MockHelixPropertyStore<ZNRecord> getHelixStore(String zkServers, HelixPropertyStoreConfig storeConfig) {
    return storeKeyToMockStoreMap.computeIfAbsent(zkServers + storeConfig.rootPath,
        path -> new MockHelixPropertyStore<>());
  }
Gets a {@link MockHelixPropertyStore} for the given {@link HelixPropertyStoreConfig}.
@param zkServers the ZooKeeper server address.
@param storeConfig A {@link HelixPropertyStoreConfig}.
@return A {@link MockHelixPropertyStore} defined by the {@link HelixPropertyStoreConfig}.
ambry-account/src/test/java/com/github/ambry/account/MockHelixAccountServiceFactory.java