title: Running DataJpaTest with PostgreSQL
body: <p>I wrote a jpa test with Spring Boot as explained here:
  <a href="https://spring.io/blog/2016/04/15/testing-improvements-in-spring-boot-1-4" rel="noreferrer">https://spring.io/blog/2016/04/15/testing-improvements-in-spring-boot-1-4</a></p>
  
  <pre><code>@RunWith(SpringRunner.class)
  @DataJpaTest
  public class UserRepositoryTests {
  
  @Autowired
  private TestEntityManager entityManager;
  
  ...
  }
  </code></pre>
  
  <p>This configures a in-memory db by default. How can I configure this test, that it uses my local PostgreSQL db?</p>