diff options
Diffstat (limited to 'Lib/test')
| -rw-r--r-- | Lib/test/test_asyncio/test_futures.py | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/Lib/test/test_asyncio/test_futures.py b/Lib/test/test_asyncio/test_futures.py index c566b28..b351740 100644 --- a/Lib/test/test_asyncio/test_futures.py +++ b/Lib/test/test_asyncio/test_futures.py @@ -697,6 +697,24 @@ class CFutureTests(BaseFutureTests, test_utils.TestCase): with self.assertRaises(AttributeError): del fut._log_traceback + def test_callbacks_copy(self): + # See https://github.com/python/cpython/issues/125789 + # In C implementation, the `_callbacks` attribute + # always returns a new list to avoid mutations of internal state + + fut = self._new_future(loop=self.loop) + f1 = lambda _: 1 + f2 = lambda _: 2 + fut.add_done_callback(f1) + fut.add_done_callback(f2) + callbacks = fut._callbacks + self.assertIsNot(callbacks, fut._callbacks) + fut.remove_done_callback(f1) + callbacks = fut._callbacks + self.assertIsNot(callbacks, fut._callbacks) + fut.remove_done_callback(f2) + self.assertIsNone(fut._callbacks) + @unittest.skipUnless(hasattr(futures, '_CFuture'), 'requires the C _asyncio module') |