Testing data repositories with Testcontainers

The first step when it comes to using Testcontainers is configuring the test case. To talk to a Postgres database, do this:

@Testcontainers
@DataJpaTest
@AutoConfigureTestDatabase(replace = Replace.NONE)
public class VideoRepositoryTestcontainersTest {
  @Autowired VideoRepository repository;
  @Container //
  static final PostgreSQLContainer<?> database = //
    new PostgreSQLContainer<>("postgres:9.6.12") //
      .withUsername("postgres");
}

This framework for test cases can be described as follows:

• @Testcontainers: The annotation from the Testcontainers junit-jupiter module that hooks into the life cycle of a JUnit 5 test case.
• @DataJpaTest: Spring Boot Test’s annotation we used in the previous section, indicating that all entity classes and Spring Data JPA repositories should be scanned.
• @AutoConfigureTestDatabase...