@Test(timeout=60000)
public void testGetBookmarkReturnsBookmarkIterator() {

  LOG.info("Test getBookmark returns proper iterator");
  assertTrue(set.addAll(list));
  Iterator<Integer> bookmark = set.getBookmark();
  assertEquals(bookmark.next(), list.get(0));
  final int numAdvance = list.size()/2;
  for(int i=1; i<numAdvance; i++) {
    bookmark.next();
  }
  Iterator<Integer> bookmark2 = set.getBookmark();
  assertEquals(bookmark2.next(), list.get(numAdvance));
}