@BeforeClass
  public static void startCluster() throws Exception {
    initCommon();
    workingDir = SnapshotDescriptionUtils.getWorkingSnapshotDir(rootDir, conf);
    workingFs = workingDir.getFileSystem(conf);
  }
Test that we correctly reload the cache, filter directories, etc.
hbase-server/src/test/java/org/apache/hadoop/hbase/master/snapshot/TestSnapshotFileCache.java