public static void checkParam(String dataId, String group, String content) throws NacosException {
        checkKeyParam(dataId, group);
        if (StringUtils.isBlank(content)) {
            throw new NacosException(NacosException.CLIENT_INVALID_PARAM, CONTENT_INVALID_MSG);
        }
    }
@Test
    void testCheckParamFail() throws NacosException {
        Throwable exception = assertThrows(NacosException.class, () -> {
            
            String dataId = "b";
            String group = "c";
            String content = "";
            ParamUtils.checkParam(dataId, group, content);
        });
        assertTrue(exception.getMessage().contains("content invalid"));
    }