code: private void debug(String format, Object... message) {
          Boolean DEBUG = Boolean.valueOf(System.getProperty("arquillian.debug"));
          if (DEBUG) {
              log.log(Level.WARNING, format, message);
          }
      }
docs: Prints debug message.
  
  If arquillian.debug flag is set.
  
  @param format format of message
  @param message message objects to format