private static String getRandomBlobId(ClusterMap clusterMap, BlobId.BlobDataType blobDataType) {
    PartitionId partitionId = clusterMap.getRandomWritablePartition(MockClusterMap.DEFAULT_PARTITION_CLASS, null);
    return new BlobId(BLOB_ID_VERSION, BlobId.BlobIdType.NATIVE, clusterMap.getLocalDatacenterId(),
        Account.UNKNOWN_ACCOUNT_ID, Container.UNKNOWN_CONTAINER_ID, partitionId, false, blobDataType).getID();
  }
@param clusterMap the {@link ClusterMap} for generating blob IDs.
@param blobDataType the {@link BlobId.BlobDataType}.
@return a new blob ID with the specified {@link BlobId.BlobDataType} and a random UUID.
ambry-router/src/test/java/com/github/ambry/router/RouterTestHelpers.java