diff --git a/Lib/test/support/socket_helper.py b/Lib/test/support/socket_helper.py
index f709ffd..7070c12 100644
--- a/Lib/test/support/socket_helper.py
+++ b/Lib/test/support/socket_helper.py
@@ -146,7 +146,7 @@
         return unittest.skip('No UNIX Sockets')(test)
     global _bind_nix_socket_error
     if _bind_nix_socket_error is None:
-        from test.support import TESTFN, unlink
+        from .os_helper import TESTFN, unlink
         path = TESTFN + "can_bind_unix_socket"
         with socket.socket(socket.AF_UNIX) as sock:
             try:
diff --git a/Lib/test/test_asyncio/__init__.py b/Lib/test/test_asyncio/__init__.py
index c77c7a8..5d41504 100644
--- a/Lib/test/test_asyncio/__init__.py
+++ b/Lib/test/test_asyncio/__init__.py
@@ -1,8 +1,10 @@
 import os
-from test.support import load_package_tests, import_module
+from test.support import load_package_tests
+from test.support import import_helper
+
 
 # Skip tests if we don't have concurrent.futures.
-import_module('concurrent.futures')
+import_helper.import_module('concurrent.futures')
 
 def load_tests(*args):
     return load_package_tests(os.path.dirname(__file__), *args)
diff --git a/Lib/test/test_asyncio/test_base_events.py b/Lib/test/test_asyncio/test_base_events.py
index 533d5cc..f74dabc 100644
--- a/Lib/test/test_asyncio/test_base_events.py
+++ b/Lib/test/test_asyncio/test_base_events.py
@@ -16,6 +16,7 @@
 from test.test_asyncio import utils as test_utils
 from test import support
 from test.support.script_helper import assert_python_ok
+from test.support import os_helper
 from test.support import socket_helper
 
 
@@ -1983,14 +1984,14 @@
     def setUpClass(cls):
         cls.__old_bufsize = constants.SENDFILE_FALLBACK_READBUFFER_SIZE
         constants.SENDFILE_FALLBACK_READBUFFER_SIZE = 1024 * 16
-        with open(support.TESTFN, 'wb') as fp:
+        with open(os_helper.TESTFN, 'wb') as fp:
             fp.write(cls.DATA)
         super().setUpClass()
 
     @classmethod
     def tearDownClass(cls):
         constants.SENDFILE_FALLBACK_READBUFFER_SIZE = cls.__old_bufsize
-        support.unlink(support.TESTFN)
+        os_helper.unlink(os_helper.TESTFN)
         super().tearDownClass()
 
     def setUp(self):
@@ -1998,7 +1999,7 @@
         # BaseSelectorEventLoop() has no native implementation
         self.loop = BaseSelectorEventLoop()
         self.set_event_loop(self.loop)
-        self.file = open(support.TESTFN, 'rb')
+        self.file = open(os_helper.TESTFN, 'rb')
         self.addCleanup(self.file.close)
         super().setUp()
 
@@ -2095,7 +2096,7 @@
 
     def test_nonbinary_file(self):
         sock = self.make_socket()
-        with open(support.TESTFN, 'r') as f:
+        with open(os_helper.TESTFN, 'r') as f:
             with self.assertRaisesRegex(ValueError, "binary mode"):
                 self.run_loop(self.loop.sock_sendfile(sock, f))
 
diff --git a/Lib/test/test_asyncio/test_sendfile.py b/Lib/test/test_asyncio/test_sendfile.py
index dbce199..a30d9b9 100644
--- a/Lib/test/test_asyncio/test_sendfile.py
+++ b/Lib/test/test_asyncio/test_sendfile.py
@@ -10,6 +10,7 @@
 from asyncio import constants
 from unittest import mock
 from test import support
+from test.support import os_helper
 from test.support import socket_helper
 from test.test_asyncio import utils as test_utils
 
@@ -98,17 +99,17 @@
 
     @classmethod
     def setUpClass(cls):
-        with open(support.TESTFN, 'wb') as fp:
+        with open(os_helper.TESTFN, 'wb') as fp:
             fp.write(cls.DATA)
         super().setUpClass()
 
     @classmethod
     def tearDownClass(cls):
-        support.unlink(support.TESTFN)
+        os_helper.unlink(os_helper.TESTFN)
         super().tearDownClass()
 
     def setUp(self):
-        self.file = open(support.TESTFN, 'rb')
+        self.file = open(os_helper.TESTFN, 'rb')
         self.addCleanup(self.file.close)
         self.loop = self.create_event_loop()
         self.set_event_loop(self.loop)
diff --git a/Lib/test/test_asyncio/test_subprocess.py b/Lib/test/test_asyncio/test_subprocess.py
index 6657a88..177a02c 100644
--- a/Lib/test/test_asyncio/test_subprocess.py
+++ b/Lib/test/test_asyncio/test_subprocess.py
@@ -10,6 +10,7 @@
 from asyncio import subprocess
 from test.test_asyncio import utils as test_utils
 from test import support
+from test.support import os_helper
 
 if sys.platform != 'win32':
     from asyncio import unix_events
@@ -626,10 +627,10 @@
     def test_create_subprocess_exec_with_path(self):
         async def execute():
             p = await subprocess.create_subprocess_exec(
-                support.FakePath(sys.executable), '-c', 'pass')
+                os_helper.FakePath(sys.executable), '-c', 'pass')
             await p.wait()
             p = await subprocess.create_subprocess_exec(
-                sys.executable, '-c', 'pass', support.FakePath('.'))
+                sys.executable, '-c', 'pass', os_helper.FakePath('.'))
             await p.wait()
 
         self.assertIsNone(self.loop.run_until_complete(execute()))
@@ -737,7 +738,7 @@
 
             with self.assertRaises(RuntimeError):
                 await subprocess.create_subprocess_exec(
-                    support.FakePath(sys.executable), '-c', 'pass')
+                    os_helper.FakePath(sys.executable), '-c', 'pass')
 
             watcher.add_child_handler.assert_not_called()
 
diff --git a/Lib/test/test_asyncio/test_unix_events.py b/Lib/test/test_asyncio/test_unix_events.py
index 10bd46d..2c7d52a 100644
--- a/Lib/test/test_asyncio/test_unix_events.py
+++ b/Lib/test/test_asyncio/test_unix_events.py
@@ -14,7 +14,7 @@
 import threading
 import unittest
 from unittest import mock
-from test import support
+from test.support import os_helper
 from test.support import socket_helper
 
 if sys.platform == 'win32':
@@ -467,19 +467,19 @@
 
     @classmethod
     def setUpClass(cls):
-        with open(support.TESTFN, 'wb') as fp:
+        with open(os_helper.TESTFN, 'wb') as fp:
             fp.write(cls.DATA)
         super().setUpClass()
 
     @classmethod
     def tearDownClass(cls):
-        support.unlink(support.TESTFN)
+        os_helper.unlink(os_helper.TESTFN)
         super().tearDownClass()
 
     def setUp(self):
         self.loop = asyncio.new_event_loop()
         self.set_event_loop(self.loop)
-        self.file = open(support.TESTFN, 'rb')
+        self.file = open(os_helper.TESTFN, 'rb')
         self.addCleanup(self.file.close)
         super().setUp()
 
diff --git a/Lib/test/test_getopt.py b/Lib/test/test_getopt.py
index 9275dc4..9261276 100644
--- a/Lib/test/test_getopt.py
+++ b/Lib/test/test_getopt.py
@@ -1,7 +1,8 @@
 # test_getopt.py
 # David Goodger <dgoodger@bigfoot.com> 2000-08-19
 
-from test.support import verbose, run_doctest, EnvironmentVarGuard
+from test.support import verbose, run_doctest
+from test.support.os_helper import EnvironmentVarGuard
 import unittest
 
 import getopt
diff --git a/Lib/test/test_tcl.py b/Lib/test/test_tcl.py
index 1c5b9cf..db982da 100644
--- a/Lib/test/test_tcl.py
+++ b/Lib/test/test_tcl.py
@@ -5,9 +5,10 @@
 import os
 import warnings
 from test import support
+from test.support import import_helper
 
 # Skip this test if the _tkinter module wasn't built.
-_tkinter = support.import_module('_tkinter')
+_tkinter = import_helper.import_module('_tkinter')
 
 import tkinter
 from tkinter import Tcl
diff --git a/Lib/test/test_xmlrpc.py b/Lib/test/test_xmlrpc.py
index 79f702d..3dfa84b 100644
--- a/Lib/test/test_xmlrpc.py
+++ b/Lib/test/test_xmlrpc.py
@@ -15,6 +15,7 @@
 import io
 import contextlib
 from test import support
+from test.support import os_helper
 from test.support import socket_helper
 from test.support import threading_helper
 from test.support import ALWAYS_EQ, LARGEST, SMALLEST
@@ -1372,7 +1373,7 @@
         self.cgi = None
 
     def test_cgi_get(self):
-        with support.EnvironmentVarGuard() as env:
+        with os_helper.EnvironmentVarGuard() as env:
             env['REQUEST_METHOD'] = 'GET'
             # if the method is GET and no request_text is given, it runs handle_get
             # get sysout output
@@ -1404,7 +1405,7 @@
         </methodCall>
         """
 
-        with support.EnvironmentVarGuard() as env, \
+        with os_helper.EnvironmentVarGuard() as env, \
              captured_stdout(encoding=self.cgi.encoding) as data_out, \
              support.captured_stdin() as data_in:
             data_in.write(data)