it('should activate the callback', async () => {
   let called = false;
   const button = new ToolbarButton({
     onClick: () => {
       called = true;
     }
   });
   Widget.attach(button, document.body);
   await framePromise();
   simulate(button.node.firstChild as HTMLElement, 'click');
   expect(called).to.equal(true);
   button.dispose();
 });

  const createFileBrowser = (
    id: string,
    options: IFileBrowserFactory.IOptions = {}
  ) => {
    const model = new FileBrowserModel({
      manager: docManager,
      driveName: options.driveName || '',
      state: options.state === null ? null : options.state || state
    });
    const widget = new FileBrowser({
      id,
      model,
      commands: options.commands || commands
    });
    const { registry } = docManager;

    // Add a launcher toolbar item.
    let launcher = new ToolbarButton({
      className: 'jp-AddIcon',
      onClick: () => {
        return createLauncher(commands, widget);
      },
      tooltip: 'New Launcher'
    });
    launcher.addClass('jp-MaterialIcon');
    widget.toolbar.insertItem(0, 'launch', launcher);

    // Add a context menu handler to the file browser's directory listing.
    let node = widget.node.getElementsByClassName('jp-DirListing-content')[0];
    node.addEventListener('contextmenu', (event: MouseEvent) => {
      event.preventDefault();
      const model = widget.modelForClick(event);
      const menu = createContextMenu(model, commands, registry);
      menu.open(event.clientX, event.clientY);
    });

    // Track the newly created file browser.
    tracker.add(widget);

    return widget;
  };

function createApp(manager: ServiceManager.IManager): void {
  let widgets: Widget[] = [];
  let activeWidget: Widget;

  let opener = {
    open: (widget: Widget) => {
      if (widgets.indexOf(widget) === -1) {
        dock.addWidget(widget, { mode: 'tab-after' });
        widgets.push(widget);
      }
      dock.activateWidget(widget);
      activeWidget = widget;
      widget.disposed.connect((w: Widget) => {
        let index = widgets.indexOf(w);
        widgets.splice(index, 1);
      });
    }
  };

  let docRegistry = new DocumentRegistry();
  let docManager = new DocumentManager({
    registry: docRegistry,
    manager,
    opener
  });
  let editorServices = {
    factoryService: new CodeMirrorEditorFactory(),
    mimeTypeService: new CodeMirrorMimeTypeService()
  };
  let wFactory = new FileEditorFactory({
    editorServices,
    factoryOptions: {
      name: 'Editor',
      modelName: 'text',
      fileTypes: ['*'],
      defaultFor: ['*'],
      preferKernel: false,
      canStartKernel: true
    }
  });
  docRegistry.addWidgetFactory(wFactory);

  let commands = new CommandRegistry();

  let fbModel = new FileBrowserModel({ manager: docManager });
  let fbWidget = new FileBrowser({
    id: 'filebrowser',
    commands,
    model: fbModel
  });

  // Add a creator toolbar item.
  let creator = new ToolbarButton({
    className: 'jp-AddIcon',
    onClick: () => {
      docManager.newUntitled({
        type: 'file',
        path: fbModel.path
      }).then(model => {
        docManager.open(model.path);
      });
    }
  });
  creator.addClass('jp-MaterialIcon');
  fbWidget.toolbar.insertItem(0, 'create', creator);

  let panel = new SplitPanel();
  panel.id = 'main';
  panel.addWidget(fbWidget);
  SplitPanel.setStretch(fbWidget, 0);
  let dock = new DockPanel();
  panel.addWidget(dock);
  SplitPanel.setStretch(dock, 1);
  dock.spacing = 8;

  document.addEventListener('focus', event => {
    for (let i = 0; i < widgets.length; i++) {
      let widget = widgets[i];
      if (widget.node.contains(event.target as HTMLElement)) {
        activeWidget = widget;
        break;
      }
    }
  });

  // Add commands.
  commands.addCommand('file-open', {
    label: 'Open',
    icon: 'fa fa-folder-open-o',
    mnemonic: 0,
    execute: () => {
      each(fbWidget.selectedItems(), item => {
        docManager.openOrReveal(item.path);
      });
    }
  });
  commands.addCommand('file-rename', {
    label: 'Rename',
    icon: 'fa fa-edit',
    mnemonic: 0,
//.........这里部分代码省略.........