em.flush();
em.clear();
author = em.find(OneToOneAuthor.class, author.getId());
assertThat(author).isNotNull();
OneToOneBiography bio = author.getBiography();
assertThat(bio).isNotNull();
assertThat(bio.getInformation()).isEqualToIgnoringCase("Sunghyouk Bae");
author.getBiography().setInformation("debop");
em.persist(author);
em.flush();
em.clear();