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# IsolatedAsyncioTestCase based tests
import asyncio
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')
@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 RecursiveError at first.
# The check for returned string is not very reliable but
# exact comparison for the whole string is even weaker.
self.assertIn('...', repr(await asyncio.wait_for(func(), timeout=10)))
if __name__ == '__main__':
unittest.main()
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