@Override
  public JsonWriter newJsonWriter() {
    stream.setMediaType(JSON);
    return JsonWriter.of(new CacheWriter(new OutputStreamWriter(stream.output(), StandardCharsets.UTF_8)));
  }
@Test
  public void test_newJsonWriter() throws Exception {
    underTest.newJsonWriter();

    verify(response).setContentType(JSON);
    verify(response).getOutputStream();
  }