diff --git a/integrations/weaviate/tests/test_document_store.py b/integrations/weaviate/tests/test_document_store.py
index 736798067..cf9927a3d 100644
--- a/integrations/weaviate/tests/test_document_store.py
+++ b/integrations/weaviate/tests/test_document_store.py
@@ -2,6 +2,7 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
+import base64
 import os
 from typing import List
 from unittest.mock import MagicMock, patch
@@ -17,7 +18,7 @@
     FilterDocumentsTest,
     FilterDocumentsTestWithDataframe,
     WriteDocumentsTest,
-    create_filterable_docs
+    create_filterable_docs,
 )
 from haystack.utils.auth import Secret
 from numpy import array as np_array
@@ -97,7 +98,6 @@ def filterable_docs_with_dataframe(self) -> List[Document]:
                 documents[i].meta["date"] = f"{date}Z"
         return documents
 
-
     def assert_documents_are_equal(self, received: List[Document], expected: List[Document]):
         assert len(received) == len(expected)
         received = sorted(received, key=lambda doc: doc.id)