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gh-153581: Fix create_autospec producing an uncallable mock for functools.partialmethod - #153582
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sobolevn
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/cc @ambv Hello, we talked briefly about this bugfix. |
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… functools.partialmethod functools.partialmethod objects have no __call__ of their own (they are non-data descriptors, only callable once resolved through attribute access), so create_autospec's _callable() check treated them as non-callable and forced Klass = NonCallableMagicMock. Autospeccing such an attribute directly (e.g.: mock.patch.object(cls, name, autospec=True)) therefore produced a mock that raised TypeError on every call, even though the real attribute is perfectly callable. _callable() now judges callability from the wrapped function (partialmethod.func) instead. _get_signature_object() gained a matching branch that computes the partialmethod's effective signature, self dropped, the partialmethod's own pre-bound positional/keyword arguments applied, so the resulting mock also enforces the correct call signature rather than accepting anything.
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functools.partialmethodobjects have no__call__of their own (they are non-data descriptors, only callable once resolved through attribute access), socreate_autospec's_callable()check treated them as non-callable and forcedKlass = NonCallableMagicMock. Autospeccing such an attribute directly (e.g.:mock.patch.object(cls, name, autospec=True)) therefore produced a mock that raisedTypeErroron every call, even though the real attribute is perfectly callable._callable()now judges callability from the wrapped function (partialmethod.func) instead._get_signature_object()gained a matching branch that computes thepartialmethod's effective signature, self dropped, thepartialmethod's own pre-bound positional / keyword arguments applied, so the resulting mock also enforces the correct call signature rather than accepting anything.mock.patch(..., autospec=True)on afunctools.partialmethodattribute produces a completely uncallable mock #153581