don't fail tests when www.python.org can't be validated by the system
diff --git a/Lib/test/test_robotparser.py b/Lib/test/test_robotparser.py
index 36ac941..e4b01f1 100644
--- a/Lib/test/test_robotparser.py
+++ b/Lib/test/test_robotparser.py
@@ -276,14 +276,15 @@
             self.assertEqual(parser.can_fetch("*", robots_url), False)
 
     @unittest.skipUnless(HAVE_HTTPS, 'need SSL support to download license')
+    @test_support.system_must_validate_cert
     def testPythonOrg(self):
         test_support.requires('network')
         with test_support.transient_internet('www.python.org'):
             parser = robotparser.RobotFileParser(
-                "http://www.python.org/robots.txt")
+                "https://www.python.org/robots.txt")
             parser.read()
             self.assertTrue(
-                parser.can_fetch("*", "http://www.python.org/robots.txt"))
+                parser.can_fetch("*", "https://www.python.org/robots.txt"))
 
 
 def test_main():