Jeremy Audet 722be84cac
Update call to assertDictContainsSubset() (#19122)
`TestCase.assertDictContainsSubset()` was deprecated in Python 3.2,
which went EOL in 2016. Rewrite the assertion to target Python 3.8+.

See: https://docs.python.org/3.2/library/unittest.html#unittest.TestCase.assertDictContainsSubset

See: https://devguide.python.org/versions/
2024-07-13 18:28:26 +08:00
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