testFocusOnSliderAfterClickIfFocusElementOnSliderDragTrue() {
    const sliderElement = oneThumbSlider.getElement();
    const coords = style.getClientPosition(sliderElement);
    testingEvents.fireClickSequence(
        sliderElement, /* opt_button */ undefined, coords);

    const activeElement = oneThumbSlider.getDomHelper().getActiveElement();
    assertEquals(sliderElement, activeElement);
  }
Tests that focus will be on the top level element when clicking the
slider if `focusElementOnSliderDrag` is true.