### Question:
FolderServiceImp extends BaseService implements FolderService { @Override public StructuredString serialize(Folder folder, StructuredStringFormat format) { StructuredString folderString; switch (format) { case XML: folderString = new StructuredString( new CanonicalXML().marshal(folder, false), StructuredStringFormat.XML); break; case JSON: folderString = new StructuredString( new CanonicalJson().marshal(folder), StructuredStringFormat.JSON); break; default: throw new UnexpectedSwitchCaseException( "Unsupported target format for serialization of folders: " + format); } return folderString; } @Autowired  FolderServiceImp(
            KnowledgeCacheService knowledgeCacheService,
            DSLContext context,
            ServerConfig serverConfig); @Override ObjectVersionId create(UUID ehrId, Folder content); @Override Optional<FolderDto> get(ObjectVersionId folderId, String path); @Override Optional<FolderDto> getByTimeStamp(ObjectVersionId folderId, Timestamp timestamp, String path); @Override Optional<FolderDto> getLatest(ObjectVersionId folderId, String path); @Override Optional<FolderDto> update(
            ObjectVersionId folderId,
            Folder update,
            UUID ehrId
    ); @Override LocalDateTime delete(ObjectVersionId folderId); @Override StructuredString serialize(Folder folder, StructuredStringFormat format); @Override Integer getLastVersionNumber(ObjectVersionId folderId); @Override Integer getVersionNumberForTimestamp(
            ObjectVersionId folderId,
            Timestamp timestamp
    );  }### Answer:
@Ignore("the tested example contains the empty attributes serialized but the serialization does not print them. Decide about behaviour. " + "The RM does not constraint occurrences 1..1 so serialization can be empty for these attributes/collections.") @Test public void serializesFolderToJson() throws IOException { String value = IOUtils.toString( FolderTestDataCanonicalJson.SIMPLE_EMPTY_FOLDER.getStream(), UTF_8 ); Folder folder = cut.unmarshal(value, Folder.class); StructuredString result = folderService.serialize(folder, StructuredStringFormat.JSON); assertThat(result).isNotNull(); assertThat(result.getFormat()).isEqualTo(StructuredStringFormat.JSON); assertThat(result.getValue()).isEqualToIgnoringWhitespace(value); }
@Test @Ignore public void serializesFolderToXML() throws IOException { String value = IOUtils.toString( FolderTestDataCanonicalJson.SIMPLE_EMPTY_FOLDER.getStream(), UTF_8 ); Folder folder = cut.unmarshal(value, Folder.class); StructuredString result = folderService.serialize(folder, StructuredStringFormat.XML); StructuredString result2 = folderService.serialize(folder, StructuredStringFormat.XML); assertThat(result).isNotNull(); assertThat(result.getFormat()).isEqualTo(StructuredStringFormat.XML); assertThat(result.getValue()).isEqualToIgnoringWhitespace ("<folder xsi:type=\"FOLDER\" xmlns:xsi=\"http: }