Function focusin

src/aria/menu/menu.spec.ts:600–603

(element: Element)

  let fixture: ComponentFixture<MenuTriggerExample>;

  const focusin = async (element: Element) => {
    element.dispatchEvent(new FocusEvent('focusin', {bubbles: true}));
    await fixture.whenStable();
  };

  const keydown = async (element: Element, key: string, modifierKeys: {} = {}) => {
    await focusin(element);