unmodifiableList(repositories);
    }

    public ArtifactResolutionResult setRepositories(final List<ArtifactRepository> repositories) {
        this.repositories = repositories;

    @Override
    public void setUp() throws Exception {
        super.setUp();
        pluginHelper = new PluginHelper() {
            @Override
            protected String[] getRepositories() {
                return new String[] { "plugin/repo1/", "plugin/repo2/" };
            }

            @Override
            protected String getRepositoryContent(String url) {

                @Override
                public Artifact[] load(final ArtifactType key) {
                    final List<Artifact> list = new ArrayList<>();
                    for (final String url : getRepositories()) {
                        if (url.endsWith(".yaml")) {
                            if (key == ArtifactType.UNKNOWN) {
                                list.addAll(loadArtifactsFromRepository(url));

            try {
                ArtifactRequest artifactRequest = new ArtifactRequest();
                artifactRequest.setArtifact(RepositoryUtils.toArtifact(artifact));
                artifactRequest.setRepositories(RepositoryUtils.toRepos(remoteRepositories));

                // Maven 2.x quirk: an artifact always points at the local repo, regardless whether resolved or not