@Test
public void toJsonReturnsExpectedJson() {

    final SudoRetrieveThingsResponse underTest = SudoRetrieveThingsResponse.of(KNOWN_THINGS, FieldType.notHidden(),
            EMPTY_DITTO_HEADERS);
    final JsonObject actualJson = underTest.toJson(FieldType.regularOrSpecial());
    assertThat(actualJson).isEqualTo(KNOWN_JSON);
}