HelloService { @Get("/hello") @ProducesText public String helloText() { return "Armeria"; }  @Get("/hello") @ProducesText String helloText(); @Get("/hello") @ProducesJson HttpResponse helloJson();  }
@Test void testHelloService_plainText() { final String res = service.helloText(); assertThat(res).isEqualTo("Armeria"); }