}
@Test
public final void givenAllowingMapObjectWithNullKey_whenWritingMapObjectWithNullKey_thenAllowed() throws JsonProcessingException {
final ObjectMapper mapper = new ObjectMapper();
mapper.getSerializerProvider().setNullKeySerializer(new MyDtoNullKeySerializer());
final MyDto dtoObject = new MyDto();
dtoObject.setStringValue("dtoObjectString");
final Map<String, MyDto> dtoMap = new HashMap<String, MyDto>();