private void runTest(boolean reseek, TreeMap<Key,Value> source, TreeMap<Key,Value> result, Collection<ByteSequence> cols) throws IOException {
MapIterator src = new MapIterator(source);
SortedKeyValueIterator<Key,Value> iter = new ChunkCombiner();
iter.init(src, null, null);
iter = iter.deepCopy(null);
iter.seek(new Range(), cols, true);
TreeMap<Key,Value> seen = new TreeMap<Key,Value>();
while (iter.hasTop()) {