final PagingPredicate predicate = new PagingPredicate(lessEqual, comparator, pageSize);
Set<Integer> keySet = map.keySet(predicate);
assertIterableEquals(keySet, 42, 43, 44, 45, 46);
predicate.nextPage();
assertEquals(46, predicate.getAnchor().getKey());
keySet = map.keySet(predicate);
assertIterableEquals(keySet, 47, 48, 49, 50);
predicate.nextPage();