private MockHelixPropertyStore<ZNRecord> getMockHelixStore(HelixPropertyStoreConfig storeConfig) {
    String storeRootPath = ZK_CLIENT_CONNECT_STRING + storeConfig.rootPath;
    MockHelixPropertyStore<ZNRecord> helixStore = storeKeyToMockStoreMap.get(storeRootPath);
    if (helixStore == null) {
      helixStore = new MockHelixPropertyStore<>();
      storeKeyToMockStoreMap.put(storeRootPath, helixStore);
    }
    return helixStore;
  }
Gets a {@link MockHelixPropertyStore} for the given {@link HelixPropertyStoreConfig}.
@param storeConfig A {@link HelixPropertyStoreConfig}.
@return A {@link MockHelixPropertyStore} defined by the {@link HelixPropertyStoreConfig}.
ambry-commons/src/test/java/com/github/ambry/commons/HelixNotifierTest.java