DocMap docMap = new DocMap(parentMap);

        assertTrue(docMap.isEmpty());
        assertEquals(0, docMap.size());

        docMap.put("key1", "value1");
        assertFalse(docMap.isEmpty());
        assertEquals(1, docMap.size());

        docMap.put("key2", "value2");
        assertFalse(docMap.isEmpty());
        assertEquals(2, docMap.size());

        docMap.clear();

        assertEquals(sitePath, viewHelper.getSitePath(docMap));

        urlLink = "www.google.com";
        sitePath = "www.google.com";
        docMap.put(fieldName, urlLink);
        assertEquals(sitePath, viewHelper.getSitePath(docMap));

        urlLink = "smb://123.45.678.91/share1";
        sitePath = "123.45.678.91/share1";
        docMap.put(fieldName, urlLink);

        Map<String, Object> docMap = new HashMap<>();
        docMap.put("mimetype", "application/pdf");
        assertTrue(thumbnailGenerator.isTarget(docMap));
    }

    @Test
    public void test_isTarget_withUnsupportedMimeType() {
        // Test with unsupported document type
        Map<String, Object> docMap = new HashMap<>();
        docMap.put("mimetype", "application/unknown");

        thumbnailManager.add(generator);

        Map<String, Object> docMap = new HashMap<>();
        docMap.put("_id", "docid1");
        docMap.put("url", "http://example.com");

        boolean result = thumbnailManager.offer(docMap);
        assertTrue(result);
    }

    // Test offer with no matching generator
    @Test

            docMap.put(fessConfig.getResponseFieldContentDescription(), viewHelper.getContentDescription(docMap));
            docMap.put(fessConfig.getResponseFieldUrlLink(), viewHelper.getUrlLink(docMap));
            docMap.put(fessConfig.getResponseFieldSitePath(), viewHelper.getSitePath(docMap));
        }

        if (!docMap.containsKey(Constants.SCORE)) {
            final float score = searchHit.getScore();

        }
    }

    @Override
    public boolean isTarget(final Map<String, Object> docMap) {
        final String thumbnailFieldName = ComponentUtil.getFessConfig().getIndexFieldThumbnail();
        if (logger.isDebugEnabled()) {
            logger.debug("[{}] thumbnail: {}", name, docMap.get(thumbnailFieldName));
        }
        if (!docMap.containsKey(thumbnailFieldName)) {
            return false;
        }

                    if (viewHelper != null && !docMap.isEmpty()) {
                        docMap.put(fessConfig.getResponseFieldContentTitle(), viewHelper.getContentTitle(docMap));
                        docMap.put(fessConfig.getResponseFieldContentDescription(), viewHelper.getContentDescription(docMap));
                        docMap.put(fessConfig.getResponseFieldUrlLink(), viewHelper.getUrlLink(docMap));

        }
        return false;
    }

    /**
     * Gets the image filename for a document based on its document map.
     *
     * @param docMap the document data map
     * @return the generated image filename
     */
    protected String getImageFilename(final Map<String, Object> docMap) {

        // when proper conditions are not met.

        Map<String, Object> docMap = new HashMap<>();

        // This will return false because getFessConfig() will fail
        // We verify the method handles the case gracefully
        try {
            emptyGenerator.isTarget(docMap);
        } catch (IllegalStateException e) {
            // Expected when container is not initialized

     *
     * @param path the file path or URL of the document
     * @param docMap the document metadata map containing field values
     * @return a tuple containing the generator name, thumbnail ID, and path
     */
    @Override
    public Tuple3<String, String, String> createTask(final String path, final Map<String, Object> docMap) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();