@Test
    public void KotlinSpringServerCodegen() {
        KotlinSpringServerCodegen config = new KotlinSpringServerCodegen();

        config.setOutputDir("/tmp/openapi");
        config.setSourceFolder("/src/main/kotlin");
        config.additionalProperties.put(DELEGATE_PATTERN, true);

        final OpenAPIParser openApiParser = new OpenAPIParser();
        final ParseOptions options = new ParseOptions();
        final OpenAPI openAPI =
                openApiParser.readLocation("src/test/resources/3_0/petstore.yaml", null, options)
                        .getOpenAPI();

        final ClientOptInput opts = new ClientOptInput();
        opts.config(config);
        opts.openAPI(openAPI);
        new DefaultGenerator().opts(opts).generate();
    }