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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Use implemenation-specific I/O open / constructors in tests","articleBody":"# Bug report\n\n### Bug description:\n\nMost I/O tests are setup for running on multiple implementations. As tests have been added for bug fixes some now use `open()` or the class constructor directly instead of the `self.` version which does implementation delegation. This means that some features are not tested when the I/O module implementation is changed (ex. `_io`, `_pyio`).\n\nI'm planning to use this as a meta issue as I find individual cases and update the test, fixing up implementations as needed to get tests passing.\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-133983\n* gh-134165\n* gh-134428\n* gh-134429\n* gh-134433\n* gh-134434\n* gh-135363\n* gh-135364\n* gh-136148\n* gh-136149\n* gh-136218\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/cmaloney","@type":"Person","name":"cmaloney"},"datePublished":"2025-05-13T19:42:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/133982/cpython/issues/133982"}