Close stdin and stdout after the proc finishes.

ericsnowcurrently · ericsnowcurrently · commit 8cd338def46e · 2017-11-27T17:21:09.000-06:00
diff --git a/Lib/test/test__interpreters.py b/Lib/test/test__interpreters.py
@@ -54,8 +54,8 @@ def test_still_running_at_exit(self):
             time.sleep(1_000_000)
             """)
         filename = script_helper.make_script(self.dirname, 'interp', script)
-        proc = script_helper.spawn_python(filename)
-        retcode = proc.wait()
+        with script_helper.spawn_python(filename) as proc:
+            retcode = proc.wait()
 
         self.assertEqual(retcode, 0)
 
