Issue #9777: test_idna requires the "network" resource

Lib/test/test_socket.py

@@ -642,6 +642,7 @@ class GeneralModuleTests(unittest.TestCase):
         self.assertRaises(socket.error, socket.getnameinfo, ('mail.python.org',0), 0)
 
     def test_idna(self):
+        support.requires('network')
         # these should all be successful
         socket.gethostbyname('испытание.python.org')
         socket.gethostbyname_ex('испытание.python.org')