mirror of https://github.com/python/cpython
180 lines
4.9 KiB
Python
180 lines
4.9 KiB
Python
import asyncio
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import unittest
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from unittest import mock
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from . import utils as test_utils
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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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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))
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asyncio.run(main(True), debug=True)
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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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