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bpo-41543: contextlib.nullcontext can fill in for an async context manager (GH-21870)

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Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>
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Tom Gringauz 2020-11-09 14:34:07 +02:00 • committed by GitHub
parent 97e8b1eaea
commit a117167d8d
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4 changed files with 39 additions and 2 deletions
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14
Lib/test/test_contextlib_async.py
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@ -1,5 +1,7 @@
import asyncio
from contextlib import aclosing, asynccontextmanager, AbstractAsyncContextManager, AsyncExitStack
from contextlib import (
asynccontextmanager, AbstractAsyncContextManager,
AsyncExitStack, nullcontext, aclosing)
import functools
from test import support
import unittest
@ -537,5 +539,15 @@ class TestAsyncExitStack(TestBaseExitStack, unittest.TestCase):
self.assertIsInstance(inner_exc.__context__, ZeroDivisionError)
class TestAsyncNullcontext(unittest.TestCase):
@_async_test
async def test_async_nullcontext(self):
class C:
pass
c = C()
async with nullcontext(c) as c_in:
self.assertIs(c_in, c)
if __name__ == '__main__':
unittest.main()