asyncio: Fix warning in test_close_kill_running()

Read process exit status to avoid the "Caught subprocess termination from
unknown pid" message.

diff --git a/Lib/test/test_asyncio/test_subprocess.py b/Lib/test/test_asyncio/test_subprocess.py
index 92bf1b45edf0373b74f7389105c8f0b0ad264c9b..5ccdafb151f6871b61dc7e0736090b2be9790760 100644 (file)
--- a/Lib/test/test_asyncio/test_subprocess.py
+++ b/Lib/test/test_asyncio/test_subprocess.py
@@ -367,6 +367,7 @@ class SubprocessMixin:
             proc.kill = kill
             returncode = transport.get_returncode()
             transport.close()
+            yield from transport._wait()
             return (returncode, kill_called)
 
         # Ignore "Close running child process: kill ..." log