@Test
public void
an_empty_list_is_smaller_than_others() {

   final int lefty = compareLists(Arrays.<Integer>asList(1), Collections.<Integer>emptyList());
   assertEquals(OutCome.LEFT, OutCome.from(lefty));
   final int righty = compareLists(Collections.<Integer>emptyList(), Arrays.<Integer>asList(1));
   assertEquals(OutCome.RIGHT, OutCome.from(righty));
}