checkSimpleDto(dtoImpl, fooString, intValue);
// Make it json and pull it back out.
Gson gson = new GsonBuilder().serializeNulls().create();
String serialized = dtoImpl.toJson();
assertEquals(dtoToJson(gson, dtoImpl), serialized);
SimpleDto dto = SimpleDtoImpl.fromJsonString(serialized);
checkSimpleDto(dto, fooString, intValue);
}