import org.junit.Before;

import org.junit.Test;

public class Test_hdfs {

    @Before

    public void int_it (){

        int i = ;

        System.out.println(i+"steps");

    }

    @Test

    public void main (){

        System.out.println("hello junit");

    }

}

<dependency>

      <!--3.0的junit是使用编程的方式来进行测试，而junit4是使用注解的方式来运行junit-->

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>4.12</version>   <!--4.12就是junit4版本-->

      <scope>test</scope>

</dependency>

UsersDao 
package org.logMonitor.dao;

import org.apache.ibatis.annotations.Param;

import org.logMonitor.entity.Users;

/**

 * Created by lenovo on 2018/1/12.

 */

public interface UsersDao {

    /**

     * 添加一名用户

     * @param user

     * @return 插入的行数

     */

    int addUser(Users user);

    /**

     * 删除用户

     * @param userId  用户id

     * @return 如果影响行数>1,代表影响的行数

     */

     void deleteUser(long userId);

    /**

     * 更改用户信息void

     * @param user

     * @return 如果影响行数>1,代表影响的行数

     */

    int updateUser(Users user);

    /**

     * 根据用户id返回用户实体

     * @return

     */

    Users queryById(long userId);

}

UsersDaoTest 
package org.logMonitor.dao;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.logMonitor.entity.Users;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;

import static org.junit.Assert.*;

/**

 * Created by lenovo on 2018/1/13.

 */

//配置spring和junit整合，junit启动时加载springIOC容器

//junit启动时加载springIOC容器

@RunWith(SpringJUnit4ClassRunner.class)

//告诉junit spring的配置文件

@ContextConfiguration("classpath:spring/spring-dao.xml")

public class UsersDaoTest {

    //注入Dao实现类依赖，seckillDao已经初始化好并且放在spring容器中,@Resource会去容器中找

    @Resource UsersDao usersDao;

    @Test

    public void addUser() throws Exception {

        Users users = new Users();

        users.setEmail("123@qq.com");

        users.setMobilePhone("123455");

        int account=usersDao.addUser(users);

        System.out.println(account);

    }

    @Test

    public void deleteUser() throws Exception {

        usersDao.deleteUser(2);

    }

    @Test

    public void updateUser() throws Exception {

        Users users = new Users();

        users.setId(1);

        users.setEmail("123@qq.com");

        users.setMobilePhone("123455");

        int account=usersDao.updateUser(users);

        System.out.println(account);

    }

    @Test

    public void queryById() throws Exception {

        Users users = usersDao.queryById(1);

        System.out.println(users.getId()+"aaaa");

    }

}