Why is the entity manager not null in the spring boot test parent but it is null in the repository?

I've got the entity manager in the parent test class

@RunWith(SpringRunner.class)
@SpringBootTest(
    properties = {
            "spring.profiles.active=test",
            "spring.config.name=app-test"})
public abstract class ViewerTestBase extends DbBuilderImpl {

@Autowired EntityManager em;

The entity manager here is OK. DbBuilder sets up test data. In the @repository it is null

@Repository public class PaymentTransactionDao {
@Autowired EntityManager em;

Causing the test case to fail.

The entity manager is mapped to the h2 database for tests.

The persistence config class is boiler plate

@Configration
@EnableTransactionManagement
public class PersistenceConfig {

  @Bean
  public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder) {
    LocalContainerEntityManagerFactoryBean em = builder.dataSource(viewerDataSource())
            .packages("viewer.model")
            .persistenceUnit("viewer")
            .build();
    return em;
  }

  @Bean
  public PlatformTransactionManager transactionManager(
        EntityManagerFactory viewerEntityManagerFactory) {
    return new JpaTransactionManager(pspEntityManagerFactory);
  }

  @Bean
  @Primary
  @ConfigurationProperties(prefix = "viewer.dbo.datasource")
  public DataSource viewerDataSource() {
    return DataSourceBuilder.create().build();
  }

  @Bean
  @ConfigurationProperties(prefix = "viewer.auth.datasource")
  public DataSource authDataSource() {
    return DataSourceBuilder.create().build();
  }

Setup with spring boot starter jpa

compile group: 'org.springframework.boot', name: 'spring-boot-starter-web'
compile("org.springframework.boot:spring-boot-devtools")
compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa'

testCompile group: 'junit', name: 'junit', version: '4.12'
testCompile group: 'com.h2database', name: 'h2'
testCompile('org.springframework.boot:spring-boot-starter-test')
testCompile group: 'org.springframework.boot', name: 'spring-boot-test'
testCompile group: 'org.springframework.boot', name: 'spring-boot-test-autoconfigure'