code: def __init__(self, items, next_marker=None):
      self.items = items
      self.next_marker = next_marker
  
imports: import base64
  import os
  import posixpath
  from unittest import mock
  import pytest
  from azure.storage.blob import BlobPrefix, BlobProperties, BlobServiceClient
  from mlflow.entities.multipart_upload import MultipartUploadPart
  from mlflow.exceptions import MlflowException
  from mlflow.store.artifact.artifact_repository_registry import get_artifact_repository
  from mlflow.store.artifact.azure_blob_artifact_repo import AzureBlobArtifactRepository
label_desc: Use image node_id 1 to create a new MockBlobList object  with example: obj = MockBlobList(items, next_marker)