code: @Test public void testAllLogMethod(){
    logger.error("error");
    logger.warn("warn");
    logger.info("info");
    logger.debug("debug");
    logger.trace("info");
    logger.error(new Exception("error"));
    logger.warn(new Exception("warn"));
    logger.info(new Exception("info"));
    logger.debug(new Exception("debug"));
    logger.trace(new Exception("trace"));
    logger.error("error",new Exception("error"));
    logger.warn("warn",new Exception("warn"));
    logger.info("info",new Exception("info"));
    logger.debug("debug",new Exception("debug"));
    logger.trace("trace",new Exception("trace"));
  }
  