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# IsolatedAsyncioTestCase based tests
import asyncio
import contextvars
import traceback
import unittest
from asyncio import tasks
def tearDownModule():
asyncio.set_event_loop_policy(None)
class FutureTests:
async def test_future_traceback(self):
async def raise_exc():
raise TypeError(42)
future = self.cls(raise_exc())
for _ in range(5):
try:
await future
except TypeError as e:
tb = ''.join(traceback.format_tb(e.__traceback__))
self.assertEqual(tb.count("await future"), 1)
else:
self.fail('TypeError was not raised')
async def test_task_exc_handler_correct_context(self):
# see https://github.com/python/cpython/issues/96704
name = contextvars.ContextVar('name', default='foo')
exc_handler_called = False
def exc_handler(*args):
self.assertEqual(name.get(), 'bar')
nonlocal exc_handler_called
exc_handler_called = True
async def task():
name.set('bar')
1/0
loop = asyncio.get_running_loop()
loop.set_exception_handler(exc_handler)
self.cls(task())
await asyncio.sleep(0)
self.assertTrue(exc_handler_called)
async def test_handle_exc_handler_correct_context(self):
# see https://github.com/python/cpython/issues/96704
name = contextvars.ContextVar('name', default='foo')
exc_handler_called = False
def exc_handler(*args):
self.assertEqual(name.get(), 'bar')
nonlocal exc_handler_called
exc_handler_called = True
def callback():
name.set('bar')
1/0
loop = asyncio.get_running_loop()
loop.set_exception_handler(exc_handler)
loop.call_soon(callback)
await asyncio.sleep(0)
self.assertTrue(exc_handler_called)
@unittest.skipUnless(hasattr(tasks, '_CTask'),
'requires the C _asyncio module')
class CFutureTests(FutureTests, unittest.IsolatedAsyncioTestCase):
cls = tasks._CTask
class PyFutureTests(FutureTests, unittest.IsolatedAsyncioTestCase):
cls = tasks._PyTask
class FutureReprTests(unittest.IsolatedAsyncioTestCase):
async def test_recursive_repr_for_pending_tasks(self):
# The call crashes if the guard for recursive call
# in base_futures:_future_repr_info is absent
# See Also: https://bugs.python.org/issue42183
async def func():
return asyncio.all_tasks()
# The repr() call should not raise RecursionError at first.
waiter = await asyncio.wait_for(asyncio.Task(func()),timeout=10)
self.assertIn('...', repr(waiter))
if __name__ == '__main__':
unittest.main()