Support generic mappings in assertion comparison#14482
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Summary
Support rich assertion comparison output for objects implementing
collections.abc.Mapping, not only concretedictinstances.Motivation
_compare_eq_dict()already acceptsMapping[object, object], but thedispatch logic only recognized actual
dictinstances. As a result,custom mapping implementations fell back to generic iterable diff output
instead of the more useful mapping-specific explanation.
Changes
isdict()fromdicttoMappingMappingimplementation that isnot a
dictsubclassTests
python -m pytest testing/test_assertion.py -k Mapping python -m pytest testing/test_assertion.py -k "Mapping or dict"Fixes #14461