### Question:
GenerateUtil { static void generateCode(ServiceConfig service, String contractLocation, String codeOutput, Map<String, Object> externalConfig, String type) throws IOException { CodeGenerator codeGenerator = GeneratorFactory.getGenerator(CodeGenerator.class, type); if (codeGenerator == null) { throw new RuntimeException("Cannot found code generator's implementation"); } File contractFile = new File(contractLocation); if (contractFile.isDirectory()) { List<CodegenConfigurator> configurators = new ArrayList<>(); Files.walkFileTree(Paths.get(contractFile.toURI()), new SimpleFileVisitor<Path>() { @Override public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { if (Files.isDirectory(file)) { return super.visitFile(file, attrs); } CodegenConfigurator configurator = new CodegenConfigurator(); commonConfig(configurator, service); configurator.setOutputDir(codeOutput) .addAdditionalProperty(GeneratorExternalConfigConstant.PROVIDER_PROJECT_NAME, file.getParent().getFileName() + providerProjectNameSuffix) .addAdditionalProperty(GeneratorExternalConfigConstant.CONSUMER_PROJECT_NAME, file.getParent().getFileName() + consumerProjectNameSuffix) .addAdditionalProperty(GeneratorExternalConfigConstant.MODEL_PROJECT_NAME, file.getParent().getFileName() + modelProjectNameSuffix) .addAdditionalProperty("apiName", file.toFile().getName().split("\\.")[0]) .addAdditionalProperty("microserviceName", file.getParent().getFileName().toString()); configurator.setInputSpec(file.toFile().getCanonicalPath()); configurators.add(configurator); return super.visitFile(file, attrs); } }); Objects.requireNonNull(codeGenerator).configure(Collections.singletonMap("configurators", configurators)); codeGenerator.generate(); } else { CodegenConfigurator configurator = new CodegenConfigurator(); commonConfig(configurator, service); configurator.setOutputDir(codeOutput) .addAdditionalProperty(GeneratorExternalConfigConstant.PROVIDER_PROJECT_NAME, contractFile.getParentFile().getName() + providerProjectNameSuffix) .addAdditionalProperty(GeneratorExternalConfigConstant.CONSUMER_PROJECT_NAME, contractFile.getParentFile().getName() + consumerProjectNameSuffix) .addAdditionalProperty(GeneratorExternalConfigConstant.MODEL_PROJECT_NAME, contractFile.getParentFile().getName() + modelProjectNameSuffix) .addAdditionalProperty("apiName", contractFile.getName().split("\\.")[0]) .addAdditionalProperty("microserviceName", contractFile.getParentFile().getName()); configurator.setInputSpec(contractLocation); Objects.requireNonNull(codeGenerator) .configure(Collections.singletonMap("configurators", Collections.singletonList(configurator))); codeGenerator.generate(); } }  static void generateContract(MavenProject project, String contractOutput, String contractFileType,
      String type);  }### Answer:
@SuppressWarnings("unchecked") @Test public void testGenerateCode() throws Exception { String contractLocation = this.testResourcesEx.getContractLocation(); String projectOutput = "target/GenerateUtilTest/project"; ServiceConfig service = new ServiceConfig(); generateCode(service, contractLocation, projectOutput, Collections.EMPTY_MAP, "default"); assertNotEquals(0, Objects.requireNonNull(new File(projectOutput).listFiles()).length); try { generateCode(service, contractLocation, projectOutput, Collections.EMPTY_MAP, "invalidType"); fail("Run 'testGenerateCode' failed, expected to occur RuntimeException but not"); } catch (RuntimeException e) { assertEquals("Cannot found code generator's implementation", e.getMessage()); } generateCode(service, contractLocation + File.separator + "HelloEndPoint.yaml", projectOutput, Collections.EMPTY_MAP, "default"); assertNotEquals(0, Objects.requireNonNull(new File(projectOutput).listFiles()).length); }