How to use the @lumino/virtualdom.h.div function in @lumino/virtualdom

it('should connect a node to a command', () => {
        let called = false;
        const command = 'commandlinker:connect-node';
        const commands = new CommandRegistry();
        const linker = new CommandLinker({ commands });
        let node: HTMLElement;
        let vnode: VirtualNode;
        const disposable = commands.addCommand(command, {
          execute: () => {
            called = true;
          }
        });

        vnode = h.div({
          dataset: linker.populateVNodeDataset(command, undefined)
        });
        node = VirtualDOM.realize(vnode);
        document.body.appendChild(node);

        expect(called).to.equal(false);
        simulate(node, 'click');
        expect(called).to.equal(true);

        document.body.removeChild(node);
        linker.dispose();
        disposable.dispose();
      });
    });

renderCloseIcon(data: IRenderData): VirtualElement {
      return h.div({ className: 'p-TabBar-tabCloseIcon' });
    }

renderLabel(data: IRenderData): VirtualElement {
      let content = this.formatLabel(data);
      return h.div({ className: 'p-MenuBar-itemLabel' }, content);
    }

renderItemIcon(data: IItemRenderData): VirtualElement {
      let className = this.createIconClass(data);
      return h.div({ className }, data.item.iconLabel);
    }

renderItemContent(data: IItemRenderData): VirtualElement {
      return (
        h.div({ className: 'p-CommandPalette-itemContent' },
          this.renderItemLabel(data),
          this.renderItemCaption(data)
        )
      );
    }

renderItemShortcut(data: IItemRenderData): VirtualElement {
      let content = this.formatItemShortcut(data);
      return h.div({ className: 'p-CommandPalette-itemShortcut' }, content);
    }

renderItemCaption(data: IItemRenderData): VirtualElement {
      let content = this.formatItemCaption(data);
      return h.div({ className: 'p-CommandPalette-itemCaption' }, content);
    }

renderShortcut(data: IRenderData): VirtualElement {
      let content = this.formatShortcut(data);
      return h.div({ className: 'p-Menu-itemShortcut' }, content);
    }