### Question:
RequireScrollMixin implements Mixin { public void requireScroll() { delegate.startListening(); } RequireScrollMixin(@NonNull TemplateLayout templateLayout); void setScrollHandlingDelegate(@NonNull ScrollHandlingDelegate delegate); void setOnRequireScrollStateChangedListener(
      @Nullable OnRequireScrollStateChangedListener listener); OnRequireScrollStateChangedListener getOnRequireScrollStateChangedListener(); OnClickListener createOnClickListener(@Nullable final OnClickListener listener); void requireScrollWithNavigationBar(@NonNull final NavigationBar navigationBar); void requireScrollWithButton(
      @NonNull Button button, @StringRes int moreText, @Nullable OnClickListener onClickListener); void requireScrollWithButton(
      @NonNull final Button button,
      final CharSequence moreText,
      @Nullable OnClickListener onClickListener); boolean isScrollingRequired(); void requireScroll();  }### Answer:
@Test public void testRequireScroll() { requireScrollMixin.requireScroll(); verify(delegate).startListening(); }