private HStoreFile readStoreFile(StoreFileInfo fileinfo) throws Exception {
    // Open the file reader with block cache disabled.
    HStoreFile file = new HStoreFile(fileinfo, BloomType.NONE, cacheConf);
    return file;
  }
This test tests whether parallel {@link StoreScanner#close()} and
{@link StoreScanner#updateReaders(List, List)} works perfectly ensuring that there are no
references on the existing Storescanner readers.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestStoreScannerClosure.java