Issue #1027206: getnameinfo is now restricted to numeric addresses as input.
diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
index 60e5bf7..5a8aa5a 100644
--- a/Lib/test/test_socket.py
+++ b/Lib/test/test_socket.py
@@ -637,6 +637,10 @@
                                flags=socket.AI_PASSIVE)
         self.assertEqual(a, b)
 
+    def test_getnameinfo(self):
+        # only IP addresses are allowed
+        self.assertRaises(socket.error, socket.getnameinfo, ('mail.python.org',0), 0)
+
     def test_idna(self):
         # these should all be successful
         socket.gethostbyname('испытание.python.org')