From e332869a0cecbb32db0a4d1df417c44d90ea2edb Mon Sep 17 00:00:00 2001
From: William FH <13333726+hinthornw@users.noreply.github.com>
Date: Mon, 30 Sep 2024 09:54:47 -0700
Subject: [PATCH] Ensure configurable (#1912)

---
 libs/langgraph/langgraph/utils/config.py |  2 ++
 libs/langgraph/tests/test_runnable.py    | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/libs/langgraph/langgraph/utils/config.py b/libs/langgraph/langgraph/utils/config.py
index 6f75c64ba..3993df9b2 100644
--- a/libs/langgraph/langgraph/utils/config.py
+++ b/libs/langgraph/langgraph/utils/config.py
@@ -120,6 +120,8 @@ def merge_configs(*configs: Optional[RunnableConfig]) -> RunnableConfig:
                     base["recursion_limit"] = config["recursion_limit"]
             else:
                 base[key] = config[key]  # type: ignore[literal-required]
+    if CONF not in base:
+        base[CONF] = {}
     return base
 
 
diff --git a/libs/langgraph/tests/test_runnable.py b/libs/langgraph/tests/test_runnable.py
index 64d858fd4..2bd2e20d5 100644
--- a/libs/langgraph/tests/test_runnable.py
+++ b/libs/langgraph/tests/test_runnable.py
@@ -41,3 +41,21 @@ async def afunc_with_writer(x: Any, writer: StreamWriter) -> str:
     for name, runnable in runnables.items():
         assert runnable.func_accepts["writer"] == expected_writer.get(name, False)
         assert runnable.func_accepts["store"] == expected_store.get(name, False)
+
+
+async def test_runnable_callable_basic():
+    def sync_func(x: Any) -> str:
+        return f"{x}"
+
+    async def async_func(x: Any) -> str:
+        return f"{x}"
+
+    runnable_sync = RunnableCallable(sync_func)
+    runnable_async = RunnableCallable(func=None, afunc=async_func)
+
+    result_sync = runnable_sync.invoke("test")
+    assert result_sync == "test"
+
+    # Test asynchronous ainvoke
+    result_async = await runnable_async.ainvoke("test")
+    assert result_async == "test"