*
     * @param artifactType the type of artifacts to retrieve
     * @return an array of installed artifacts
     */
    public Artifact[] getInstalledArtifacts(final ArtifactType artifactType) {
        if (artifactType == ArtifactType.UNKNOWN) {
            final File[] jarFiles = ResourceUtil.getPluginJarFiles((d, n) -> {
                for (final ArtifactType type : ArtifactType.values()) {

        assertEquals(ArtifactType.THEME, ArtifactType.getType("fess-theme-test"));
        assertEquals(ArtifactType.INGEST, ArtifactType.getType("fess-ingest-test"));
        assertEquals(ArtifactType.SCRIPT, ArtifactType.getType("fess-script-test"));
        assertEquals(ArtifactType.WEBAPP, ArtifactType.getType("fess-webapp-test"));

        final List<Map<String, String>> result = new ArrayList<>();
        for (final PluginHelper.ArtifactType artifactType : PluginHelper.ArtifactType.values()) {
            result.addAll(Arrays.stream(pluginHelper.getAvailableArtifacts(artifactType))
                    .map(AdminPluginAction::beanToMap)
                    .collect(Collectors.toList()));
        }
        return result;