bpo-40275: Avoid importing socket in test.support (GH-19603)

* Move socket related functions from test.support to socket_helper.
* Import socket, nntplib and urllib.error lazily in transient_internet().
* Remove importing multiprocess.

1 files changed, 7 insertions, 6 deletions

diff --git a/Lib/test/test_asyncore.py b/Lib/test/test_asyncore.py
index 6c84ac4..3c3abe4 100644
--- a/Lib/test/test_asyncore.py
+++ b/Lib/test/test_asyncore.py
@@ -10,6 +10,7 @@ import struct
 import threading
 
 from test import support
+from test.support import socket_helper
 from io import BytesIO
 
 if support.PGO:
@@ -91,7 +92,7 @@ def bind_af_aware(sock, addr):
     if HAS_UNIX_SOCKETS and sock.family == socket.AF_UNIX:
         # Make sure the path doesn't exist.
         support.unlink(addr)
-        support.bind_unix_socket(sock, addr)
+        socket_helper.bind_unix_socket(sock, addr)
     else:
         sock.bind(addr)
 
@@ -327,7 +328,7 @@ class DispatcherWithSendTests(unittest.TestCase):
         evt = threading.Event()
         sock = socket.socket()
         sock.settimeout(3)
-        port = support.bind_port(sock)
+        port = socket_helper.bind_port(sock)
 
         cap = BytesIO()
         args = (evt, cap, sock)
@@ -341,7 +342,7 @@ class DispatcherWithSendTests(unittest.TestCase):
             data = b"Suppose there isn't a 16-ton weight?"
             d = dispatcherwithsend_noread()
             d.create_socket()
-            d.connect((support.HOST, port))
+            d.connect((socket_helper.HOST, port))
 
             # give time for socket to connect
             time.sleep(0.1)
@@ -791,12 +792,12 @@ class BaseTestAPI:
 
 class TestAPI_UseIPv4Sockets(BaseTestAPI):
     family = socket.AF_INET
-    addr = (support.HOST, 0)
+    addr = (socket_helper.HOST, 0)
 
-@unittest.skipUnless(support.IPV6_ENABLED, 'IPv6 support required')
+@unittest.skipUnless(socket_helper.IPV6_ENABLED, 'IPv6 support required')
 class TestAPI_UseIPv6Sockets(BaseTestAPI):
     family = socket.AF_INET6
-    addr = (support.HOSTv6, 0)
+    addr = (socket_helper.HOSTv6, 0)
 
 @unittest.skipUnless(HAS_UNIX_SOCKETS, 'Unix sockets required')
 class TestAPI_UseUnixSockets(BaseTestAPI):