The most proper way to test Service/DAO layer

Well, I'm using Spring and Hibernate. Now I am about to create tests for service/dao layer but I wonder what the best solution is.

I've seen some similar questions and here are the solutions people suggested:

(with the help of JUnit, certainly)

• Use in-memory database(H2, etc.)
• Use Mockito and mock a DAO/Service layer

• Use Spring to help to test, viz.:

  Use annotations
  @RunWith(SpringJUnit4ClassRunner.class)
  @ContextConfiguration(classes = {AppConfig.class})

  and then just autowire service/dao and test it.

Thus, the first question is: what's the best solution to test Service layer(considering that I'm using Spring MVC and Hibernate with MySQL)
And the second: should I test DAO layer If I test Service layer(which already consists of DAO's methods)?