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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Support setting the loop_factory in IsolatedAsyncioTestCase","articleBody":"### Proposal:\r\n\r\nI want to be able to create utility subclasses of `IsolatedAsyncioTestCase` that use either uvloop or a specific event loop using the `asyncio.Runner(..., loop_factory=...)` kwarg, Ideally it would look something like:\r\n\r\nAnother advantage of setting `loop_factory` would allow use of `IsolatedAsyncioTestCase` without using  `def tearDownModule(): asyncio.set_event_loop_policy(None)` because `asyncio.Runner` does not call `asyncio.get_event_loop_policy()` when called with a `loop_factory`\r\n\r\n```python\r\nclass DefaultIsolatedAsyncioTestCase:\r\n    \"\"\"\r\n    Use the most efficient event loop regardless of what has been configured with asyncio.set_event_loop_policy\r\n    does not require `def tearDownModule(): asyncio.set_event_loop_policy(None)`\r\n    \"\"\"\r\n    loop_factory = asyncio.EventLoop\r\n```\r\n\r\nor\r\n\r\n```python\r\nclass UvloopIsolatedAsyncioTestCase:\r\n    \"\"\"\r\n    runs tests on uvloop\r\n    \"\"\"\r\n    loop_factory = uvloop.new_event_loop\r\n```\r\n\r\n### Has this already been discussed elsewhere?\r\n\r\nI have already discussed this feature proposal on Discourse\r\n\r\n### Links to previous discussion of this feature:\r\n\r\nhttps://discuss.python.org/t/support-setting-the-loop-factory-in-isolatedasynciotestcase/36027\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-110776\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/graingert","@type":"Person","name":"graingert"},"datePublished":"2023-10-12T15:02:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/110774/cpython/issues/110774"}