taskList.clear();
                }
            };
            manager.init();
            assertEquals(new File(varDir, "thumbnails").getAbsolutePath(), manager.baseDir.getAbsolutePath());
            manager.destroy();
        } finally {
            System.clearProperty(Constants.FESS_VAR_PATH);
        }
    }

    }

    /**
     * Generates a thumbnail for the given ID and saves it to the output file.
     * @param thumbnailId The ID of the thumbnail to generate.
     * @param outputFile The file where the thumbnail will be saved.
     * @return True if thumbnail generation was successful, false otherwise.
     */
    @Override
    public boolean generate(final String thumbnailId, final File outputFile) {

    }

    public void test_getThumbnailPath() {
        Path thumbPath = ResourceUtil.getThumbnailPath("thumb.png");
        assertNotNull(thumbPath);
        assertTrue(thumbPath.toString().contains("thumbnails"));
    }

    public void test_getSitePath() {
        Path sitePath = ResourceUtil.getSitePath("site.xml");
        assertNotNull(sitePath);
        assertTrue(sitePath.toString().contains("site"));
    }

thumbnail.html.image.format=png
# XPath to select images for thumbnails.
thumbnail.html.image.xpath=//IMG
# File extensions to exclude from thumbnail generation.
thumbnail.html.image.exclude.extensions=svg,html,css,js
# Interval for thumbnail generator.
thumbnail.generator.interval=0
# Targets for thumbnail generator (e.g., all).
thumbnail.generator.targets=all

        INGEST("fess-ingest"), //
        /** Script plugins */
        SCRIPT("fess-script"), //
        /** Web application plugins */
        WEBAPP("fess-webapp"), //
        /** Thumbnail generator plugins */
        THUMBNAIL("fess-thumbnail"), //
        /** Crawler plugins */
        CRAWLER("fess-crawler"), //
        /** Unknown/generic JAR files */
        UNKNOWN("jar");

    String THUMBNAIL_HTML_IMAGE_THUMBNAIL_WIDTH = "thumbnail.html.image.thumbnail.width";

    /** The key of the configuration. e.g. 100 */
    String THUMBNAIL_HTML_IMAGE_THUMBNAIL_HEIGHT = "thumbnail.html.image.thumbnail.height";

    /** The key of the configuration. e.g. png */
    String THUMBNAIL_HTML_IMAGE_FORMAT = "thumbnail.html.image.format";

    /** The key of the configuration. e.g. //IMG */

  check_command convert
  check_command pdftoppm
  check_command unoconv
  tmp_pdf_file=/tmp/thumbnail.$$.pdf
  unoconv -e PageRange=1-1 -o ${tmp_pdf_file} -f pdf "${target_file}"
  if [[ ! -f ${tmp_pdf_file} ]] ; then
    echo "unoconv does not work."
    exit 1
  fi
  tmp_png_prefix=/tmp/thumbnail.png.$$
  pdftoppm -png -singlefile ${tmp_pdf_file} ${tmp_png_prefix}
  tmp_png_file="${tmp_png_prefix}.png"

        // Test successful thumbnail generation
        String thumbnailId = "test-thumbnail-001";
        assertTrue(thumbnailGenerator.generate(thumbnailId, tempOutputFile));
        assertTrue(tempOutputFile.exists());
    }

    public void test_generate_withNullThumbnailId() {
        // Test generation with null thumbnail ID
        assertFalse(thumbnailGenerator.generate(null, tempOutputFile));

        }
        return value;
    }

    /**
     * Updates the thumbnail field in the search index.
     * @param thumbnailId The thumbnail ID.
     * @param value The thumbnail value to update.
     */
    protected void updateThumbnailField(final String thumbnailId, final String value) {
        // TODO bulk
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        // Test that generate always returns false
        File outputFile = new File("test.jpg");
        assertFalse(emptyGenerator.generate("thumbnailId", outputFile));
        assertFalse(emptyGenerator.generate(null, outputFile));
        assertFalse(emptyGenerator.generate("thumbnailId", null));
        assertFalse(emptyGenerator.generate(null, null));
    }

    public void test_destroy() {
        // Initialize without container