@Test
 public void toSortedSet_with_comparator() {
   LazyIterable<Integer> integers = this.newWith(2, 4, 4, 2, 1, 4, 1, 3);
   MutableSortedSet<Integer> set = integers.toSortedSet(Collections.<Integer>reverseOrder());
   Verify.assertSortedSetsEqual(
       TreeSortedSet.newSetWith(Collections.<Integer>reverseOrder(), 1, 2, 3, 4), set);
 }
 @Test
 public void toSortedSet() {
   LazyIterable<Integer> integers = this.newWith(2, 4, 1, 3, 2, 1, 3, 4);
   MutableSortedSet<Integer> set = integers.toSortedSet();
   Verify.assertSortedSetsEqual(TreeSortedSet.newSetWith(1, 2, 3, 4), set);
 }