为什么我的@Transactional方法在测试时没有回滚？

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

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

    @Autowired
    private MyService myService;

    @Test
    public void testTransactionalMethod() {
        try {
            myService.myTransactionalMethod();
        } catch (Exception e) {
            // 异常被捕获，事务应该回滚
        }
        // 验证数据是否回滚
    }
}

@Service
public class MyService {

    @Transactional(rollbackFor = Exception.class, propagation = Propagation.REQUIRES_NEW)
    public void myTransactionalMethod() throws Exception {
        // 业务逻辑
        throw new Exception("测试回滚");
    }
}