### Question:
ScrollViewScrollHandlingDelegate implements ScrollHandlingDelegate, BottomScrollListener { @Override public void pageScrollDown() { if (scrollView != null) { scrollView.pageScroll(ScrollView.FOCUS_DOWN); } } ScrollViewScrollHandlingDelegate(
      @NonNull RequireScrollMixin requireScrollMixin, @Nullable ScrollView scrollView); @Override void onScrolledToBottom(); @Override void onRequiresScroll(); @Override void startListening(); @Override void pageScrollDown();  }### Answer:
@Test public void testPageScrollDown() throws Throwable { delegate.pageScrollDown(); assertThat(scrollView.getScrollY()).isEqualTo(500); }