编写一个JPA测试用例

整合了JPA和mysql需要来测试一下是否可以成功对数据库进行操作，这里写一个简单的单元测试来对之前配置的正确性进行验证。

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依赖导入

首先导入需要的SpringTest包和Junit单元测试包。

        <!-- spring-boot-starter-test依赖 -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <!-- junit依赖 -->        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>4.12</version>            <scope>test</scope>        </dependency>

测试代码

使用如下代码进行测试。
- @SpringBootTest(classes = {Application.class})，使用这个注解并将参数设置为SpringBoot启动类，作用是通过SpringBoot来扫描Bean，以实现自动装配。在1.4之前的版本使用注解@SpringApplicationConfigration。
- 使用@Rollback来设置回滚，如果在测试环境，value设为false可以看到事物提交后的数据库。默认为true。在Spring4.2之前使用注解@TransactionConfiguration(transactionManager = "transactionManager", defaultRollback = false)来设置回滚。

@RunWith(SpringJUnit4ClassRunner.class)@SpringBootTest(classes = {Application.class})@Rollback(value = true)@Transactional(transactionManager = "transactionManager")public class MysqlTest {    private static Logger logger = LoggerFactory.getLogger(MysqlTest.class);    @Autowired    PlayerRepository playerRepository;    @Autowired    TeamRepository teamRepository;    @Autowired    PositionRepository positionRepository;    @Before    public void initData(){        playerRepository.deleteAll();        positionRepository.deleteAll();        teamRepository.deleteAll();        Team team = new Team();        team.setName("湖人队");        teamRepository.save(team);        Assert.assertNotNull(team.getId());        Position position = new Position();        position.setName("SG");        positionRepository.save(position);        Assert.assertNotNull(position.getId());        Player player = new Player();        player.setName("Kobe Bryant");        player.setCreatedate(new Date());        player.setTeam(team);        List<Position> positions = positionRepository.findAll();        Assert.assertNotNull(positions);        player.setPosition(positions);        playerRepository.save(player);        Assert.assertNotNull(player.getId());    }    @Test    public void findPage(){        Pageable pageable = new PageRequest(0, 10, new Sort(Sort.Direction.ASC, "id"));        Page<Player> page = playerRepository.findAll(pageable);        Assert.assertNotNull(page);        for(Player player: page.getContent()){            logger.info("\n========player======== player name:{}, team name:{}, position name:{}\n",                    player.getName(), player.getTeam().getName(), player.getPositions().get(0).getName());        }    }}