diff --git a/libs/core/tests/unit_tests/runnables/test_config.py b/libs/core/tests/unit_tests/runnables/test_config.py
index e2a5993c999..fd9d0ebffb8 100644
--- a/libs/core/tests/unit_tests/runnables/test_config.py
+++ b/libs/core/tests/unit_tests/runnables/test_config.py
@@ -235,7 +235,9 @@ def test_inherit_run_name_with_chain() -> None:
     captured_names: list[str] = []
 
     class TestCallbackHandler(BaseCallbackHandler):
-        def on_chain_start(self, _serialized: dict, _inputs: Any, **kwargs: Any) -> None:
+        def on_chain_start(
+            self, _serialized: dict, _inputs: Any, **kwargs: Any
+        ) -> None:
             name = kwargs.get("name", "unnamed")
             captured_names.append(name)
 
@@ -286,7 +288,7 @@ def test_inherit_run_name_with_chain() -> None:
 
 def test_inherit_run_name_with_override() -> None:
     """Test that per-step with_config can still set different run_names.
-    
+
     Verifies that when inherit_run_name is NOT used, the traditional behavior
     of setting different run_names per step via with_config still works.
     """
@@ -297,7 +299,9 @@ def test_inherit_run_name_with_override() -> None:
     captured_names: list[str] = []
 
     class TestCallbackHandler(BaseCallbackHandler):
-        def on_chain_start(self, _serialized: dict, _inputs: Any, **kwargs: Any) -> None:
+        def on_chain_start(
+            self, _serialized: dict, _inputs: Any, **kwargs: Any
+        ) -> None:
             name = kwargs.get("name", "unnamed")
             captured_names.append(name)
 
@@ -366,8 +370,3 @@ def test_inherit_run_name_merge_configs() -> None:
         "inherit_run_name should pass through ensure_config"
     )
     assert ensured.get("run_name") == "test_run", "run_name should be preserved"
-
-
-
-
-