}
    }

    @Test
    public void test_transform_noResponseBody() {
        final ResponseData responseData = new ResponseData();
        responseData.setUrl("http://example.com/test.pdf");
        // hasResponseBody() returns false when no body is set

        try {
            transformer.transform(responseData);
            fail("Should throw CrawlingAccessException for no response body");

     */
    protected abstract Extractor getExtractor(ResponseData responseData);

    @Override
    public ResultData transform(final ResponseData responseData) {
        if (responseData == null || !responseData.hasResponseBody()) {
            final String url = responseData != null ? responseData.getUrl() : "unknown";
            throw new CrawlingAccessException("No response body for URL: " + url + ". Cannot transform empty response.");
        }