This document summarizes different types of tests for Spring Boot applications, including unit tests, integration tests, and sliced tests. It discusses tools for mocking dependencies like MockRestServiceServer, Testcontainers for integration with Docker, and annotations like @MockBean and @SpyBean. Context caching, properties, and dirty context handling are also covered. The document concludes with an upcoming talk on JUnit 5.

1. Testing Spring Boot
Applications
Andy Wilkinson
@ankinson

2. @ankinson
Why Bother Testing At All?

3. @ankinson

4. @ankinson
Risk
None
YOLO
Tests
0 Lots

5. @ankinson

6. @ankinson
Unit Tests

7. @ankinson

8. @ankinson
MockRestServiceServer
OkHTTP’s MockWebServer
Spring Data Repositories
JdbcTemplate

9. @ankinson
Testcontainers

10. @ankinson
https://www.testcontainers.org

11. @ankinson
@SpringBootTest
@Testcontainers(disabledWithoutDocker = true)
@ContextConfiguration(initializers = ExampleIntegrationTests.Initializer.class)
class ExampleIntegrationTests {
@Container
public static CassandraContainer<?> cassandra = new CassandraContainer<>();
static class Initializer
implements ApplicationContextInitializer<ConfigurableApplicationContext> {
@Override
public void initialize(ConfigurableApplicationContext context) {
int cqlPort = cassandra.getMappedPort(CassandraContainer.CQL_PORT);
TestPropertyValues.of("spring.data.cassandra.port=" + cqlPort)
.applyTo(context.getEnvironment());
}
}
}

12. @ankinson
Integration Tests

13. @ankinson
@SpringBootTest

14. @ankinson
Context Caching

15. @ankinson
@SpringBootTest(properties="spring.jmx.enabled=true")
@ActiveProfiles("standalone")
@TestPropertySource(locations="standalone.properties")
class ExampleIntegrationTests {
@Test
void contextLoads() {
}
}
@ContextConfiguration
@Import
@TestPropertySource
@ActiveProfiles
@SpringBootTest

16. @ankinson
@DirtiesContext

17. @ankinson
Sliced Tests

18. @ankinson
@JsonTest
@WebMvcTest
@WebFluxTest
@DataJpaTest
@JdbcTest
@JooqTest
@DataMongoTest
@DataNeo4jTest
@DataRedisTest
@DataLdapTest
@RestClientTest

19. @ankinson
@WebMvcTest@DataJpaTest
OrderRepository
extends JpaRepository<…>
@Controller
OrderController
@Controller
CustomerController
CustomerRepository
extends JpaRepository<…>
@SpringBootApplication
Application

20. @ankinson
@MockBean and @SpyBean

21. @ankinson
@WebMvcTest
class CustomerControllerIntegrationTests {
@Autowired
private MockMvc mockMvc;
@Configuration
static class RepositoryConfiguration {
@Bean
CustomerRepository customers() {
return mock(CustomerRepository.class);
}
@Bean
OrderRepository orders() {
return mock(OrderRepository.class);
}
}
}

22. @ankinson
Customer
Customer
Order
@WebMvcTest
class CustomerControllerTests {
@Autowired
private MockMvc mockMvc;
@MockBean
private CustomerRepository customers;
@MockBean
private OrderRepository orders;
}
😱
(controllers = CustomerController.class)

23. JUnit 5: Evolution and
Innovation
Sam Brannen
Thursday
10:30am–11:40am
Ballroom F

24. Thanks!
Q&A
Andy Wilkinson
@ankinson
#springone@s1p