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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"unittest.mock.patch with autospec doesn't hold for classmethods nor staticmethods","articleBody":"# Bug report\r\n\r\nUsing `patch` with `autospec=True` does not work when a method is decorated with `@classmethod` or `@staticmethod`. The resulting mock can be called with any arguments without raising a `TypeError`.\r\n\r\nExample:\r\n```python\r\nfrom unittest.mock import patch\r\nimport pytest\r\n\r\nclass Foo:\r\n    def foo(self):\r\n        pass\r\n    @staticmethod\r\n    def bar():\r\n        pass\r\n    @classmethod\r\n    def baz(cls):\r\n        pass\r\n\r\n@pytest.mark.parametrize(\"method\", [\"foo\", \"bar\", \"baz\"])\r\ndef test_foo(method: str):\r\n    with patch.object(Foo, method, autospec=True):\r\n        getattr(Foo(), method)(5)\r\n```\r\n\r\nThe only subtest that fails is `foo`. The other two pass, even though they're clearly being called incorrectly.\r\n\r\nIf you prefer not to use `pytest` to demo/repro this:\r\n\r\n```python\r\nwith patch.object(Foo, \"foo\", autospec=True):\r\n    try:\r\n        Foo().foo(5)\r\n    except TypeError:\r\n        print(\"Correctly raises on foo\")\r\n    else:\r\n        print(\"Incorrectly does not raise with foo\")\r\n\r\nwith patch.object(Foo, \"bar\", autospec=True):\r\n    try:\r\n        Foo().bar(5)\r\n    except TypeError:\r\n        print(\"Correctly raises on bar\")\r\n    else:\r\n        print(\"Incorrectly does not raise with bar\")\r\n\r\nwith patch.object(Foo, \"baz\", autospec=True):\r\n    try:\r\n        Foo().baz(5)\r\n    except TypeError:\r\n        print(\"Correctly raises on baz\")\r\n    else:\r\n        print(\"Incorrectly does not raise with baz\")\r\n```\r\n\r\nThis has output:\r\n```\r\nCorrectly raises on foo\r\nIncorrectly does not raise with bar\r\nIncorrectly does not raise with baz\r\n```\r\n\r\n# Your environment\r\n\r\n- CPython versions tested on: 3.10, 3.11\r\n- Operating system and architecture: macOS 12.6 with Apple M1 chip\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-103228\n* gh-103499\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/rileyjohngibbs","@type":"Person","name":"rileyjohngibbs"},"datePublished":"2023-03-23T21:52:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/102978/cpython/issues/102978"}