data = "<img src=\"http://example/foo.jpg\">" //
                + "<img src=\"http://example/bar.jpg\" width=\"100\" height=\"100\">";
        expected = "http://example/bar.jpg";
        assertGetThumbnailUrl(data, expected);

        data = "<img src=\"http://example/foo.jpg\" width=\"100\" height=\"100\">";
        expected = "http://example/foo.jpg";
        assertGetThumbnailUrl(data, expected);

    }

    private void assertImageSize(File file, int width, int height) throws IOException {
        BufferedImage img = ImageIO.read(file);
        logger.debug("width: {}, height: {}", img.getWidth(), img.getHeight());
        assertEquals("Image Width", width, img.getWidth());
        assertEquals("Image Height", height, img.getHeight());
    }

            });
            task.from(extension.getCssFiles(), sub -> sub.into("css"));
            task.from(extension.getUserManual().getRoot().dir("img"), sub -> {
                sub.include("**/*.png", "**/*.gif", "**/*.jpg", "**/*.svg");
                sub.into("img");
            });
            task.from(extension.getUserManual().getResources());

            task.from(generateDocinfo);

            for (int i = 0; i < imgNodeList.size(); i++) {
                final Node imgNode = imgNodeList.get(i);
                if (logger.isDebugEnabled()) {
                    logger.debug("img tag: {}", imgNode);
                }
                final NamedNodeMap attributes = imgNode.getAttributes();
                final String thumbnailUrl = getThumbnailSrc(responseData.getUrl(), attributes);

    /** 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 */
    String THUMBNAIL_HTML_IMAGE_XPATH = "thumbnail.html.image.xpath";

    /** The key of the configuration. e.g. svg,html,css,js */

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