[GitHub] [airflow] jhtimmins opened a new pull request #8794: Use fork when test relies on mock.patch in parent process.

[GitBox <gi...@apache.org>]

jhtimmins opened a new pull request #8794:
URL: https://github.com/apache/airflow/pull/8794


   The `test_scheduler_reschedule` method fails when creating processes in `spawn` mode, which is the default mode for Python 3.8 on MacOS. 
   
   `test_scheduler_reschedule` depends on `mock.patch()` decorators around the `.do_schedule()` method in the parent process to mock `DagBag` objects in the child process. Since spawn mode limits the amount of parent state accessible within the child process, `DagBag` is not properly mocked in the new process, causing the test to fail.
   
   This PR forces the test to use `fork` instead of `spawn` when creating a child process, allowing the mocks to work as intended.
   
   ---
   Make sure to mark the boxes below before creating PR: [x]
   
   - [x] Description above provides context of the change
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   - [x] Target Github ISSUE in description if exists
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   - [x] Relevant documentation is updated including usage instructions.
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   ---
   In case of fundamental code change, Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)) is needed.
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