private void assertKeys(RangeSlicesQuery query, int expected, String start, String end, SliceFilter<Row<String, Integer, Integer>> filter) { RangeSlicesIterator<String, Integer, Integer> iterator = new RangeSlicesIterator<String, Integer, Integer>(query, start, end).setFilter(filter); int total = 0; while(iterator.hasNext()) { iterator.next().getKey(); total ++; } assertEquals(expected, total); } }