assertEquals(newArrayList("b", "d"), list);
    assertFalse(Iterables.retainAll(list, newArrayList("b", "e", "d")));
    assertEquals(newArrayList("b", "d"), list);
  }

  public void testRetainAll_iterable() {
    final List<String> list = newArrayList("a", "b", "c", "d", "e");
    Iterable<String> iterable =
        new Iterable<String>() {
          @Override
          public Iterator<String> iterator() {