def blob(self, blob_name: str) -> MockBlob:
    """Mocks getting a Blob object (doesn't create it in storage).

    Args:
        blob_name: The name of the blob.

    Returns:
        A MockBlob instance.
    """
    if blob_name not in self.blobs:
      self.blobs[blob_name] = MockBlob(blob_name)
    return self.blobs[blob_name]
Mocks getting a Blob object (doesn't create it in storage).

    Args:
        blob_name: The name of the blob.

    Returns:
        A MockBlob instance.
    
tests/unittests/artifacts/test_artifact_service.py