paramMap.put("url_exclude_pattern", ".*\\.pdf$");

        boolean result1 = indexUpdateCallback.isUrlCrawlable(paramMap, "http://example.com/test.html");
        boolean result2 = indexUpdateCallback.isUrlCrawlable(paramMap, "http://example.com/test.pdf");

        assertTrue(result1);
        assertFalse(result2);
        assertTrue(paramMap.get("url_exclude_pattern") instanceof Pattern);
    }