BDD Microservices Java Techniques Reflections

1. Tools, techniques and reﬂections BDD-Driven Microservices in Java

2. John Ferguson Smart Introductions “I help teams of smart people   learn to work together more efﬁciently,   to deliver better software faster”

3. Independently Deployable Bounded ContextsLoosely CoupledSingle Responsibility Microservices 101

9. Microservices 101 Movie Catalog Service Authentication Service Shopping Cart Service Delivery Service Payment Service REST/HTTP

10. Microservices 101 Movie Catalog Service Authentication Service Shopping Cart Service Delivery Service Payment Service Event Bus

11. Microservices 101 Movie Catalog Service

12. Microservices 101 Movie Catalog Service Resource

13. Microservices 101 Movie Catalog Service Resource Service Layer Domain model Repositories

14. Microservices 101 Movie Catalog Service Resource Persistance Layer Service Layer Domain model Repositories

15. Microservices 101 Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories

16. The testing pyramid

17. The testing pyramid Unit Tests

18. The testing pyramid Unit Tests Integration Tests

19. The testing pyramid Unit Tests Integration Tests End-to-end Tests

23. The testing pyramid Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Unit Tests

32. The testing pyramid Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Integration Tests

37. The testing pyramid End-to-End Tests Movie Catalog Service Authentication Service Shopping Cart Service Delivery Service Payment Service Event Bus

55. To document how to interact with the microservice To document what the microservice does To ensure the service work correctly To ensure we are delivering valuable functionality Why test our micro-services?

61. “We test our micro-services so we can deploy new features quickly and with conﬁdence”

62. And with aggressive production monitoring Writing executable specifications and living documentation To a sufficient level of confidence Outside-in testing Pragmatic web service testing

68. Outside-in development

69. To deliver software that matters And a common language to build a shared understanding Using examples at multiple levels Collaborate to discover requirements and identify uncertainty The essence of BDD

74. The business owner tells the business analyst what he wants 1 2 The business analyst writes a requirements document 3 The developer translates the requirements into software 4 The tester translates the requirements into test cases 5 The technical writer translates the software into functional and technical documentation A traditional development process How does it work?

85. How does it work? The business owner and the business analyst have a conversation about what he needs. 1 2 3 4 The tester uses these scenarios as the basis for her tests 5 The automated tests provide feedback on progress and help document the application The business analyst, the developer and the tester elaborate the requirements together. The scenarios guide the developer and act as automated tests They define requirements as structured, English- language format "scenarios" A BDD development process

91. But what about micro-services?

94. A different testing pyramid

95. A different testing pyramid Executable Business Speciﬁcations

96. A different testing pyramid Slow-running executable technical speciﬁcations Executable Business Speciﬁcations

97. A different testing pyramid Fast-running executable technical specifications Slow-running executable technical specifications Executable Business Specifications

98. Outside-in development Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Executable Business specs

100. Outside-in development Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Slow-running technical specs

101. Outside-in development Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Slow-running technical specs @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMoviesViaTheRestAPI extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def "should list movies by director"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  List<Movie> movies = when().get("/movies/findByDirector/Clint Eastwood").as(List)  then:  movies.collect {movie -> movie.title} == ["Letters from Iwo Jima", "Gran Torino"]  }

102. Outside-in development Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Fast- running technical specs

103. Outside-in development Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Fast- running technical specs def setup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  } Spock

104. Outside-in development Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Fast- running technical specs

105. Outside-in development Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Fast- running technical specs class MovieControllerSpecs extends Specification {    MovieRepository movieRepository = Mock()    def "should find by director regardless of case (#director -> #filteredDirector)"() {  given:  def controller = new MovieController(repository: movieRepository)  when:  controller.findByDirector(director)  then:  1*movieRepository.findByDirector(filteredDirector)  where:  director | filteredDirector  "Clint Eastwood" | "Clint Eastwood"  "Clint eastwood" | "Clint Eastwood" Spock

106. Micro-service Contracts

107. Micro-service Contracts Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service Delivery Service REST/HTTP

108. Micro-service Contracts Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service REST/HTTP Delivery Service

109. Micro-service Contracts Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service REST/HTTP Consumer Delivery Service

110. Micro-service Contracts Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service REST/HTTP Consumer Producer Delivery Service

111. Micro-service Contracts Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service REST/HTTP Consumer Producer Contract Delivery Service

112. Micro-service Contracts Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service REST/HTTP Contract Delivery Service

113. Micro-service Contracts Movie Catalog Service Resource Persistance Layer Gateway Service Layer Domain model Repositories Shopping Cart Service Delivery Service REST/HTTP Contract Mock Shopping Cart Service

114. Micro-service Contracts REST/HTTP Movie Catalog Service Web app iPhone app Android app

115. Micro-service Contracts REST/HTTP Movie Catalog Service Web app iPhone app Android app Producer

116. Micro-service Contracts REST/HTTP Movie Catalog Service Web app iPhone app Android app Consumer Producer

117. Micro-service Contracts REST/HTTP Movie Catalog Service Web app iPhone app Android app Consumer Producer Consumer

118. Micro-service Contracts REST/HTTP Movie Catalog Service Web app iPhone app Android app Consumer Producer Consumer Consumer

119. Micro-service Contracts REST/HTTP Movie Catalog Service Web app iPhone app Android app Consumer Producer Consumer Consumer Contract

122. Micro-service Contracts REST/HTTP Movie Catalog Service Web app iPhone app Android app Consumer Producer Consumer Consumer Contract The Producer API is the sum of the Consumer Contrats

123. Specialised ToolsPublished speciﬁcationsAutomated Acceptance Criteria Verifying the contracts

128. PactPactoMountebank More specialised tools

135. Pact and Pacto  Consumer Driven Contract Testing 42 Consumer Movie Catalog Service

136. Pact and Pacto  Consumer Driven Contract Testing 42 Consumer Movie Catalog Service Mock Service Pact help us create and conﬁgure a mock service

137. Pact and Pacto  Consumer Driven Contract Testing 43 Consumer Movie Catalog Service Mock Service

138. Pact and Pacto  Consumer Driven Contract Testing 43 Consumer Movie Catalog Service Mock Service We write speciﬁcations to describe the expected behaviour of the service

139. Pact and Pacto  Consumer Driven Contract Testing 44 Consumer Movie Catalog Service Mock Service

140. Pact and Pacto  Consumer Driven Contract Testing 44 Consumer Movie Catalog Service Mock Service When we run these speciﬁcations, the expected behaviour is recorded in a ‘pact’ ﬁle asdasdasda asdasdasdas asdasdasd asdasdasda asdasdasdasd asdasdasdasd asdasdasdas

141. Pact and Pacto  Consumer Driven Contract Testing 45 Consumer Movie Catalog Service Mock Service asdasdasda asdasdasdas asdasdasd asdasdasda asdasdasdasd asdasdasdasd asdasdasdas

142. Pact and Pacto  Consumer Driven Contract Testing 45 Consumer Movie Catalog Service Mock Service We can now use this ‘pact’ to test(drive) the service implementation asdasdasda asdasdasdas asdasdasd asdasdasda asdasdasdasd asdasdasdasd asdasdasdas

143. Levels of conﬁdence

144. From BDD to TDD “How much automated testing?  As much as you need, but no more.”

145. Acceptance testing

148. Feature: Adding new movies  In order to sell more movies  As an online movie seller  I want to be able to add movies to the catalog    Scenario: Adding movies  Given the following movie has just come out  | title | director | actors |  | Jurassic World | Colin Trevorrow | Chris Pratt, Bryce Dallas Howard |  When I add this movie to the catalog  Then I should be able to find it in the catalog

150. Feature: Adding new movies  In order to sell more movies  As an online movie seller  I want to be able to add movies to the catalog    Scenario: Adding movies  Given the following movie has just come out  | title | director | actors |  | Jurassic World | Colin Trevorrow | Chris Pratt, Bryce Dallas Howard |  When I add this movie to the catalog  Then I should be able to find it in the catalog @When("I add this movie to the catalog")  public void addMovieToCatalog() {  movieId = rest().given().contentType("application/json")  .content(newMovie)  .post("/movies")  .then().statusCode(200)  .and().extract().jsonPath().getString("id");  }

153. Feature: Adding new movies  In order to sell more movies  As an online movie seller  I want to be able to add movies to the catalog    Scenario: Adding movies  Given the following movie has just come out  | title | director | actors |  | Jurassic World | Colin Trevorrow | Chris Pratt, Bryce Dallas Howard |  When I add this movie to the catalog  Then I should be able to find it in the catalog @Then("I should be able to find it in the catalog")  public void shouldBeAbleToFindMovieInCatalog() {  rest().given().contentType("application/json")  .get("/movies/{movieId}", movieId)  .then().statusCode(200)  .and().body("title", equalTo(newMovie.getTitle()))  .and().body("director", equalTo(newMovie.getDirector()));  }

154. Feature: Adding new movies  In order to sell more movies  As an online movie seller  I want to be able to add movies to the catalog    Scenario: Adding movies  Given the following movie has just come out  | title | director | actors |  | Jurassic World | Colin Trevorrow | Chris Pratt, Bryce Dallas Howard |  When I add this movie to the catalog  Then I should be able to find it in the catalog @Then("I should be able to find it in the catalog")  public void shouldBeAbleToFindMovieInCatalog() {  rest().given().contentType("application/json")  .get("/movies/{movieId}", movieId)  .then().statusCode(200)  .and().body("title", equalTo(newMovie.getTitle()))  .and().body("director", equalTo(newMovie.getDirector()));  } Rest Assured + Serenity

155. Feature: Adding new movies  In order to sell more movies  As an online movie seller  I want to be able to add movies to the catalog    Scenario: Adding movies  Given the following movie has just come out  | title | director | actors |  | Jurassic World | Colin Trevorrow | Chris Pratt, Bryce Dallas Howard |  When I add this movie to the catalog  Then I should be able to find it in the catalog @Then("I should be able to find it in the catalog")  public void shouldBeAbleToFindMovieInCatalog() {  rest().given().contentType("application/json")  .get("/movies/{movieId}", movieId)  .then().statusCode(200)  .and().body("title", equalTo(newMovie.getTitle()))  .and().body("director", equalTo(newMovie.getDirector()));  }

156. Testing REST services with Rest-Assured

157. Testing REST services with Rest-Assured get(“/movies/findByTitle/Gladiator") .then().body("title", equalTo("Gladiator"));

158. Testing REST services with Rest-Assured get(“/movies/findByTitle/Gladiator") .then().body("title", equalTo("Gladiator"));

159. Testing REST services with Rest-Assured when().get(“/movies/findByTitle/Gladiator”) .then().body("nominations.category", hasItems("Best Actor", "Special Effects"));

160. Testing REST services with Rest-Assured when().get(“/movies/findByTitle/Gladiator”) .then().body("nominations.category", hasItems("Best Actor", "Special Effects"));

161. Testing REST services with Rest-Assured given().contentType("application/json")  .content(newMovie)  .post("/movies")  .then().statusCode(200)  .and().extract().jsonPath().getString("id");

162. Testing REST services with Rest-Assured given().contentType("application/json")  .content(newMovie)  .post("/movies")  .then().statusCode(200)  .and().extract().jsonPath().getString("id"); Posting data

163. Testing REST services with Rest-Assured Movie matchingMovie = get("/movies/findByTitle/Gladiator").as(Movie.class);

164. Testing REST services with Rest-Assured Movie matchingMovie = get("/movies/findByTitle/Gladiator").as(Movie.class); Convert responses to Java objects

165. Testing REST services with Rest-Assured given().param("title","Unknown").  when().get("/movies/search").  then().statusCode(404);

166. Testing REST services with Rest-Assured given().param("title","Unknown").  when().get("/movies/search").  then().statusCode(404); Check for errors

167. Resource-level testing

168. Resource-level testing Spock

171. 57 @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMovies extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def setup() {  movieRepository.deleteAll();  RestAssured.port = port;  }    def "should list all movies"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  def movies = when().get("/movies").as(List)  then:  movies.collect {movie -> movie.title} == ["Gladiator",   "Letters from Iwo Jima",   "Gran Torino"]  }

172. 57 @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMovies extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def setup() {  movieRepository.deleteAll();  RestAssured.port = port;  }    def "should list all movies"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  def movies = when().get("/movies").as(List)  then:  movies.collect {movie -> movie.title} == ["Gladiator",   "Letters from Iwo Jima",   "Gran Torino"]  } Spring Context

173. 57 @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMovies extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def setup() {  movieRepository.deleteAll();  RestAssured.port = port;  }    def "should list all movies"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  def movies = when().get("/movies").as(List)  then:  movies.collect {movie -> movie.title} == ["Gladiator",   "Letters from Iwo Jima",   "Gran Torino"]  } Spring Integration Tests

174. 57 @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMovies extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def setup() {  movieRepository.deleteAll();  RestAssured.port = port;  }    def "should list all movies"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  def movies = when().get("/movies").as(List)  then:  movies.collect {movie -> movie.title} == ["Gladiator",   "Letters from Iwo Jima",   "Gran Torino"]  } Rest Assured

175. 57 @ContextConfiguration(loader = SpringApplicationContextLoader.class, classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest("server.port:0")  class WhenFindingMovies extends Specification {    @Autowired  MovieRepository movieRepository;    @Value('${local.server.port}')  int port;    def setup() {  movieRepository.deleteAll();  RestAssured.port = port;  }    def "should list all movies"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA, GRAN_TORINO])  when:  def movies = when().get("/movies").as(List)  then:  movies.collect {movie -> movie.title} == ["Gladiator",   "Letters from Iwo Jima",   "Gran Torino"]  }

176. Controller-level testing

177. Controller-level testing Spock

178. Controller-level testing Spock

179. @ContextConfiguration(loader = SpringApplicationContextLoader.class,  classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest  class WhenViewingActorDetailsViaTheController extends Specification {    @Autowired  ArtistController artistController;    def "should retrieve actor details for an artist"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA,  THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO])  when:  Artist artist = artistController.findArtistDetails("Clint Eastwood")  then:  artist.name == "Clint Eastwood"  and:  artist.filmsActedIn.containsAll(THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO)  and:  artist.filmsDirected.containsAll(LETTERS_FROM_IWO_JIMA, GRAN_TORINO)  }

180. @ContextConfiguration(loader = SpringApplicationContextLoader.class,  classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest  class WhenViewingActorDetailsViaTheController extends Specification {    @Autowired  ArtistController artistController;    def "should retrieve actor details for an artist"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA,  THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO])  when:  Artist artist = artistController.findArtistDetails("Clint Eastwood")  then:  artist.name == "Clint Eastwood"  and:  artist.filmsActedIn.containsAll(THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO)  and:  artist.filmsDirected.containsAll(LETTERS_FROM_IWO_JIMA, GRAN_TORINO)  } Use a fully wired controller

181. @ContextConfiguration(loader = SpringApplicationContextLoader.class,  classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest  class WhenViewingActorDetailsViaTheController extends Specification {    @Autowired  ArtistController artistController;    def "should retrieve actor details for an artist"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA,  THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO])  when:  Artist artist = artistController.findArtistDetails("Clint Eastwood")  then:  artist.name == "Clint Eastwood"  and:  artist.filmsActedIn.containsAll(THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO)  and:  artist.filmsDirected.containsAll(LETTERS_FROM_IWO_JIMA, GRAN_TORINO)  } Use domain objects rather than REST calls

182. @ContextConfiguration(loader = SpringApplicationContextLoader.class,  classes = MovieServiceApplication.class)  @WebAppConfiguration  @IntegrationTest  class WhenViewingActorDetailsViaTheController extends Specification {    @Autowired  ArtistController artistController;    def "should retrieve actor details for an artist"() {  given:  movieCatalogContains([GLADIATOR, LETTERS_FROM_IWO_JIMA,  THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO])  when:  Artist artist = artistController.findArtistDetails("Clint Eastwood")  then:  artist.name == "Clint Eastwood"  and:  artist.filmsActedIn.containsAll(THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO)  and:  artist.filmsDirected.containsAll(LETTERS_FROM_IWO_JIMA, GRAN_TORINO)  }

183. Service or domain-level testing

184. Service or domain-level testing Spock

185. MovieRepository repository  def artistService    def setup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  }

186. MovieRepository repository  def artistService    def setup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  } Mocked repositories

187. MovieRepository repository  def artistService    def setup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  } Call the service

188. MovieRepository repository  def artistService    def setup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  } Check the outcomes

189. MovieRepository repository  def artistService    def setup() {  repository = Mock(MovieRepository)  artistService = new ArtistService(movieRepository: repository)  }    def "should build actor details from films the artist has acted in and has directed"() {  given: "Clint Eastwood has directed some films"  repository.findByDirector("Clint Eastwood") >> [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  and: "Clint Eastwood has starred in some films"  repository.findByActors("Clint Eastwood") >> [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO]  when:  def artistDetails = artistService.findArtistByName("Clint Eastwood")  then:  artistDetails.isPresent()  and:  artistDetails.get().name == "Clint Eastwood" &&  artistDetails.get().filmsActedIn == [THE_GOOD_THE_BAD_AND_THE_UGLY, GRAN_TORINO] &&  artistDetails.get().filmsDirected == [LETTERS_FROM_IWO_JIMA, GRAN_TORINO]  }

190. Living Documentation

191. Living Documentation

192. Living Functional Documentation with Serenity and Cucumber

194. 66

195. 66 Context

196. 66 Context Narrative

197. 67

198. 67 Technical details

199. Living API Documentation   with Swagger Springfox

200. 69 YAML Speciﬁcations Documentation website Client libraries Test stubs

201. 70 @RequestMapping(method = GET)  @ApiOperation("List all the movies in the catalog")  public List<Movie> findAll() {  return repository.findAll();  }    @RequestMapping(method = POST)  @ApiOperation(value = "Add a new movie to the catalog", httpMethod = "POST")  public Movie add(@RequestBody Movie newMovie) {  return repository.save(newMovie);  }    @RequestMapping(value = "/{id}", method = DELETE)  @ApiOperation(value = "Removing a movie from the catalog", httpMethod = "DELETE")  public void delete(@PathVariable String id) {  repository.delete(id);  }  Springfox Some annotations… Swagger and Spring Boot

205. 71 Springfox @EnableAutoConfiguration  @EnableSwagger2  public class MovieServiceApplication {    public static void main(String[] args) {  SpringApplication.run(MovieServiceApplication.class, args);  }    @Bean  public Docket moviesApi() {  return new Docket(DocumentationType.SWAGGER_2)  .select()  .apis(RequestHandlerSelectors.any())  .paths(PathSelectors.any())  .build()  .pathMapping("/")  .directModelSubstitute(LocalDate.class, String.class)  .genericModelSubstitutes(ResponseEntity.class);  }  } Some conﬁguration… Swagger and Spring Boot

206. 72 Springfox Documentation  bundled with your web services Swagger and Spring Boot

207. Production monitoring

208. Automated MonitoringFast provisioningA fast deployment pipeline So you want to micro-service?

209. Automated health checksReal operationsSmoke tests in production Simple checks may not be enough

210. An example with Spring Actuator @Component  public class CatalogHealth implements HealthIndicator {    @Autowired  MovieRepository movieRepository;    @Override  public Health health() {  return (isCatalogStocked()) ?   Health.status(new Status("UP", "Movie count: " + movieRepository.count())).build()   : Health.down().build();  }    private boolean isCatalogStocked() {  return (movieRepository.count() > 0);  }  }

211. An example with Spring Actuator @Component  public class CatalogHealth implements HealthIndicator {    @Autowired  MovieRepository movieRepository;    @Override  public Health health() {  return (isCatalogStocked()) ?   Health.status(new Status("UP", "Movie count: " + movieRepository.count())).build()   : Health.down().build();  }    private boolean isCatalogStocked() {  return (movieRepository.count() > 0);  }  } A Spring Actuator Health Check

212. An example with Spring Actuator @Component  public class CatalogHealth implements HealthIndicator {    @Autowired  MovieRepository movieRepository;    @Override  public Health health() {  return (isCatalogStocked()) ?   Health.status(new Status("UP", "Movie count: " + movieRepository.count())).build()   : Health.down().build();  }    private boolean isCatalogStocked() {  return (movieRepository.count() > 0);  }  } A Spring Actuator Health Check Custom logic to decide if the app is working

213. An example with Spring Actuator @Component  public class MovieTransactionHealth implements HealthIndicator {    @Autowired  MovieController movieController;    @Override  public Health health() {  return Health.status(transactionStatus()).build();  }    private Status transactionStatus() {  try {  Movie movie = new Movie("TEST title", "TEST description", "TEST director", ImmutableList.of("TEST actor"));  Movie reloadedMovie = movieController.add(movie);  movieController.delete(reloadedMovie.getId());  return Status.UP;  } catch (Throwable e) {  return new Status("DOWN", e.toString());  }  }  }

214. An example with Spring Actuator @Component  public class MovieTransactionHealth implements HealthIndicator {    @Autowired  MovieController movieController;    @Override  public Health health() {  return Health.status(transactionStatus()).build();  }    private Status transactionStatus() {  try {  Movie movie = new Movie("TEST title", "TEST description", "TEST director", ImmutableList.of("TEST actor"));  Movie reloadedMovie = movieController.add(movie);  movieController.delete(reloadedMovie.getId());  return Status.UP;  } catch (Throwable e) {  return new Status("DOWN", e.toString());  }  }  } More complex custom logic

215. An example with Spring Actuator @Component  public class MovieTransactionHealth implements HealthIndicator {    @Autowired  MovieController movieController;    @Override  public Health health() {  return Health.status(transactionStatus()).build();  }    private Status transactionStatus() {…}  } @Component  public class CatalogHealth implements HealthIndicator {    @Autowired  MovieRepository movieRepository;    @Override  public Health health() {  return (isCatalogStocked()) ?   Health.status(new Status("UP", "Movie count: " +   movieRepository.count())).build()   : Health.down().build();  }    private boolean isCatalogStocked() {…}  }

216. Try all this out at home! Install Gradle Install MongoDB Clone the repowakaleo/movie-service

217. Questions? John Ferguson Smart john.smart@wakaleo.com wakaleo http://www.wakaleo.com

BDD Microservices Java Techniques Reflections

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