1# IsolatedAsyncioTestCase based tests
2import asyncio
3import unittest
4
5
6class FutureTests(unittest.IsolatedAsyncioTestCase):
7    async def test_recursive_repr_for_pending_tasks(self):
8        # The call crashes if the guard for recursive call
9        # in base_futures:_future_repr_info is absent
10        # See Also: https://bugs.python.org/issue42183
11
12        async def func():
13            return asyncio.all_tasks()
14
15        # The repr() call should not raise RecursiveError at first.
16        # The check for returned string is not very reliable but
17        # exact comparison for the whole string is even weaker.
18        self.assertIn('...', repr(await asyncio.wait_for(func(), timeout=10)))
19