add test

integrations/mongodb_atlas/tests/test_document_store.py

@@ -3,6 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0
 import os
 from uuid import uuid4
+from unittest.mock import patch
 
 import pytest
 from haystack.dataclasses.document import ByteStream, Document
@@ -16,13 +17,23 @@
 from pymongo.driver_info import DriverInfo
 
 
+@patch("haystack_integrations.document_stores.mongodb_atlas.document_store.MongoClient")
+def test_init_is_lazy(_mock_client):
+    MongoDBAtlasDocumentStore(
+        mongo_connection_string=Secret.from_token("test"),
+        database_name="database_name",
+        collection_name="collection_name",
+        vector_search_index="cosine_index",
+    )
+    _mock_client.assert_not_called()
+
+
 @pytest.mark.skipif(
     "MONGO_CONNECTION_STRING" not in os.environ,
     reason="No MongoDB Atlas connection string provided",
 )
 @pytest.mark.integration
 class TestDocumentStore(DocumentStoreBaseTests):
-
     @pytest.fixture
     def document_store(self):
         database_name = "haystack_integration_test"