From 38ab90217f0a434840b9c48b883ce3ebe6c61869 Mon Sep 17 00:00:00 2001
From: Nuno Campos <nuno@langchain.dev>
Date: Wed, 25 Jun 2025 16:16:38 -0700
Subject: [PATCH] Fix assertion

---
 libs/langgraph/langgraph/pregel/__init__.py | 6 +++---
 libs/langgraph/tests/test_large_cases.py    | 6 +++---
 libs/langgraph/tests/test_pregel_async.py   | 4 +---
 3 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/libs/langgraph/langgraph/pregel/__init__.py b/libs/langgraph/langgraph/pregel/__init__.py
index 3df2bef35..8fe9fed2e 100644
--- a/libs/langgraph/langgraph/pregel/__init__.py
+++ b/libs/langgraph/langgraph/pregel/__init__.py
@@ -219,9 +219,9 @@ class NodeBuilder:
         *channels: str,
     ) -> Self:
         """Adds the specified channels to read from, without subscribing to them."""
-        assert isinstance(
-            self._channels, list
-        ), "Cannot read additional channels when subscribed to single channels"
+        assert isinstance(self._channels, list), (
+            "Cannot read additional channels when subscribed to single channels"
+        )
         self._channels.extend(channels)
         return self
 
diff --git a/libs/langgraph/tests/test_large_cases.py b/libs/langgraph/tests/test_large_cases.py
index ab8752897..cb24702ff 100644
--- a/libs/langgraph/tests/test_large_cases.py
+++ b/libs/langgraph/tests/test_large_cases.py
@@ -1677,9 +1677,9 @@ def test_state_graph_packets(
 
     # Define decision-making logic
     def should_continue(data: dict) -> str:
-        assert (
-            data["something_extra"] == "hi there"
-        ), "nodes can pass extra data to their cond edges, which isn't saved in state"
+        assert data["something_extra"] == "hi there", (
+            "nodes can pass extra data to their cond edges, which isn't saved in state"
+        )
         # Logic to decide whether to continue in the loop or exit
         if tool_calls := data["messages"][-1].tool_calls:
             return [Send("tools", tool_call) for tool_call in tool_calls]
diff --git a/libs/langgraph/tests/test_pregel_async.py b/libs/langgraph/tests/test_pregel_async.py
index b2d75456d..0a0fe58f5 100644
--- a/libs/langgraph/tests/test_pregel_async.py
+++ b/libs/langgraph/tests/test_pregel_async.py
@@ -1042,9 +1042,7 @@ async def test_partial_pending_checkpoint(
             "source": "update",
             "step": 1,
         },
-        parent_config=(
-            [c async for c in tool_two.checkpointer.alist(thread1, limit=2)][-1].config
-        ),
+        parent_config=None,
         interrupts=(),
     )