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66e6a021 - [CI] Remove unittest dependency from `testing_utils.py` (#12621)

[CI] Remove unittest dependency from `testing_utils.py` (#12621) * update * Update tests/testing_utils.py Co-authored-by: Sayak Paul <spsayakpaul@gmail.com> * Update tests/testing_utils.py Co-authored-by: Sayak Paul <spsayakpaul@gmail.com> * Apply style fixes --------- Co-authored-by: Sayak Paul <spsayakpaul@gmail.com> Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>