public void testRetainSimple2() { set = new LongTreeSet(); set.addAll(range(20)); set.removeAll(range(0, 20, 2)); checkSet(set, range(1, 20, 2)); set = new LongTreeSet(); for (int i = 0; i < 2; i++) { set.addAll(range(2, 25, 2)); set.retain(LongTreeSet.createFromSortedUnique(range(3, 25, 3))); checkSet(set, range(6, 25, 6)); set.clear(); } } }