@Test
  public void testWriteOperations() throws Exception {

    // ------------------------------------------------------
    // Check #createFolder
    // ------------------------------------------------------
    // Not allowed to create a folder in a non FolderItem
    try {
      fileSystemItemManagerService.createFolder(
          DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + file.getId(), "A new folder", principal);
      fail("Folder creation in a non folder item should fail.");
    } catch (NuxeoException e) {
      assertEquals(
          String.format(
              "Cannot create a folder in file system item with id %s because it is not a folder but is: "
                  + "DocumentBackedFileItem(id=\"%s\", name=\"Joe.odt\")",
              DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + file.getId(),
              DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + file.getId()),
          e.getMessage());
    }

    // Folder creation
    FolderItem newFolderItem =
        fileSystemItemManagerService.createFolder(
            DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + folder.getId(), "A new folder", principal);
    assertNotNull(newFolderItem);
    assertEquals(DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + folder.getId(), newFolderItem.getParentId());
    assertEquals("A new folder", newFolderItem.getName());
    DocumentModelList folderChildren =
        session.query(
            String.format(
                "select * from Document where ecm:parentId = '%s' and ecm:primaryType = 'Folder' order by dc:title asc",
                folder.getId()));
    DocumentModel newFolder = folderChildren.get(0);
    assertTrue(newFolder.isFolder());
    assertEquals("A new folder", newFolder.getTitle());

    // Parent folder children check
    assertEquals(
        6,
        fileSystemItemManagerService
            .getChildren(DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + folder.getId(), principal)
            .size());

    // ------------------------------------------------------
    // Check #createFile
    // ------------------------------------------------------
    // File creation
    Blob blob = new StringBlob("Content of a new file.");
    blob.setFilename("New file.odt");
    blob.setMimeType("application/vnd.oasis.opendocument.text");
    FileItem fileItem =
        fileSystemItemManagerService.createFile(newFolderItem.getId(), blob, principal);
    assertNotNull(fileItem);
    assertEquals(newFolderItem.getId(), fileItem.getParentId());
    assertEquals("New file.odt", fileItem.getName());
    folderChildren =
        session.query(
            String.format("select * from Document where ecm:parentId = '%s'", newFolder.getId()));
    assertEquals(1, folderChildren.size());
    DocumentModel newFile = folderChildren.get(0);
    assertEquals("File", newFile.getType());
    assertEquals("New file.odt", newFile.getTitle());
    assertEquals("/syncRoot1/aFolder/A new folder/New file.odt", newFile.getPathAsString());
    Blob newFileBlob = (Blob) newFile.getPropertyValue("file:content");
    assertEquals("New file.odt", newFileBlob.getFilename());
    assertEquals("Content of a new file.", newFileBlob.getString());
    assertEquals(
        "nxfile/test/" + newFile.getId() + "/blobholder:0/New%20file.odt",
        fileItem.getDownloadURL());
    assertEquals("MD5", fileItem.getDigestAlgorithm());
    assertEquals(newFileBlob.getDigest(), fileItem.getDigest());

    // Parent folder children check
    assertEquals(
        1, fileSystemItemManagerService.getChildren(newFolderItem.getId(), principal).size());

    // ------------------------------------------------------
    // Check #updateFile
    // ------------------------------------------------------
    String fileItemId = fileItem.getId();
    String fileItemParentId = fileItem.getParentId();
    blob = new StringBlob("Modified content of an existing file.");
    fileItem = fileSystemItemManagerService.updateFile(fileItemId, blob, principal);
    assertNotNull(fileItem);
    assertEquals(fileItemId, fileItem.getId());
    assertEquals(fileItemParentId, fileItem.getParentId());
    assertEquals("New file.odt", fileItem.getName());
    folderChildren =
        session.query(
            String.format("select * from Document where ecm:parentId = '%s'", newFolder.getId()));
    assertEquals(1, folderChildren.size());
    DocumentModel updatedFile = folderChildren.get(0);
    assertEquals("File", updatedFile.getType());
    assertEquals("New file.odt", updatedFile.getTitle());
    assertEquals("/syncRoot1/aFolder/A new folder/New file.odt", updatedFile.getPathAsString());
    Blob updatedFileBlob = (Blob) updatedFile.getPropertyValue("file:content");
    assertEquals("New file.odt", updatedFileBlob.getFilename());
    assertEquals("Modified content of an existing file.", updatedFileBlob.getString());
    assertEquals(
        "nxfile/test/" + updatedFile.getId() + "/blobholder:0/New%20file.odt",
        fileItem.getDownloadURL());
    assertEquals("MD5", fileItem.getDigestAlgorithm());
    assertEquals(updatedFileBlob.getDigest(), fileItem.getDigest());

    // ------------------------------------------------------
    // Check #delete
    // ------------------------------------------------------
    // File deletion
    fileSystemItemManagerService.delete(
        DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + updatedFile.getId(), principal);
    updatedFile = session.getDocument(new IdRef(updatedFile.getId()));
    assertEquals("deleted", updatedFile.getCurrentLifeCycleState());

    // Parent folder children check
    assertTrue(
        fileSystemItemManagerService.getChildren(newFolderItem.getId(), principal).isEmpty());

    // ------------------------------------------------------
    // Check #rename
    // ------------------------------------------------------
    // Folder rename
    String fsItemId = DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + folder.getId();
    FileSystemItem fsItem =
        fileSystemItemManagerService.rename(fsItemId, "Jack's folder has a new name", principal);
    assertEquals(fsItemId, fsItem.getId());
    String expectedSyncRoot1Id = DEFAULT_SYNC_ROOT_ITEM_ID_PREFIX + syncRoot1.getId();
    assertEquals(expectedSyncRoot1Id, fsItem.getParentId());
    assertEquals("Jack's folder has a new name", fsItem.getName());
    folder = session.getDocument(folder.getRef());
    assertEquals("Jack's folder has a new name", folder.getTitle());

    // File rename with title != filename
    // => should rename filename but not title
    assertEquals("aFile", file.getTitle());
    assertEquals("Joe.odt", ((Blob) file.getPropertyValue("file:content")).getFilename());
    fsItemId = DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + file.getId();
    fsItem = fileSystemItemManagerService.rename(fsItemId, "File new name.odt", principal);
    assertEquals(fsItemId, fsItem.getId());
    assertEquals(DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + folder.getId(), fsItem.getParentId());
    assertEquals("File new name.odt", fsItem.getName());
    file = session.getDocument(file.getRef());
    assertEquals("aFile", file.getTitle());
    Blob fileBlob = (Blob) file.getPropertyValue("file:content");
    assertEquals("File new name.odt", fileBlob.getFilename());
    fileItem = (FileItem) fsItem;
    assertEquals(
        "nxfile/test/" + file.getId() + "/blobholder:0/File%20new%20name.odt",
        fileItem.getDownloadURL());
    assertEquals("MD5", fileItem.getDigestAlgorithm());
    assertEquals(fileBlob.getDigest(), fileItem.getDigest());

    // File rename with title == filename
    // => should rename filename and title
    blob = new StringBlob("File for a doc with title == filename.");
    blob.setFilename("Title-filename equality.odt");
    blob.setMimeType("application/vnd.oasis.opendocument.text");
    fileItem = fileSystemItemManagerService.createFile(newFolderItem.getId(), blob, principal);
    // Note that the PathSegmentService truncates doc title at 24 characters
    newFile =
        session.getDocument(
            new PathRef("/syncRoot1/aFolder/A new folder/Title-filename equality."));
    assertEquals("Title-filename equality.odt", newFile.getTitle());
    assertEquals(
        "Title-filename equality.odt",
        ((Blob) newFile.getPropertyValue("file:content")).getFilename());
    fileItem =
        (FileItem)
            fileSystemItemManagerService.rename(
                DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + newFile.getId(),
                "Renamed title-filename equality.odt",
                principal);
    assertEquals("Renamed title-filename equality.odt", fileItem.getName());
    newFile = session.getDocument(newFile.getRef());
    assertEquals("Renamed title-filename equality.odt", newFile.getTitle());
    newFileBlob = (Blob) newFile.getPropertyValue("file:content");
    assertEquals("Renamed title-filename equality.odt", newFileBlob.getFilename());
    assertEquals(
        "nxfile/test/" + newFile.getId() + "/blobholder:0/Renamed%20title-filename%20equality.odt",
        fileItem.getDownloadURL());
    assertEquals("MD5", fileItem.getDigestAlgorithm());
    assertEquals(newFileBlob.getDigest(), fileItem.getDigest());

    // ------------------------------------------------------
    // Check #move
    // ------------------------------------------------------
    // Not allowed to move a file system item to a non FolderItem
    String srcFsItemId = DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + note.getId();
    String destFsItemId = DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + file.getId();
    try {
      fileSystemItemManagerService.move(srcFsItemId, destFsItemId, principal);
      fail("Move to a non folder item should fail.");
    } catch (NuxeoException e) {
      assertEquals(
          String.format(
              "Cannot move a file system item to file system item with id %s because it is not a folder.",
              DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + file.getId()),
          e.getMessage());
    }

    // Move to a FolderItem
    destFsItemId = DEFAULT_FILE_SYSTEM_ITEM_ID_PREFIX + subFolder.getId();
    FileSystemItem movedFsItem =
        fileSystemItemManagerService.move(srcFsItemId, destFsItemId, principal);
    assertEquals(srcFsItemId, movedFsItem.getId());
    assertEquals(destFsItemId, movedFsItem.getParentId());
    assertEquals("aNote.txt", movedFsItem.getName());
    note = session.getDocument(note.getRef());
    assertEquals("/syncRoot1/aFolder/aSubFolder/aNote", note.getPathAsString());
    assertEquals("aNote", note.getTitle());
  }
  protected void createNewDocument(Element el, DocConfigDescriptor conf) {
    DocumentModel doc = session.createDocumentModel(conf.getDocType());

    String path = resolvePath(el, conf.getParent());
    Object nameOb = resolveName(el, conf.getName());
    String name = null;
    if (nameOb == null) {
      if (log.isDebugEnabled()) {
        log.debug(String.format(MSG_NO_ELEMENT_FOUND, conf.getName(), el.getUniquePath()));
      }
      int idx = 1;
      for (int i = 0; i < docsStack.size(); i++) {
        if (docsStack.get(i).getType().equals(conf.getDocType())) {
          idx++;
        }
      }
      name = conf.getDocType() + "-" + idx;
    } else {
      name = nameOb.toString();
    }
    doc.setPathInfo(path, name);

    if (log.isDebugEnabled()) {
      if (conf.getUpdate()) {
        log.debug(String.format(MSG_UPDATE, path, name, el.getUniquePath(), conf.toString()));
      } else {
        log.debug(String.format(MSG_CREATION, path, name, el.getUniquePath(), conf.toString()));
      }
    }

    try {
      if (conf.getUpdate() && session.exists(doc.getRef())) {
        DocumentModel existingDoc = session.getDocument(doc.getRef());

        // get attributes, if attribute needs to be overwritten, empty in the document
        for (Object e : el.elements()) {
          List<AttributeConfigDescriptor> configs = getAttributConfigs((Element) e);
          if (configs != null) {
            if (!deletedAttributes.containsKey(existingDoc.getId())) {
              deletedAttributes.put(existingDoc.getId(), new ArrayList<String>());
            }
            for (AttributeConfigDescriptor config : configs) {
              String targetDocProperty = config.getTargetDocProperty();
              // check deletedAttributes for attribute which should be overwritten
              // if it is there, don't empty it a second time
              if (config.overwrite
                  && !deletedAttributes.get(existingDoc.getId()).contains(targetDocProperty)) {
                deletedAttributes.get(existingDoc.getId()).add(targetDocProperty);
                existingDoc.setPropertyValue(targetDocProperty, new ArrayList<>());
              }
            }
          }
        }
        doc = existingDoc;
      } else {
        doc = session.createDocument(doc);
      }
    } catch (NuxeoException e) {
      e.addInfo(String.format(MSG_CREATION, path, name, el.getUniquePath(), conf.toString()));
      throw e;
    }
    pushInStack(doc);
    elToDoc.put(el, doc);
  }