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