testCheckboxClickMenuClosed() {
    const node = dom.getElement('demoSelectionMenuButton');
    selectionMenuButton.decorate(node);

    const checkbox = dom.getElement('demoCheckbox');
    testingEvents.fireMouseDownEvent(checkbox);
    assertFalse(
        'Menu must be closed when mousedown checkbox',
        selectionMenuButton.isOpen());
    testingEvents.fireMouseUpEvent(checkbox);
    assertFalse(
        'Menu must remain closed when mouseup checkbox',
        selectionMenuButton.isOpen());

    selectionMenuButton.setOpen(true);
    testingEvents.fireClickSequence(checkbox);
    assertFalse(
        'Menu must close when clickin checkbox', selectionMenuButton.isOpen());
  }
Tests that clicking the checkbox does not open the menu