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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Mock spec not respected for attributes prefixed with assert","articleBody":"# Bug report\r\n\r\nExample:\r\n\r\n```python \r\nfrom unittest.mock import Mock\r\nclass Foo:\r\n    def assert_something(self):\r\n         pass\r\n\r\nm = Mock(spec=Foo)\r\nm.assert_something()\r\n```\r\n\r\nAn exception is raised:\r\n\r\n```pytb\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"/Users/cklein/github/cklein/cpython/Lib/unittest/mock.py\", line 657, in __getattr__\r\n    raise AttributeError(\r\nAttributeError: 'assert_something' is not a valid assertion. Use a spec for the mock if 'assert_something' is meant to be an attribute.\r\n```\r\n\r\nPython 3.9 and lower:\r\n\r\n```pytb\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/unittest/mock.py\", line 635, in __getattr__\r\n    raise AttributeError(\"Attributes cannot start with 'assert' \"\r\nAttributeError: Attributes cannot start with 'assert' or 'assret'\r\n```\r\n\r\nThe error message suggests that accessing attributes with prefix \"assert_\" should work when using a spec.\r\n\r\nSee https://github.com/cklein/cpython/commit/735ffc4afa02e832441f563f5c551f83c98bade8 for a possible fix\r\n\r\n# Your environment\r\n\r\n- CPython versions tested on:\r\n - 3.12.0a3+\r\n - 3.11.1\r\n - 3.10.9\r\n - 3.9.16\r\n - 3.8.16\r\n - 3.7.16\r\n- Operating system and architecture:\r\n  - Darwin 21.6.0 on arm64\r\n  - Linux 5.4.0-1088-aws on x86_64 (only Python 3.7.5 and 3.8.0)\r\n  \r\n\r\n\u003c!-- gh-linked-prs --\u003e\r\n### Linked PRs\r\n* gh-100740\r\n* gh-100760\n* gh-100761\n\u003c!-- /gh-linked-prs --\u003e\r\n","author":{"url":"https://github.com/cklein","@type":"Person","name":"cklein"},"datePublished":"2023-01-04T07:16:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/100739/cpython/issues/100739"}