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, 10 insertions, 9 deletions

diff --git a/Lib/test/test_asyncio/test_events.py b/Lib/test/test_asyncio/test_events.py
index 1f71c1f..aa4daca 100644
--- a/Lib/test/test_asyncio/test_events.py
+++ b/Lib/test/test_asyncio/test_events.py
@@ -32,6 +32,7 @@ from asyncio import proactor_events
 from asyncio import selector_events
 from test.test_asyncio import utils as test_utils
 from test import support
+from test.support import socket_helper
 from test.support import ALWAYS_EQ, LARGEST, SMALLEST
 
 
@@ -517,7 +518,7 @@ class EventLoopTestsMixin:
                 lambda: MyProto(loop=self.loop), *httpd.address)
             self._basetest_create_connection(conn_fut)
 
-    @support.skip_unless_bind_unix_socket
+    @socket_helper.skip_unless_bind_unix_socket
     def test_create_unix_connection(self):
         # Issue #20682: On Mac OS X Tiger, getsockname() returns a
         # zero-length address for UNIX socket.
@@ -619,7 +620,7 @@ class EventLoopTestsMixin:
             self._test_create_ssl_connection(httpd, create_connection,
                                              peername=httpd.address)
 
-    @support.skip_unless_bind_unix_socket
+    @socket_helper.skip_unless_bind_unix_socket
     @unittest.skipIf(ssl is None, 'No ssl module')
     def test_create_ssl_unix_connection(self):
         # Issue #20682: On Mac OS X Tiger, getsockname() returns a
@@ -638,7 +639,7 @@ class EventLoopTestsMixin:
 
     def test_create_connection_local_addr(self):
         with test_utils.run_test_server() as httpd:
-            port = support.find_unused_port()
+            port = socket_helper.find_unused_port()
             f = self.loop.create_connection(
                 lambda: MyProto(loop=self.loop),
                 *httpd.address, local_addr=(httpd.address[0], port))
@@ -843,7 +844,7 @@ class EventLoopTestsMixin:
 
         return server, path
 
-    @support.skip_unless_bind_unix_socket
+    @socket_helper.skip_unless_bind_unix_socket
     def test_create_unix_server(self):
         proto = MyProto(loop=self.loop)
         server, path = self._make_unix_server(lambda: proto)
@@ -935,7 +936,7 @@ class EventLoopTestsMixin:
         # stop serving
         server.close()
 
-    @support.skip_unless_bind_unix_socket
+    @socket_helper.skip_unless_bind_unix_socket
     @unittest.skipIf(ssl is None, 'No ssl module')
     def test_create_unix_server_ssl(self):
         proto = MyProto(loop=self.loop)
@@ -995,7 +996,7 @@ class EventLoopTestsMixin:
         self.assertIsNone(proto.transport)
         server.close()
 
-    @support.skip_unless_bind_unix_socket
+    @socket_helper.skip_unless_bind_unix_socket
     @unittest.skipIf(ssl is None, 'No ssl module')
     def test_create_unix_server_ssl_verify_failed(self):
         proto = MyProto(loop=self.loop)
@@ -1055,7 +1056,7 @@ class EventLoopTestsMixin:
         self.assertIsNone(proto.transport)
         server.close()
 
-    @support.skip_unless_bind_unix_socket
+    @socket_helper.skip_unless_bind_unix_socket
     @unittest.skipIf(ssl is None, 'No ssl module')
     def test_create_unix_server_ssl_verified(self):
         proto = MyProto(loop=self.loop)
@@ -1148,7 +1149,7 @@ class EventLoopTestsMixin:
 
         server.close()
 
-    @unittest.skipUnless(support.IPV6_ENABLED, 'IPv6 not supported or enabled')
+    @unittest.skipUnless(socket_helper.IPV6_ENABLED, 'IPv6 not supported or enabled')
     def test_create_server_dual_stack(self):
         f_proto = self.loop.create_future()
 
@@ -1160,7 +1161,7 @@ class EventLoopTestsMixin:
         try_count = 0
         while True:
             try:
-                port = support.find_unused_port()
+                port = socket_helper.find_unused_port()
                 f = self.loop.create_server(TestMyProto, host=None, port=port)
                 server = self.loop.run_until_complete(f)
             except OSError as ex: