1. Let's create a new JpaAuthorRepositoryTests test class in the src/test/java/com/example/bookpub directory at the root of our project with the following content:

import static org.assertj.core.api.Assertions.assertThat; 
 
@RunWith(SpringRunner.class) 
@DataJpaTest 
public class JpaAuthorRepositoryTests { 
    @Autowired 
    private TestEntityManager mgr; 
 
    @Autowired 
    private AuthorRepository repository; 
 
    @Test 
    public void testAuthorEntityBinding() { 
        Long id = mgr.persistAndGetId(createAuthor(),  
                                      Long.class); 
 
        Author author = repository.findById(id).get(); 
         
        assertThat(author.getFirstName()). 
                   isEqualTo("Mark"); 
        assertThat(author.getLastName()). 
                   isEqualTo("Twain"); 
    } 
 
    private Author createAuthor() { 
        return new Author("Mark", "Twain"); 
    } 
} 

2. Execute the tests by running ./gradlew clean test and the tests should continue to pass