asyncio_test: Remove obsolete cleanup logic

Per comments, we needed to set and restore the event loop policy
in Python 3.4, but it no longer seems to be necessary (and
raises DeprecationWarnings in Python 3.14).

diff --git a/tornado/test/asyncio_test.py b/tornado/test/asyncio_test.py
index bb6416a549f3dfb8e9f084087de10cebd3faa246..3c865aae5fda1ee1cfa110d7e76488c20d70ae71 100644 (file)
--- a/tornado/test/asyncio_test.py
+++ b/tornado/test/asyncio_test.py
@@ -111,10 +111,6 @@ class LeakTest(unittest.TestCase):
     def setUp(self):
         # Trigger a cleanup of the mapping so we start with a clean slate.
         AsyncIOLoop(make_current=False).close()
-        # If we don't clean up after ourselves other tests may fail on
-        # py34.
-        self.orig_policy = asyncio.get_event_loop_policy()
-        asyncio.set_event_loop_policy(asyncio.DefaultEventLoopPolicy())
 
     def tearDown(self):
         try:
@@ -124,7 +120,6 @@ class LeakTest(unittest.TestCase):
             pass
         else:
             loop.close()
-        asyncio.set_event_loop_policy(self.orig_policy)
 
     def test_ioloop_close_leak(self):
         orig_count = len(IOLoop._ioloop_for_asyncio)