diff --git a/api/tests/unit_tests/services/test_metadata_nullable_bug.py b/api/tests/unit_tests/services/test_metadata_nullable_bug.py
index cfd3d034df2..af898f3cb4a 100644
--- a/api/tests/unit_tests/services/test_metadata_nullable_bug.py
+++ b/api/tests/unit_tests/services/test_metadata_nullable_bug.py
@@ -2,11 +2,17 @@ from typing import cast
 from unittest.mock import Mock
 
 import pytest
+from sqlalchemy.orm import Session
 
 from models import Account, Tenant
 from services.entities.knowledge_entities.knowledge_entities import MetadataArgs
 from services.metadata_service import MetadataService
 
+pytestmark = [
+    pytest.mark.usefixtures("sqlite_session"),
+    pytest.mark.parametrize("sqlite_session", [()], indirect=True),
+]
+
 
 def _make_account(account_id: str = "user-456", tenant_id: str = "tenant-123") -> Account:
     account = Account(name="Test User", email=f"{account_id}@example.com")
@@ -27,7 +33,7 @@ class TestMetadataNullableBug:
             # This should fail because Pydantic expects non-None values
             MetadataArgs(type=None, name=None)  # pyrefly: ignore[bad-argument-type]
 
-    def test_metadata_service_create_with_none_name_crashes(self) -> None:
+    def test_metadata_service_create_with_none_name_crashes(self, sqlite_session: Session) -> None:
         """Test that MetadataService.create_metadata crashes when name is None."""
         # Mock the MetadataArgs to bypass Pydantic validation
         mock_metadata_args = Mock()
@@ -37,17 +43,21 @@ class TestMetadataNullableBug:
         account = _make_account()
         # This should crash with TypeError when calling len(None)
         with pytest.raises(TypeError, match="object of type 'NoneType' has no len"):
-            MetadataService.create_metadata("dataset-123", mock_metadata_args, account, "tenant-123", session=Mock())
+            MetadataService.create_metadata(
+                "dataset-123", mock_metadata_args, account, "tenant-123", session=sqlite_session
+            )
+        assert not sqlite_session.in_transaction()
 
-    def test_metadata_service_update_with_none_name_crashes(self) -> None:
+    def test_metadata_service_update_with_none_name_crashes(self, sqlite_session: Session) -> None:
         """Test that MetadataService.update_metadata_name crashes when name is None."""
         account = _make_account()
         none_name = cast(str, None)
         # This should crash with TypeError when calling len(None)
         with pytest.raises(TypeError, match="object of type 'NoneType' has no len"):
             MetadataService.update_metadata_name(
-                "dataset-123", "metadata-456", none_name, account, "tenant-123", session=Mock()
+                "dataset-123", "metadata-456", none_name, account, "tenant-123", session=sqlite_session
             )
+        assert not sqlite_session.in_transaction()
 
     def test_api_layer_now_uses_pydantic_validation(self) -> None:
         """Verify that API layer relies on Pydantic validation instead of reqparse."""