使用JUnit4进行测试时,Spring @transactional不会启动事务

@RunWith(SpringRunner.class)
@DataJpaTest
public class MyRepositoryTest {

    @Autowired
    private TestEntityManager entityManager;

    @Autowired
    private MyRepository repository;

    @Test
    @Transactional
    public void testSave() {
        // 测试代码
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest
public class MyServiceTest {

    @Autowired
    private MyService service;

    @Test
    @Transactional
    public void testService() {
        // 测试代码
    }
}

@RunWith(SpringRunner.class)
@Import(TransactionConfig.class)
public class MyServiceTest {

    @Autowired
    private MyService service;

    @Test
    @Transactional
    public void testService() {
        // 测试代码
    }

    @Configuration
    public static class TransactionConfig {

        @Bean
        public PlatformTransactionManager transactionManager() {
            return new DataSourceTransactionManager(dataSource());
        }

        @Bean
        public DataSource dataSource() {
            // 配置数据源
        }
    }
}