Fix assertion

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
 

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]

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=(),
     )