junit 单元测试事务会自动回滚。通过@Rollback(true)注解来实现，默认是true，事务会回滚，可以不写。false时事务不会回滚，数据会写到数据库中。

实例：

package com.xiaolyuh.service;

import java.util.Date;

import org.junit.Assert;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.test.context.SpringBootTest;

import org.springframework.test.annotation.Rollback;

import org.springframework.test.context.junit4.SpringRunner;

import org.springframework.transaction.annotation.Transactional;

import com.alibaba.fastjson.JSON;

import com.xiaolyuh.entity.RewardCouponDetail;

import com.xiaolyuh.mapper.RewardCouponDetailMapper;

@RunWith(SpringRunner.class)

@SpringBootTest

public class RewardCouponDetailServiceTest{

private static final Logger logger = LoggerFactory.getLogger(RewardCouponDetailServiceTest.class);

@Autowired

private RewardCouponDetailMapper rewardCouponDetailMapper;

@Test

@Transactional //该注解删掉没效果

@Rollback(true)// 事务自动回滚，默认是true。可以不写

public void TestCustomer(){

RewardCouponDetail rewardCouponDetail = new RewardCouponDetail();

rewardCouponDetail.setRewardInfoId(1L);

rewardCouponDetail.setCouponId("1");

rewardCouponDetail.setCouponDetailId(1L);

rewardCouponDetail.setCreateTime(new Date());

rewardCouponDetailMapper.insert(rewardCouponDetail);

logger.info(JSON.toJSONString(rewardCouponDetail));

Assert.assertNotNull(rewardCouponDetail.getId());

}

}