sarutak commented on a change in pull request #7128: [AIRFLOW-6529] Pickle 
error occurs when the scheduler tries to run on macOS.
URL: https://github.com/apache/airflow/pull/7128#discussion_r366431089
 
 

 ##########
 File path: tests/test_utils/mock_executor.py
 ##########
 @@ -36,10 +36,17 @@ def __init__(self, do_update=True, *args, **kwargs):
         self.history = []
         # All the tasks, in a stable sort order
         self.sorted_tasks = []
-        self.mock_task_results = defaultdict(lambda: State.SUCCESS)
+
+        # If multiprocessing runs in spawn mode,
+        # arguments are to be pickled but lambda is not picclable.
+        # So we should pass self.success instead of lambda.
 
 Review comment:
   OK. I've added new CI entries in .travis.yml.
   Waiting for all tests pass...

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