bpo-40275: Use new test.support helper submodules in tests (GH-21448)

diff --git a/Lib/test/test_spwd.py b/Lib/test/test_spwd.py
index 07793c8..a143acc 100644
--- a/Lib/test/test_spwd.py
+++ b/Lib/test/test_spwd.py
@@ -1,8 +1,9 @@
 import os
 import unittest
-from test import support
+from test.support import import_helper
 
-spwd = support.import_module('spwd')
+
+spwd = import_helper.import_module('spwd')
 
 
 @unittest.skipUnless(hasattr(os, 'geteuid') and os.geteuid() == 0,