ScrollerHelper { public boolean computeScrollOffset() { return mScroller.computeScrollOffset(); } ScrollerHelper(OverScroller overScroller); boolean startScroll(int start, int end); boolean startScroll(int start, int end, int duration); void finish(); boolean isFinished(); boolean computeScrollOffset(); int getCurrX();  }
@Test public void WhenComputeScrollOffset_forwardToOverScroll() { scrollerHelper.computeScrollOffset(); verify(overScroller).computeScrollOffset(); }