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SSM单元测试
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1 定义实体类

在/src/main/java/cn/tedu/ssm/entity目录下创建User.java文件：

@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
public class User {
    private int id;
    private String username;
    private String password;
    private String realname;
    private String image;
}

2 定义数据访问接口

在/src/main/java/cn/tedu/ssm/dao目录下创建UserDao.java文件：

public interface UserDao {
    public User getUser(String username);
}

3 实现数据访问接口

在/src/main/resources/mappers目录下创建UserMapper.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.tedu.ssm.dao.UserDao">
    <select id="getUser" resultType="User">
        select id, username, password, realname, image from t_user
        where username=#{username}
    </select>
</mapper>

4 添加JUnit依赖

在/pom.xml文件中添加：

<!-- JUnit -->
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.13.2</version>
    <scope>test</scope>
</dependency>

5 测试数据访问接口

在/src/test/java/cn/tedu/ssm/dao目录下创建UserDaoTest.java文件：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({
    "classpath:spring-context.xml",
    "classpath:spring-mvc.xml",
    "classpath:spring-mybatis.xml"})
public class UserDaoTest {
    @Resource
    private UserDao userDao;

    @Test
    public void testGetUser() {
        User user = userDao.getUser("zhangfei");
        assertNotEquals(null, user);
        System.out.println(user);
    }
}

6 定义服务接口

在/src/main/java/cn/tedu/ssm/services目录下创建UserService.java文件：

public interface UserService {
    public User login(String username, String password);
}

7 实现服务接口

在/src/main/java/cn/tedu/ssm/services/impl目录下创建UserServiceImpl.java文件：

@Service
public class UserServiceImpl implements UserService {
    @Resource
    private UserDao userDao;

    @Override
    @Transactional
    public User login(String username, String password) {
        User user = userDao.getUser(username);
        if (user != null && user.getPassword().equals(password))
            return user;

        return null;
    }
}

8 测试服务接口

在/src/test/java/cn/tedu/ssm/services目录下创建UserServiceTest.java文件：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({
    "classpath:spring-context.xml",
    "classpath:spring-mvc.xml",
    "classpath:spring-mybatis.xml"})
public class UserServiceTest {
    @Resource
    private UserService userService;

    @Test
    public void testLogin() {
        User user = userService.login("zhangfei", "111111");
        assertNotEquals(user, null);
        System.out.println(user);
        assertEquals(userService.login("zhangfei", "123456"), null);
        assertEquals(userService.login("guanyu", "000000"), null);
    }
}

例程：SSM