public final void testListIteratorNotModifiable() throws Exception {
   DoubleList list = makeUnmodifiableDoubleList();
   assertListIteratorNotModifiable(list.listIterator());
   assertListIteratorNotModifiable(list.subList(0, list.size() - 2).listIterator());
   assertListIteratorNotModifiable(list.listIterator(1));
   assertListIteratorNotModifiable(list.subList(0, list.size() - 2).listIterator(1));
 }
 public final void testSublistNotModifiable() throws Exception {
   DoubleList list = makeUnmodifiableDoubleList();
   assertListNotModifiable(list.subList(0, list.size() - 2));
 }