@Override
  public ReplicaId getReplica(String partitionName) {
    return getReplicaReturnVal == null ? super.getReplica(partitionName) : getReplicaReturnVal;
  }
The {@link PartitionId} that was provided in the call to {@link #startBlobStore(PartitionId)}
ambry-server/src/test/java/com/github/ambry/server/MockStorageManager.java