Testing Spring Boot Applications Andy Wilkinson @ankinson

@ankinson Why Bother Testing At All?

@ankinson

@ankinson Risk None YOLO Tests 0 Lots

@ankinson

@ankinson Unit Tests

@ankinson

@ankinson MockRestServiceServer OkHTTP’s MockWebServer Spring Data Repositories JdbcTemplate

@ankinson Testcontainers

@ankinson https://www.testcontainers.org

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

@ankinson Integration Tests

@ankinson @SpringBootTest

@ankinson Context Caching

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

@ankinson @DirtiesContext

@ankinson Sliced Tests

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

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

@ankinson @MockBean and @SpyBean

@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); } } }

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

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

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