Fix test_run_until_complete_loop_orphan_future_close_loop

Author: 1st1

Lib/test/test_asyncio/test_base_events.py

@@ -476,7 +476,7 @@ def test_run_until_complete_loop(self):
             other_loop.run_until_complete, task)
 
     def test_run_until_complete_loop_orphan_future_close_loop(self):
-        class ShowStopper(BaseException):
+        class ShowStopper(SystemExit):
             pass
 
         async def foo(delay):
@@ -487,10 +487,8 @@ def throw():
 
         self.loop._process_events = mock.Mock()
         self.loop.call_soon(throw)
-        try:
+        with self.assertRaises(ShowStopper):
             self.loop.run_until_complete(foo(0.1))
-        except ShowStopper:
-            pass
 
         # This call fails if run_until_complete does not clean up
         # done-callback for the previous future.