有一个月没写博客了，以后再忙也要抽时间写啊。

目的

正常情况下，如果要对 UserService 中方法的测试，那么其依赖的 UserDao 也要可以调通，但是，UserDao 可能并不是直接到 DB 的，也可能到各种存储介质中，那么问题就复杂了，我们的目的仅仅是要测试 UserService 中的业务处理逻辑，UserDao 返回的结果并不重要

这种情况下，如果我们能模拟一个 UserDao 返回的结果来供 UserService 处理，就太好了

 

下面通过 Mockito 就能很简单的实现

实现

项目结构

User：

package com.zhengbin.service.test;/** * Created by ZhengBin on 2017/6/30. */public class User {    private Integer id;    private String name;    @Override    public String toString() {        return "User{" +                "id=" + id +                ", name='" + name + '\'' +                '}';    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}

UserDao：

package com.zhengbin.service.test;import java.util.List;/** * Created by ZhengBin on 2017/6/30. */public interface UserDao {    User getUser(int id);        List
      
        getUsers(int id);}
      

UserDaoImpl：

package com.zhengbin.service.test;import java.util.ArrayList;import java.util.List;/** * Created by ZhengBin on 2017/6/30. */public class UserDaoImpl implements UserDao {    public User getUser(int id) {        User user = new User();        user.setId(id);        user.setName("zhengbin");        return user;    }    public List
      
        getUsers(int id) {        List
       
         userList = new ArrayList
        
         ();        User user1 = new User();        user1.setId(1);        user1.setName("zhengbin");        userList.add(user1);        User user2 = new User();        user2.setId(2);        user2.setName("zb");        userList.add(user2);        return userList;    }}
        
       
      

UserService：

package com.zhengbin.service.test;/** * Created by ZhengBin on 2017/6/30. */public interface UserService {    User getUser(int id);}

UserServiceImpl：

package com.zhengbin.service.test;/** * Created by ZhengBin on 2017/6/30. */public class UserServiceImpl implements UserService {    private UserDao userDao;    public User getUser(int id) {        System.out.println("doing something");        return userDao.getUser(id);    }}

MockTest：

package com.zhengbin.service.test;import org.junit.Before;import org.junit.Test;import org.mockito.InjectMocks;import org.mockito.Mock;import org.mockito.Mockito;import org.mockito.MockitoAnnotations;/** * Created by ZhengBin on 2017/6/30. */public class MockTest {    @InjectMocks    private UserServiceImpl userService;    @Mock    private UserDao userDao;    @Before    public void setUp() {        MockitoAnnotations.initMocks(this);    }    @Test    public void testGetUser() {        int id = 1;        User user = new User();        user.setName("mock - zb");        user.setId(0);        Mockito.when(userDao.getUser(1)).thenReturn(user);        System.out.println(userService.getUser(id));    }}