@After
  public void cleanUp() throws Exception {
    if (accountService != null) {
      accountService.close();
    }
    assertEquals("No TopicListeners should still be attached to Notifier", 0,
        notifier.topicToListenersMap.getOrDefault(ACCOUNT_METADATA_CHANGE_TOPIC, Collections.emptySet()).size());
    deleteStoreIfExists();
    deleteBackupDirectoryIfExist();
  }
Cleans up if the store already exists.
@throws Exception Any unexpected exception.
ambry-account/src/test/java/com/github/ambry/account/HelixAccountServiceTest.java