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, 5 insertions, 4 deletions

diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
index 376f5e3..083ad53 100644
--- a/Lib/test/_test_multiprocessing.py
+++ b/Lib/test/_test_multiprocessing.py
@@ -26,6 +26,7 @@ import warnings
 import test.support
 import test.support.script_helper
 from test import support
+from test.support import socket_helper
 
 
 # Skip tests if _multiprocessing wasn't built.
@@ -2928,7 +2929,7 @@ class _TestRemoteManager(BaseTestCase):
         authkey = os.urandom(32)
 
         manager = QueueManager(
-            address=(test.support.HOST, 0), authkey=authkey, serializer=SERIALIZER
+            address=(socket_helper.HOST, 0), authkey=authkey, serializer=SERIALIZER
             )
         manager.start()
         self.addCleanup(manager.shutdown)
@@ -2965,7 +2966,7 @@ class _TestManagerRestart(BaseTestCase):
     def test_rapid_restart(self):
         authkey = os.urandom(32)
         manager = QueueManager(
-            address=(test.support.HOST, 0), authkey=authkey, serializer=SERIALIZER)
+            address=(socket_helper.HOST, 0), authkey=authkey, serializer=SERIALIZER)
         try:
             srvr = manager.get_server()
             addr = srvr.address
@@ -3455,7 +3456,7 @@ class _TestPicklingConnections(BaseTestCase):
             new_conn.close()
             l.close()
 
-        l = socket.create_server((test.support.HOST, 0))
+        l = socket.create_server((socket_helper.HOST, 0))
         conn.send(l.getsockname())
         new_conn, addr = l.accept()
         conn.send(new_conn)
@@ -4593,7 +4594,7 @@ class TestWait(unittest.TestCase):
 
     def test_wait_socket(self, slow=False):
         from multiprocessing.connection import wait
-        l = socket.create_server((test.support.HOST, 0))
+        l = socket.create_server((socket_helper.HOST, 0))
         addr = l.getsockname()
         readers = []
         procs = []