mirror of https://github.com/python/cpython
519 lines
15 KiB
Python
519 lines
15 KiB
Python
import _thread
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import asyncio
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import contextvars
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import re
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import signal
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import sys
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import threading
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import unittest
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from test.test_asyncio import utils as test_utils
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from unittest import mock
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from unittest.mock import patch
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def tearDownModule():
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asyncio.set_event_loop_policy(None)
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def interrupt_self():
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_thread.interrupt_main()
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class TestPolicy(asyncio.AbstractEventLoopPolicy):
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def __init__(self, loop_factory):
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self.loop_factory = loop_factory
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self.loop = None
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def get_event_loop(self):
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# shouldn't ever be called by asyncio.run()
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raise RuntimeError
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def new_event_loop(self):
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return self.loop_factory()
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def set_event_loop(self, loop):
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if loop is not None:
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# we want to check if the loop is closed
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# in BaseTest.tearDown
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self.loop = loop
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class BaseTest(unittest.TestCase):
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def new_loop(self):
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loop = asyncio.BaseEventLoop()
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loop._process_events = mock.Mock()
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# Mock waking event loop from select
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loop._write_to_self = mock.Mock()
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loop._write_to_self.return_value = None
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loop._selector = mock.Mock()
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loop._selector.select.return_value = ()
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loop.shutdown_ag_run = False
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async def shutdown_asyncgens():
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loop.shutdown_ag_run = True
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loop.shutdown_asyncgens = shutdown_asyncgens
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return loop
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def setUp(self):
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super().setUp()
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policy = TestPolicy(self.new_loop)
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asyncio.set_event_loop_policy(policy)
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def tearDown(self):
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policy = asyncio.get_event_loop_policy()
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if policy.loop is not None:
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self.assertTrue(policy.loop.is_closed())
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self.assertTrue(policy.loop.shutdown_ag_run)
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asyncio.set_event_loop_policy(None)
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super().tearDown()
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class RunTests(BaseTest):
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def test_asyncio_run_return(self):
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async def main():
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await asyncio.sleep(0)
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return 42
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self.assertEqual(asyncio.run(main()), 42)
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def test_asyncio_run_raises(self):
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async def main():
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await asyncio.sleep(0)
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raise ValueError('spam')
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with self.assertRaisesRegex(ValueError, 'spam'):
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asyncio.run(main())
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def test_asyncio_run_only_coro(self):
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for o in {1, lambda: None}:
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with self.subTest(obj=o), \
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self.assertRaisesRegex(ValueError,
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'a coroutine was expected'):
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asyncio.run(o)
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def test_asyncio_run_debug(self):
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async def main(expected):
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loop = asyncio.get_event_loop()
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self.assertIs(loop.get_debug(), expected)
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asyncio.run(main(False), debug=False)
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asyncio.run(main(True), debug=True)
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with mock.patch('asyncio.coroutines._is_debug_mode', lambda: True):
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asyncio.run(main(True))
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asyncio.run(main(False), debug=False)
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with mock.patch('asyncio.coroutines._is_debug_mode', lambda: False):
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asyncio.run(main(True), debug=True)
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asyncio.run(main(False))
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def test_asyncio_run_from_running_loop(self):
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async def main():
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coro = main()
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try:
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asyncio.run(coro)
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finally:
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coro.close() # Suppress ResourceWarning
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with self.assertRaisesRegex(RuntimeError,
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'cannot be called from a running'):
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asyncio.run(main())
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def test_asyncio_run_cancels_hanging_tasks(self):
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lo_task = None
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async def leftover():
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await asyncio.sleep(0.1)
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async def main():
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nonlocal lo_task
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lo_task = asyncio.create_task(leftover())
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return 123
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self.assertEqual(asyncio.run(main()), 123)
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self.assertTrue(lo_task.done())
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def test_asyncio_run_reports_hanging_tasks_errors(self):
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lo_task = None
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call_exc_handler_mock = mock.Mock()
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async def leftover():
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try:
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await asyncio.sleep(0.1)
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except asyncio.CancelledError:
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1 / 0
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async def main():
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loop = asyncio.get_running_loop()
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loop.call_exception_handler = call_exc_handler_mock
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nonlocal lo_task
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lo_task = asyncio.create_task(leftover())
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return 123
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self.assertEqual(asyncio.run(main()), 123)
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self.assertTrue(lo_task.done())
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call_exc_handler_mock.assert_called_with({
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'message': test_utils.MockPattern(r'asyncio.run.*shutdown'),
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'task': lo_task,
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'exception': test_utils.MockInstanceOf(ZeroDivisionError)
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})
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def test_asyncio_run_closes_gens_after_hanging_tasks_errors(self):
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spinner = None
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lazyboy = None
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class FancyExit(Exception):
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pass
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async def fidget():
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while True:
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yield 1
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await asyncio.sleep(1)
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async def spin():
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nonlocal spinner
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spinner = fidget()
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try:
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async for the_meaning_of_life in spinner: # NoQA
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pass
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except asyncio.CancelledError:
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1 / 0
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async def main():
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loop = asyncio.get_running_loop()
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loop.call_exception_handler = mock.Mock()
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nonlocal lazyboy
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lazyboy = asyncio.create_task(spin())
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raise FancyExit
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with self.assertRaises(FancyExit):
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asyncio.run(main())
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self.assertTrue(lazyboy.done())
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self.assertIsNone(spinner.ag_frame)
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self.assertFalse(spinner.ag_running)
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def test_asyncio_run_set_event_loop(self):
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#See https://github.com/python/cpython/issues/93896
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async def main():
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await asyncio.sleep(0)
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return 42
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policy = asyncio.get_event_loop_policy()
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policy.set_event_loop = mock.Mock()
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asyncio.run(main())
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self.assertTrue(policy.set_event_loop.called)
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def test_asyncio_run_without_uncancel(self):
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# See https://github.com/python/cpython/issues/95097
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class Task:
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def __init__(self, loop, coro, **kwargs):
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self._task = asyncio.Task(coro, loop=loop, **kwargs)
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def cancel(self, *args, **kwargs):
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return self._task.cancel(*args, **kwargs)
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def add_done_callback(self, *args, **kwargs):
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return self._task.add_done_callback(*args, **kwargs)
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def remove_done_callback(self, *args, **kwargs):
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return self._task.remove_done_callback(*args, **kwargs)
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@property
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def _asyncio_future_blocking(self):
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return self._task._asyncio_future_blocking
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def result(self, *args, **kwargs):
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return self._task.result(*args, **kwargs)
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def done(self, *args, **kwargs):
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return self._task.done(*args, **kwargs)
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def cancelled(self, *args, **kwargs):
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return self._task.cancelled(*args, **kwargs)
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def exception(self, *args, **kwargs):
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return self._task.exception(*args, **kwargs)
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def get_loop(self, *args, **kwargs):
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return self._task.get_loop(*args, **kwargs)
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def set_name(self, *args, **kwargs):
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return self._task.set_name(*args, **kwargs)
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async def main():
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interrupt_self()
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await asyncio.Event().wait()
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def new_event_loop():
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loop = self.new_loop()
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loop.set_task_factory(Task)
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return loop
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asyncio.set_event_loop_policy(TestPolicy(new_event_loop))
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with self.assertRaises(asyncio.CancelledError):
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asyncio.run(main())
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def test_asyncio_run_loop_factory(self):
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factory = mock.Mock()
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loop = factory.return_value = self.new_loop()
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async def main():
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self.assertEqual(asyncio.get_running_loop(), loop)
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asyncio.run(main(), loop_factory=factory)
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factory.assert_called_once_with()
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def test_loop_factory_default_event_loop(self):
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async def main():
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if sys.platform == "win32":
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self.assertIsInstance(asyncio.get_running_loop(), asyncio.ProactorEventLoop)
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else:
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self.assertIsInstance(asyncio.get_running_loop(), asyncio.SelectorEventLoop)
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asyncio.run(main(), loop_factory=asyncio.EventLoop)
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class RunnerTests(BaseTest):
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def test_non_debug(self):
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with asyncio.Runner(debug=False) as runner:
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self.assertFalse(runner.get_loop().get_debug())
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def test_debug(self):
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with asyncio.Runner(debug=True) as runner:
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self.assertTrue(runner.get_loop().get_debug())
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def test_custom_factory(self):
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loop = mock.Mock()
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with asyncio.Runner(loop_factory=lambda: loop) as runner:
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self.assertIs(runner.get_loop(), loop)
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def test_run(self):
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async def f():
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await asyncio.sleep(0)
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return 'done'
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with asyncio.Runner() as runner:
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self.assertEqual('done', runner.run(f()))
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loop = runner.get_loop()
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with self.assertRaisesRegex(
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RuntimeError,
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"Runner is closed"
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):
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runner.get_loop()
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self.assertTrue(loop.is_closed())
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def test_run_non_coro(self):
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with asyncio.Runner() as runner:
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with self.assertRaisesRegex(
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ValueError,
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"a coroutine was expected"
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):
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runner.run(123)
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def test_run_future(self):
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with asyncio.Runner() as runner:
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with self.assertRaisesRegex(
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ValueError,
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"a coroutine was expected"
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):
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fut = runner.get_loop().create_future()
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runner.run(fut)
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def test_explicit_close(self):
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runner = asyncio.Runner()
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loop = runner.get_loop()
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runner.close()
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with self.assertRaisesRegex(
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RuntimeError,
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"Runner is closed"
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):
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runner.get_loop()
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self.assertTrue(loop.is_closed())
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def test_double_close(self):
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runner = asyncio.Runner()
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loop = runner.get_loop()
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runner.close()
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self.assertTrue(loop.is_closed())
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# the second call is no-op
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runner.close()
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self.assertTrue(loop.is_closed())
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def test_second_with_block_raises(self):
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ret = []
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async def f(arg):
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ret.append(arg)
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runner = asyncio.Runner()
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with runner:
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runner.run(f(1))
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with self.assertRaisesRegex(
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RuntimeError,
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"Runner is closed"
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):
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with runner:
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runner.run(f(2))
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self.assertEqual([1], ret)
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def test_run_keeps_context(self):
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cvar = contextvars.ContextVar("cvar", default=-1)
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async def f(val):
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old = cvar.get()
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await asyncio.sleep(0)
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cvar.set(val)
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return old
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async def get_context():
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return contextvars.copy_context()
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with asyncio.Runner() as runner:
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self.assertEqual(-1, runner.run(f(1)))
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self.assertEqual(1, runner.run(f(2)))
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self.assertEqual(2, runner.run(get_context()).get(cvar))
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def test_recursive_run(self):
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async def g():
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pass
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async def f():
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runner.run(g())
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with asyncio.Runner() as runner:
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with self.assertWarnsRegex(
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RuntimeWarning,
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"coroutine .+ was never awaited",
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):
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with self.assertRaisesRegex(
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RuntimeError,
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re.escape(
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"Runner.run() cannot be called from a running event loop"
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),
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):
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runner.run(f())
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def test_interrupt_call_soon(self):
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# The only case when task is not suspended by waiting a future
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# or another task
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assert threading.current_thread() is threading.main_thread()
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async def coro():
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with self.assertRaises(asyncio.CancelledError):
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while True:
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await asyncio.sleep(0)
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raise asyncio.CancelledError()
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with asyncio.Runner() as runner:
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runner.get_loop().call_later(0.1, interrupt_self)
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with self.assertRaises(KeyboardInterrupt):
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runner.run(coro())
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def test_interrupt_wait(self):
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# interrupting when waiting a future cancels both future and main task
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assert threading.current_thread() is threading.main_thread()
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async def coro(fut):
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with self.assertRaises(asyncio.CancelledError):
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await fut
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raise asyncio.CancelledError()
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with asyncio.Runner() as runner:
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fut = runner.get_loop().create_future()
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runner.get_loop().call_later(0.1, interrupt_self)
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with self.assertRaises(KeyboardInterrupt):
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runner.run(coro(fut))
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self.assertTrue(fut.cancelled())
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def test_interrupt_cancelled_task(self):
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# interrupting cancelled main task doesn't raise KeyboardInterrupt
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assert threading.current_thread() is threading.main_thread()
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async def subtask(task):
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await asyncio.sleep(0)
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task.cancel()
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interrupt_self()
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async def coro():
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asyncio.create_task(subtask(asyncio.current_task()))
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await asyncio.sleep(10)
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with asyncio.Runner() as runner:
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with self.assertRaises(asyncio.CancelledError):
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runner.run(coro())
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def test_signal_install_not_supported_ok(self):
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# signal.signal() can throw if the "main thread" doesn't have signals enabled
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assert threading.current_thread() is threading.main_thread()
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async def coro():
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pass
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with asyncio.Runner() as runner:
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with patch.object(
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signal,
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"signal",
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side_effect=ValueError(
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"signal only works in main thread of the main interpreter"
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)
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):
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runner.run(coro())
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def test_set_event_loop_called_once(self):
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# See https://github.com/python/cpython/issues/95736
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async def coro():
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pass
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policy = asyncio.get_event_loop_policy()
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policy.set_event_loop = mock.Mock()
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runner = asyncio.Runner()
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runner.run(coro())
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runner.run(coro())
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self.assertEqual(1, policy.set_event_loop.call_count)
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runner.close()
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def test_no_repr_is_call_on_the_task_result(self):
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# See https://github.com/python/cpython/issues/112559.
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class MyResult:
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def __init__(self):
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self.repr_count = 0
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def __repr__(self):
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self.repr_count += 1
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return super().__repr__()
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async def coro():
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return MyResult()
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with asyncio.Runner() as runner:
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result = runner.run(coro())
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self.assertEqual(0, result.repr_count)
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if __name__ == '__main__':
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unittest.main()
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