mik-laj opened a new pull request #4568: [AIRFLOW-3744] Abandon the use of obsolete aliases of methods URL: https://github.com/apache/airflow/pull/4568 Make sure you have checked _all_ steps below. ### Jira - https://issues.apache.org/jira/browse/AIRFLOW-3744 ### Description New versions of Python have marked some methods as obsolete. This change replaces valid calls. https://docs.python.org/3/library/unittest.html#deprecated-aliases ### Tests Not applicable. ### Commits - [ ] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": 1. Subject is separated from body by a blank line 1. Subject is limited to 50 characters (not including Jira issue reference) 1. Subject does not end with a period 1. Subject uses the imperative mood ("add", not "adding") 1. Body wraps at 72 characters 1. Body explains "what" and "why", not "how" ### Documentation Not applicable. ### Code Quality - [X] Passes `flake8`
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