@Override
    public OAuth2AccessTokenDO refreshAccessToken(String refreshToken, String clientId) {
        // 查询访问令牌
        OAuth2RefreshTokenDO refreshTokenDO = oauth2RefreshTokenMapper.selectByRefreshToken(refreshToken);
        if (refreshTokenDO == null) {
            throw exception0(GlobalErrorCodeConstants.BAD_REQUEST.getCode(), "无效的刷新令牌");
        }

        // 校验 Client 匹配
        OAuth2ClientDO clientDO = oauth2ClientService.validOAuthClientFromCache(clientId);
        if (ObjectUtil.notEqual(clientId, refreshTokenDO.getClientId())) {
            throw exception0(GlobalErrorCodeConstants.BAD_REQUEST.getCode(), "刷新令牌的客户端编号不正确");
        }

        // 移除相关的访问令牌
        List<OAuth2AccessTokenDO> accessTokenDOs = oauth2AccessTokenMapper.selectListByRefreshToken(refreshToken);
        if (CollUtil.isNotEmpty(accessTokenDOs)) {
            oauth2AccessTokenMapper.deleteBatchIds(convertSet(accessTokenDOs, OAuth2AccessTokenDO::getId));
            oauth2AccessTokenRedisDAO.deleteList(convertSet(accessTokenDOs, OAuth2AccessTokenDO::getAccessToken));
        }

        // 已过期的情况下，删除刷新令牌
        if (DateUtils.isExpired(refreshTokenDO.getExpiresTime())) {
            oauth2RefreshTokenMapper.deleteById(refreshTokenDO.getId());
            throw exception0(GlobalErrorCodeConstants.UNAUTHORIZED.getCode(), "刷新令牌已过期");
        }

        // 创建访问令牌
        return createOAuth2AccessToken(refreshTokenDO, clientDO);
    }
@Test
    public void testRefreshAccessToken_null() {
        // 准备参数
        String refreshToken = randomString();
        String clientId = randomString();
        // mock 方法

        // 调用，并断言
        assertServiceException(() -> oauth2TokenService.refreshAccessToken(refreshToken, clientId),
                new ErrorCode(400, "无效的刷新令牌"));
    }