DocumentOutputUtil { public static String getIframeContentWindowJs() throws IOException { try (InputStream iframeResizeContentWindowFile = DocumentOutputUtil.class.getClassLoader(). getResourceAsStream(IFRAME_CONTENT_WINDOW_JS_PATH)) { return IOUtils.toString(iframeResizeContentWindowFile, "UTF-8"); } }  static void applyCacheKeysToResourceUrls(Document document, long pluginModifiedTimestamp, Locale locale); static String getIframeContentWindowJs(); static String getIframeAdminContentWrapperTemplate(); static Map<String, Object> generateAdminIframeTemplateContext(
            String appBaseUrl, String iframeIdToUse,
            String iframeContextInfo, String queryString);  }
@Test public void getIframeContentWindowJs() throws IOException { String iframeContWinJs = DocumentOutputUtil.getIframeContentWindowJs(); Assert.assertEquals("", iframeContWinJs); }