bpo-29703: asyncio: Fix creating new event loops in child processes. (#404)

1 files changed, 22 insertions, 0 deletions

diff --git a/Lib/test/test_asyncio/test_events.py b/Lib/test/test_asyncio/test_events.py
index 28d92a9..802763b 100644
--- a/Lib/test/test_asyncio/test_events.py
+++ b/Lib/test/test_asyncio/test_events.py
@@ -1,6 +1,7 @@
 """Tests for events.py."""
 
 import collections.abc
+import concurrent.futures
 import functools
 import gc
 import io
@@ -57,6 +58,15 @@ def osx_tiger():
     return version < (10, 5)
 
 
+def _test_get_event_loop_new_process__sub_proc():
+    async def doit():
+        return 'hello'
+
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+    return loop.run_until_complete(doit())
+
+
 ONLYCERT = data_file('ssl_cert.pem')
 ONLYKEY = data_file('ssl_key.pem')
 SIGNED_CERTFILE = data_file('keycert3.pem')
@@ -2181,6 +2191,18 @@ else:
             asyncio.set_child_watcher(None)
             super().tearDown()
 
+        def test_get_event_loop_new_process(self):
+            async def main():
+                pool = concurrent.futures.ProcessPoolExecutor()
+                return await self.loop.run_in_executor(
+                    pool, _test_get_event_loop_new_process__sub_proc)
+
+            self.unpatch_get_running_loop()
+
+            self.assertEqual(
+                self.loop.run_until_complete(main()),
+                'hello')
+
     if hasattr(selectors, 'KqueueSelector'):
         class KqueueEventLoopTests(UnixEventLoopTestsMixin,
                                    SubprocessTestsMixin,