Issue #21163: BaseEventLoop.run_until_complete() and test_utils.run_briefly()
don't log the "destroy pending task" message anymore. The log is redundant for
run_until_complete() and useless in run_briefly().
diff --git a/Lib/asyncio/test_utils.py b/Lib/asyncio/test_utils.py
index 94054e7..ef3be23 100644
--- a/Lib/asyncio/test_utils.py
+++ b/Lib/asyncio/test_utils.py
@@ -49,6 +49,9 @@
         pass
     gen = once()
     t = tasks.Task(gen, loop=loop)
+    # Don't log a warning if the task is not done after run_until_complete().
+    # It occurs if the loop is stopped or if a task raises a BaseException.
+    t._log_destroy_pending = False
     try:
         loop.run_until_complete(t)
     finally: