一个start包，它不需要有springboot启动类，它只提供一切公用的功能，被其它包依赖就行了，通过META-INF/spring.factories或者META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports来自动注入就可以了，我们以mybatis的start包为例，说一下如何进行单元测试。

测试项目结果

两个实体，方便进行事务测试

@Data
@EqualsAndHashCode(callSuper = true)
@TableName("user")
public class User extends BaseEntity {

	@TableId(value = "id", type = IdType.ASSIGN_ID)
	private String id;

	@NotBlank(message = "名称不能为空")
	private String username;

}
@Data
@EqualsAndHashCode(callSuper = true)
@TableName("user_attribute")
public class UserAttribute extends BaseEntity {

	@TableId(value = "id", type = IdType.ASSIGN_ID)
	private String id;

	@TableField("user_id")
	private String userId;

	@NotBlank(message = "名称不能为空")
	private String name;

	@NotBlank(message = "值不能为空")
	private String value;
}

两个mapper类，进行实体持久化

public interface UserMapper extends BaseMapper<User> {
}
public interface UserAttributeMapper extends BaseMapper<UserAttribute> {
}

一个service类，进行事务管理

@Component
public class UserService implements IUserService {

	@Autowired
	UserMapper userMapper;

	@Autowired
	UserAttributeMapper userAttributeMapper;

	@Transactional(rollbackFor = { Exception.class })
	@Override
	public void insertUser() {
		User user = new User();
		user.setId(UUID.randomUUID().toString());
		user.setUsername("zzl4");
		userMapper.insert(user);

		UserAttribute userAttribute = new UserAttribute();
		userAttribute.setId(UUID.randomUUID().toString());
		userAttribute.setUserId(user.getId());
		userAttribute.setName("realName");
		userAttribute.setValue("占占");
		userAttributeMapper.insert(userAttribute);

	}

}

核心测试类，通过手动注入bean，来实现测试mybatis组成的能力

@EnableTransactionManagement表示开启事务；DataSourceTransactionManagerAutoConfiguration是自动注入事务需要的bean

@EnableTransactionManagement
@SpringBootTest(classes = { MybatisAutoConfiguration.class, DataSourceAutoConfiguration.class,
		MybatisPlusAutoConfiguration.class, DataSource.class, SqlSessionFactory.class,
		DataSourceTransactionManagerAutoConfiguration.class, UserService.class })
@MapperScan(basePackages = "com.lind.common.mybatis.mapper")
public class CurdTest {

	@Autowired
	UserMapper userMapper;

	@Autowired
	IUserService userService;

	@Test
	public void insert() throws IOException {
		User user = new User();
		user.setId(UUID.randomUUID().toString());
		user.setUsername("zzl");
		userMapper.insert(user);
	}

	/**
	 * @DataSourceTransactionManagerAutoConfiguration 注入事务所需的bean
	 * @throws IOException
	 */
	@Test
	public void trans() throws IOException {
		// 开启事务：@EnableTransactionManagement，注入事务的bean:DataSourceTransactionManagerAutoConfiguration
		// 事务需要在新的bean中，不需要在单元测试中直接使用@Transactional
		// 使用@Transactional注解都是用在类的方法上。官网也不建议使用在接口类上面，注解肯定都是用到了aop的思想，即使用了动态代理。而如果使用cglib动态代理肯定没有办法代理接口类
		userService.insertUser();
	}

}

测试类不需要RunWith了，@SpringBootTest直接集成了@ExtendWith注解