@Override
      protected InternalScanner createScanner(HStore store, ScanInfo scanInfo,
        List<StoreFileScanner> scanners, ScanType scanType, long smallestReadPoint,
        long earliestPutTs) throws IOException {
        return scanner;
      }
This method actually does all the work.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/compactions/TestStripeCompactionPolicy.java