@ParameterizedTest
    @MethodSource("preprocessor_args")
    void preprocessor(Service service) throws Exception {
        final Pojo pojo = service.pojo().get();
        assertThat(pojo).isEqualTo(new Pojo("Cony", 26));
    }
Tests https://github.com/line/armeria/pull/386
retrofit2/src/test/java/com/linecorp/armeria/client/retrofit2/ArmeriaCallFactoryTest.java