[issue40909] unittest assertCountEqual doesn't filter on values in dict

[Steven D'Aprano]

Steven D'Aprano <steve+python at pearwood.info> added the comment:

This is working as designed. assertCountEqual is documented here:

https://docs.python.org/3/library/unittest.html#unittest.TestCase.assertCountEqual

It says: "Test that sequence *first* contains the same elements as *second*..." notice that it talks about *sequences*, not mappings. The (approximate) equivalent code is also given:

    assertEqual(Counter(list(first)), Counter(list(second)))

If the arguments are dicts, only the keys are compared. The example you give correctly passes, because it is equivalent to calling `assertCountEqual(first.keys(), second.keys())` and the keys are equal.

If you want to compare the items, you can call `assertCountEqual(first.items(), second.items())`.

The example comparing lists correctly fails because the list elements are different.

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nosy: +steven.daprano
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40909>
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