testGetSetRole() {
    assertNull('someDiv\'s role should be null', aria.getRole(someDiv));
    assertNull('someSpan\'s role should be null', aria.getRole(someSpan));

    aria.setRole(someDiv, Role.MENU);
    aria.setRole(someSpan, Role.MENU_ITEM);

    assertEquals(
        'someDiv\'s role should be MENU', Role.MENU, aria.getRole(someDiv));
    assertEquals(
        'someSpan\'s role should be MENU_ITEM', Role.MENU_ITEM,
        aria.getRole(someSpan));

    const div = dom.createElement(TagName.DIV);
    dom.appendChild(sandbox, div);
    dom.appendChild(
        div,
        dom.createDom(TagName.SPAN, {id: 'anotherSpan', role: Role.CHECKBOX}));
    assertEquals(
        'anotherSpan\'s role should be CHECKBOX', Role.CHECKBOX,
        aria.getRole(dom.getElement('anotherSpan')));
  }
@suppress {checkTypes} suppression added to enable type checking