it("should display `'-'` if multiple cell types are selected", async () => {
   const item = ToolbarItems.createCellTypeItem(panel);
   Widget.attach(item, document.body);
   await framePromise();
   const node = item.node.getElementsByTagName(
     'select'
   )[0] as HTMLSelectElement;
   expect(node.value).to.equal('code');
   panel.content.select(panel.content.widgets[1]);
   await framePromise();
   expect(node.value).to.equal('-');
 });

      it('should run and advance when clicked', async () => {
        const button = ToolbarItems.createRunButton(panel);
        const widget = panel.content;

        // Clear and select the first two cells.
        const codeCell = widget.widgets[0] as CodeCell;
        codeCell.model.outputs.clear();
        widget.select(codeCell);
        const mdCell = widget.widgets[1] as MarkdownCell;
        mdCell.rendered = false;
        widget.select(mdCell);

        Widget.attach(button, document.body);
        await context.ready;
        await context.session.ready;
        await context.session.kernel.ready;
        const p = new PromiseDelegate();
        context.session.statusChanged.connect((sender, status) => {
          // Find the right status idle message
          if (status === 'idle' && codeCell.model.outputs.length > 0) {
            expect(mdCell.rendered).to.equal(true);
            expect(widget.activeCellIndex).to.equal(2);
            button.dispose();
            p.resolve(0);
          }
        });
        await framePromise();
        (button.node.firstChild as HTMLElement).click();
        await p.promise;
      }).timeout(30000); // Allow for slower CI

 it("should display `'No Kernel!'` if there is no kernel", async () => {
   const item = Toolbar.createKernelNameItem(session);
   Widget.attach(item, document.body);
   await framePromise();
   expect(
     (item.node.firstChild.lastChild as HTMLElement).textContent
   ).to.equal('No Kernel!');
 });