@Test
public void toJsonReturnsExpected() {

    final CreateThing underTest =
            CreateThing.of(TestConstants.Thing.THING, null, TestConstants.EMPTY_DITTO_HEADERS);
    final JsonObject actualJson = underTest.toJson(FieldType.regularOrSpecial());
    softly.assertThat(actualJson).isEqualTo(KNOWN_JSON);
}