testSetHighlightedSizeUpdatesLiveRegion() {
    picker.render();

    const sayFunction = recordFunction();
    /** @suppress {visibility} suppression added to enable type checking */
    renderer.announcer_.say = sayFunction;
    renderer.setHighlightedSize(picker, 3, 7);

    assertEquals(1, sayFunction.getCallCount());

    assertTrue(googArray.equals(
        ['3 by 7', LivePriority.ASSERTIVE],
        sayFunction.getLastCall().getArguments()));
  }
Tests that the right aria label is added when the highlighted
size changes.