Spring Boot Testing & Testcontainers

What is the primary purpose of using `@SpringBootTest` in a test class?

Which of the following annotations provides slice testing for JPA repositories?

What does the `@MockBean` annotation do in a Spring Boot test?

What does the following test verify?

@Autowired
private MockMvc mockMvc;

@Test
void testHelloEndpoint() throws Exception {
    mockMvc.perform(get("/hello"))
           .andExpect(status().isOk())
           .andExpect(content().string("Hello World"));
}

What is the main advantage of using Testcontainers in Spring Boot tests?

What does the following snippet configure?

@Testcontainers
public class UserRepositoryTest {

    @Container
    static PostgreSQLContainer<?> postgres =
        new PostgreSQLContainer<>("postgres:15-alpine");

}

Which method is typically used to register Testcontainers database properties with Spring Boot during tests?

What is the purpose of this code?

@DynamicPropertySource
static void configure(DynamicPropertyRegistry registry) {
    registry.add("spring.datasource.url", postgres::getJdbcUrl);
    registry.add("spring.datasource.username", postgres::getUsername);
    registry.add("spring.datasource.password", postgres::getPassword);
}

What is the purpose of `@TestConfiguration` in Spring Boot testing?

What is this test checking?

@DataJpaTest
class UserRepositoryTest {

    @Autowired
    private UserRepository userRepository;

    @Test
    void testFindByEmail() {
        User user = new User(null, "Alice", "alice@mail.com");
        userRepository.save(user);

        Optional<User> found = userRepository.findByEmail("alice@mail.com");

        assertTrue(found.isPresent());
    }
}