[New-bugs-announce] [issue25669] unittest.assertEqual() on un-equal types inheriting from collections.Mapping

[Nathan Herring]

New submission from Nathan Herring:

We have some code that generates objects that inherit from Mapping that are not nearly as straightforward to instantiate in a test. It's much easier to have something like the follows:

foo = … # some collections.Mapping subtype
self.assertEqual({'key': 'value'}, foo)

unittest/case.py's _baseAssertEqual will print out both sides and let me do visual inspection, but I'd prefer it if it knew both sides supported Mapping and in the != case, performed an analog of assertDictEqual so I could just get the keys/values that were mismatched, especially in the cases of large dictionaries.

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components: Tests
messages: 254902
nosy: Nathan Herring
priority: normal
severity: normal
status: open
title: unittest.assertEqual() on un-equal types inheriting from collections.Mapping
type: enhancement
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25669>
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