@DataJpaTest: This is Spring Boot’s test annotation and indicates that we want it to perform all of its automated scanning of entity class definitions and Spring Data JPA repositories.

@Autowired VideoRepository: Automatically injects an instance of our VideoRepository object to test against.

@BeforeEach: This is JUnit 5’s annotation and ensures that this method runs before each test method.

repository.saveAll(): Using VideoRepository, it saves a batch of test data.