code: private static String[] prepareDefaultConf() throws IOException {
      final File templateFolder = new File("test/local-conf-templates");
      final File localConfFolder = new File("local/conf");
      if (!localConfFolder.exists()) {
        FileUtils.copyDirectory(templateFolder, localConfFolder.getParentFile());
        log.info("Copied local conf templates from " + templateFolder.getAbsolutePath());
      }
      log.info("Using conf at " + localConfFolder.getAbsolutePath());
      return new String[]{"-conf", "local/conf"};
    }
docs: To enable "run out of the box for testing".