diff --git a/ros2_easy_test/ros2_easy_test/decorators.py b/ros2_easy_test/ros2_easy_test/decorators.py
index 7ed77b8..3b85282 100644
--- a/ros2_easy_test/ros2_easy_test/decorators.py
+++ b/ros2_easy_test/ros2_easy_test/decorators.py
@@ -357,7 +357,9 @@ def wrapper(*args_inner, **kwargs_inner) -> None:
                                 return_code = ros2_process.wait(timeout=shutdown_timeout / 2)
 
                 # Check return codes
-                return_code_problematic = acceptable_return_codes and return_code not in acceptable_return_codes
+                return_code_problematic = (
+                    acceptable_return_codes and return_code not in acceptable_return_codes
+                )
 
                 if return_code_problematic:
                     if test_function_exception is None: