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bpo-29922: Improve error messages in 'async with' (GH-6352)

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when __aenter__() or __aexit__() return non-awaitable object.
(cherry picked from commit a68f2f0578)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Miss Islington (bot) 2018-04-04 07:09:00 -07:00 • committed by GitHub
parent b8fc2d6580
commit fcd4e03e08
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3 changed files with 36 additions and 4 deletions
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13
Lib/test/test_coroutines.py
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@ -1255,7 +1255,9 @@ class CoroutineTest(unittest.TestCase):
pass
with self.assertRaisesRegex(
TypeError, "object int can't be used in 'await' expression"):
TypeError,
"'async with' received an object from __aenter__ "
"that does not implement __await__: int"):
# it's important that __aexit__ wasn't called
run_async(foo())
@ -1275,7 +1277,9 @@ class CoroutineTest(unittest.TestCase):
run_async(foo())
except TypeError as exc:
self.assertRegex(
exc.args[0], "object int can't be used in 'await' expression")
exc.args[0],
"'async with' received an object from __aexit__ "
"that does not implement __await__: int")
self.assertTrue(exc.__context__ is not None)
self.assertTrue(isinstance(exc.__context__, ZeroDivisionError))
else:
@ -1299,8 +1303,9 @@ class CoroutineTest(unittest.TestCase):
with self.assertRaisesRegex(
TypeError, "object int can't be used in 'await' expression"):
TypeError,
"'async with' received an object from __aexit__ "
"that does not implement __await__: int"):
run_async(foo())
self.assertEqual(CNT, 1)