diff --git a/libs/checkpoint/tests/test_memory.py b/libs/checkpoint/tests/test_memory.py
index 16de77aca..617b23f68 100644
--- a/libs/checkpoint/tests/test_memory.py
+++ b/libs/checkpoint/tests/test_memory.py
@@ -663,4 +663,3 @@ class TestPreDeltaBlobTerminator:
         assert "PRE-DELTA-WRITE" not in values
         # And the pending write at the target is never folded in.
         assert "PENDING-AT-TARGET" not in values
-
diff --git a/libs/langgraph/tests/test_delta_channel_migration.py b/libs/langgraph/tests/test_delta_channel_migration.py
index 46fdc0658..245ba2561 100644
--- a/libs/langgraph/tests/test_delta_channel_migration.py
+++ b/libs/langgraph/tests/test_delta_channel_migration.py
@@ -593,7 +593,9 @@ def test_add_messages_to_delta_migration_preserves_message_history() -> None:
     )
 
 
-async def test_add_messages_to_delta_migration_preserves_message_history_async() -> None:
+async def test_add_messages_to_delta_migration_preserves_message_history_async() -> (
+    None
+):
     """Async variant of the add_messages migration test."""
     checkpointer = InMemorySaver()
     config = {"configurable": {"thread_id": "add-messages-migration-async"}}
@@ -602,9 +604,7 @@ async def test_add_messages_to_delta_migration_preserves_message_history_async()
     await pre_graph.ainvoke(
         {"messages": [HumanMessage(content="hello", id="h1")]}, config
     )
-    await pre_graph.ainvoke(
-        {"messages": [AIMessage(content="hi", id="a1")]}, config
-    )
+    await pre_graph.ainvoke({"messages": [AIMessage(content="hi", id="a1")]}, config)
 
     delta_graph = _delta_messages_graph(checkpointer)
     snap = await delta_graph.aget_state(config)