Set<String> set1 = new TreeSet<String>(); Set<String> set2 = new TreeSet<String>(); MultiIterator<String> it = setUpTwo(set1, set2, null);  while (it.hasNext()) { System.out.println("Removing " + it.next()); it.remove(); }  assertTrue("After removal, set1 not empty", set1.isEmpty()); assertTrue("After removal, set2 not empty", set2.isEmpty());
    public void testRemove()    {    }