### Question:
WebXmlUtils { public static String getFilterClassName( Document webXml, String filterName ) { return getClassName( "filter", webXml, filterName ); }  static Document asDocument( File webXML ); static List<String> getServletNames( Document webXml ); static List<String> getFilterNames( Document webXml ); static String getServletClassName( Document webXml, String servletName ); static String getFilterClassName( Document webXml, String filterName ); static Map<String, String> getServletInitParams( Document webXml, String servletName ); static Map<String, String> getFilterInitParams( Document webXml, String filterName ); static Set<String> getServletUrlPatterns( Document webXml, String servletName ); static Set<String> getFilterUrlPatterns( Document webXml, String filterName );  }### Answer:
@Test public void testGetFilterClassName() throws Exception { final Document webXml = WebXmlUtils.asDocument( new File( WebXmlUtilsTest.class.getResource( "/org/jivesoftware/util/test-web.xml" ).toURI() ) ); final String filterName = "Set Character Encoding"; final String result = WebXmlUtils.getFilterClassName( webXml, filterName ); assertEquals( "org.jivesoftware.util.SetCharacterEncodingFilter", result ); }