bpo-39148: enable ipv6 for datagrams in Proactor (GH-19121)

Ifdef is not necessary, as AF_INET6 is supported from Windows Vista, and other code in overlapped.c uses AF_INET6 and is not ifdef'd.
Change the raised exception so users are not fooled to think it comes from Windows API.

Automerge-Triggered-By: @njsmith

1 files changed, 12 insertions, 3 deletions

diff --git a/Lib/test/test_asyncio/test_events.py b/Lib/test/test_asyncio/test_events.py
index aa4daca..573df2d 100644
--- a/Lib/test/test_asyncio/test_events.py
+++ b/Lib/test/test_asyncio/test_events.py
@@ -1208,7 +1208,7 @@ class EventLoopTestsMixin:
             ConnectionRefusedError, client.connect, ('127.0.0.1', port))
         client.close()
 
-    def test_create_datagram_endpoint(self):
+    def _test_create_datagram_endpoint(self, local_addr, family):
         class TestMyDatagramProto(MyDatagramProto):
             def __init__(inner_self):
                 super().__init__(loop=self.loop)
@@ -1218,9 +1218,11 @@ class EventLoopTestsMixin:
                 self.transport.sendto(b'resp:'+data, addr)
 
         coro = self.loop.create_datagram_endpoint(
-            TestMyDatagramProto, local_addr=('127.0.0.1', 0))
+            TestMyDatagramProto, local_addr=local_addr, family=family)
         s_transport, server = self.loop.run_until_complete(coro)
-        host, port = s_transport.get_extra_info('sockname')
+        sockname = s_transport.get_extra_info('sockname')
+        host, port = socket.getnameinfo(
+            sockname, socket.NI_NUMERICHOST|socket.NI_NUMERICSERV)
 
         self.assertIsInstance(s_transport, asyncio.Transport)
         self.assertIsInstance(server, TestMyDatagramProto)
@@ -1254,6 +1256,13 @@ class EventLoopTestsMixin:
         self.assertEqual('CLOSED', client.state)
         server.transport.close()
 
+    def test_create_datagram_endpoint(self):
+        self._test_create_datagram_endpoint(('127.0.0.1', 0), socket.AF_INET)
+
+    @unittest.skipUnless(support.IPV6_ENABLED, 'IPv6 not supported or enabled')
+    def test_create_datagram_endpoint_ipv6(self):
+        self._test_create_datagram_endpoint(('::1', 0), socket.AF_INET6)
+
     def test_create_datagram_endpoint_sock(self):
         sock = None
         local_address = ('127.0.0.1', 0)