diff --git a/Lib/test/eintrdata/eintr_tester.py b/Lib/test/eintrdata/eintr_tester.py
index 606f31b..e43b59d 100644
--- a/Lib/test/eintrdata/eintr_tester.py
+++ b/Lib/test/eintrdata/eintr_tester.py
@@ -22,6 +22,7 @@
 import unittest
 
 from test import support
+from test.support import os_helper
 from test.support import socket_helper
 
 @contextlib.contextmanager
@@ -314,16 +315,16 @@
     @support.requires_freebsd_version(10, 3)
     @unittest.skipUnless(hasattr(os, 'mkfifo'), 'needs mkfifo()')
     def _test_open(self, do_open_close_reader, do_open_close_writer):
-        filename = support.TESTFN
+        filename = os_helper.TESTFN
 
         # Use a fifo: until the child opens it for reading, the parent will
         # block when trying to open it for writing.
-        support.unlink(filename)
+        os_helper.unlink(filename)
         try:
             os.mkfifo(filename)
         except PermissionError as e:
             self.skipTest('os.mkfifo(): %s' % e)
-        self.addCleanup(support.unlink, filename)
+        self.addCleanup(os_helper.unlink, filename)
 
         code = '\n'.join((
             'import os, time',
@@ -486,16 +487,16 @@
 
 class FNTLEINTRTest(EINTRBaseTest):
     def _lock(self, lock_func, lock_name):
-        self.addCleanup(support.unlink, support.TESTFN)
+        self.addCleanup(os_helper.unlink, os_helper.TESTFN)
         code = '\n'.join((
             "import fcntl, time",
-            "with open('%s', 'wb') as f:" % support.TESTFN,
+            "with open('%s', 'wb') as f:" % os_helper.TESTFN,
             "   fcntl.%s(f, fcntl.LOCK_EX)" % lock_name,
             "   time.sleep(%s)" % self.sleep_time))
         start_time = time.monotonic()
         proc = self.subprocess(code)
         with kill_on_error(proc):
-            with open(support.TESTFN, 'wb') as f:
+            with open(os_helper.TESTFN, 'wb') as f:
                 while True:  # synchronize the subprocess
                     dt = time.monotonic() - start_time
                     if dt > 60.0:
diff --git a/Lib/test/test_email/test_email.py b/Lib/test/test_email/test_email.py
index 1d28e26..ba4ed69 100644
--- a/Lib/test/test_email/test_email.py
+++ b/Lib/test/test_email/test_email.py
@@ -38,7 +38,7 @@
 from email import quoprimime
 
 from test.support import threading_helper
-from test.support import unlink
+from test.support.os_helper import unlink
 from test.test_email import openfile, TestEmailBase
 
 # These imports are documented to work, but we are testing them using a
diff --git a/Lib/test/test_multibytecodec.py b/Lib/test/test_multibytecodec.py
index 3cf5d7b..7c3b67f 100644
--- a/Lib/test/test_multibytecodec.py
+++ b/Lib/test/test_multibytecodec.py
@@ -4,7 +4,8 @@
 #
 
 from test import support
-from test.support import TESTFN
+from test.support import os_helper
+from test.support.os_helper import TESTFN
 import unittest, io, codecs, sys
 import _multibytecodec
 
@@ -57,7 +58,7 @@
                 code = '# coding: {}\n'.format(enc)
                 exec(code)
         finally:
-            support.unlink(TESTFN)
+            os_helper.unlink(TESTFN)
 
     def test_init_segfault(self):
         # bug #3305: this used to segfault
@@ -296,7 +297,7 @@
             finally:
                 f.close()
         finally:
-            support.unlink(TESTFN)
+            os_helper.unlink(TESTFN)
 
 class Test_StreamWriter(unittest.TestCase):
     def test_gb18030(self):
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index 65bca29..1a2bbb3 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -12,7 +12,7 @@
 
 from contextlib import ExitStack
 from io import StringIO
-from test import support
+from test.support import os_helper
 # This little helper class is essential for testing pdb under doctest.
 from test.test_doctest import _FakeInput
 from unittest.mock import patch
@@ -1188,10 +1188,10 @@
 
 class PdbTestCase(unittest.TestCase):
     def tearDown(self):
-        support.unlink(support.TESTFN)
+        os_helper.unlink(os_helper.TESTFN)
 
     def _run_pdb(self, pdb_args, commands):
-        self.addCleanup(support.rmtree, '__pycache__')
+        self.addCleanup(os_helper.rmtree, '__pycache__')
         cmd = [sys.executable, '-m', 'pdb'] + pdb_args
         with subprocess.Popen(
                 cmd,
@@ -1210,13 +1210,13 @@
         filename = 'main.py'
         with open(filename, 'w') as f:
             f.write(textwrap.dedent(script))
-        self.addCleanup(support.unlink, filename)
+        self.addCleanup(os_helper.unlink, filename)
         return self._run_pdb([filename], commands)
 
     def run_pdb_module(self, script, commands):
         """Runs the script code as part of a module"""
         self.module_name = 't_main'
-        support.rmtree(self.module_name)
+        os_helper.rmtree(self.module_name)
         main_file = self.module_name + '/__main__.py'
         init_file = self.module_name + '/__init__.py'
         os.mkdir(self.module_name)
@@ -1224,17 +1224,17 @@
             pass
         with open(main_file, 'w') as f:
             f.write(textwrap.dedent(script))
-        self.addCleanup(support.rmtree, self.module_name)
+        self.addCleanup(os_helper.rmtree, self.module_name)
         return self._run_pdb(['-m', self.module_name], commands)
 
     def _assert_find_function(self, file_content, func_name, expected):
-        with open(support.TESTFN, 'wb') as f:
+        with open(os_helper.TESTFN, 'wb') as f:
             f.write(file_content)
 
         expected = None if not expected else (
-            expected[0], support.TESTFN, expected[1])
+            expected[0], os_helper.TESTFN, expected[1])
         self.assertEqual(
-            expected, pdb.find_function(func_name, support.TESTFN))
+            expected, pdb.find_function(func_name, os_helper.TESTFN))
 
     def test_find_function_empty_file(self):
         self._assert_find_function(b'', 'foo', None)
@@ -1284,9 +1284,9 @@
 
     def test_issue7964(self):
         # open the file as binary so we can force \r\n newline
-        with open(support.TESTFN, 'wb') as f:
+        with open(os_helper.TESTFN, 'wb') as f:
             f.write(b'print("testing my pdb")\r\n')
-        cmd = [sys.executable, '-m', 'pdb', support.TESTFN]
+        cmd = [sys.executable, '-m', 'pdb', os_helper.TESTFN]
         proc = subprocess.Popen(cmd,
             stdout=subprocess.PIPE,
             stdin=subprocess.PIPE,
@@ -1327,7 +1327,7 @@
         """
         with open('bar.py', 'w') as f:
             f.write(textwrap.dedent(bar))
-        self.addCleanup(support.unlink, 'bar.py')
+        self.addCleanup(os_helper.unlink, 'bar.py')
         stdout, stderr = self.run_pdb_script(script, commands)
         self.assertTrue(
             any('main.py(5)foo()->None' in l for l in stdout.splitlines()),
@@ -1337,7 +1337,7 @@
         # Invoking "continue" on a non-main thread triggered an exception
         # inside signal.signal.
 
-        with open(support.TESTFN, 'wb') as f:
+        with open(os_helper.TESTFN, 'wb') as f:
             f.write(textwrap.dedent("""
                 import threading
                 import pdb
@@ -1349,7 +1349,7 @@
 
                 t = threading.Thread(target=start_pdb)
                 t.start()""").encode('ascii'))
-        cmd = [sys.executable, '-u', support.TESTFN]
+        cmd = [sys.executable, '-u', os_helper.TESTFN]
         proc = subprocess.Popen(cmd,
             stdout=subprocess.PIPE,
             stdin=subprocess.PIPE,
@@ -1363,7 +1363,7 @@
 
     def test_issue36250(self):
 
-        with open(support.TESTFN, 'wb') as f:
+        with open(os_helper.TESTFN, 'wb') as f:
             f.write(textwrap.dedent("""
                 import threading
                 import pdb
@@ -1379,7 +1379,7 @@
                 pdb.Pdb(readrc=False).set_trace()
                 evt.set()
                 t.join()""").encode('ascii'))
-        cmd = [sys.executable, '-u', support.TESTFN]
+        cmd = [sys.executable, '-u', os_helper.TESTFN]
         proc = subprocess.Popen(cmd,
             stdout=subprocess.PIPE,
             stdin=subprocess.PIPE,
@@ -1412,7 +1412,7 @@
 
         save_home = os.environ.pop('HOME', None)
         try:
-            with support.temp_cwd():
+            with os_helper.temp_cwd():
                 with open('.pdbrc', 'w') as f:
                     f.write("invalid\n")
 
@@ -1437,7 +1437,7 @@
 
     def test_readrc_homedir(self):
         save_home = os.environ.pop("HOME", None)
-        with support.temp_dir() as temp_dir, patch("os.path.expanduser"):
+        with os_helper.temp_dir() as temp_dir, patch("os.path.expanduser"):
             rc_path = os.path.join(temp_dir, ".pdbrc")
             os.path.expanduser.return_value = rc_path
             try:
@@ -1506,12 +1506,12 @@
 
     def test_module_without_a_main(self):
         module_name = 't_main'
-        support.rmtree(module_name)
+        os_helper.rmtree(module_name)
         init_file = module_name + '/__init__.py'
         os.mkdir(module_name)
         with open(init_file, 'w') as f:
             pass
-        self.addCleanup(support.rmtree, module_name)
+        self.addCleanup(os_helper.rmtree, module_name)
         stdout, stderr = self._run_pdb(['-m', module_name], "")
         self.assertIn("ImportError: No module named t_main.__main__",
                       stdout.splitlines())
@@ -1531,11 +1531,11 @@
 
     def test_relative_imports(self):
         self.module_name = 't_main'
-        support.rmtree(self.module_name)
+        os_helper.rmtree(self.module_name)
         main_file = self.module_name + '/__main__.py'
         init_file = self.module_name + '/__init__.py'
         module_file = self.module_name + '/module.py'
-        self.addCleanup(support.rmtree, self.module_name)
+        self.addCleanup(os_helper.rmtree, self.module_name)
         os.mkdir(self.module_name)
         with open(init_file, 'w') as f:
             f.write(textwrap.dedent("""
@@ -1569,11 +1569,11 @@
     def test_relative_imports_on_plain_module(self):
         # Validates running a plain module. See bpo32691
         self.module_name = 't_main'
-        support.rmtree(self.module_name)
+        os_helper.rmtree(self.module_name)
         main_file = self.module_name + '/runme.py'
         init_file = self.module_name + '/__init__.py'
         module_file = self.module_name + '/module.py'
-        self.addCleanup(support.rmtree, self.module_name)
+        self.addCleanup(os_helper.rmtree, self.module_name)
         os.mkdir(self.module_name)
         with open(init_file, 'w') as f:
             f.write(textwrap.dedent("""
diff --git a/Lib/test/test_urllib2_localnet.py b/Lib/test/test_urllib2_localnet.py
index e568cc4..ebb43c3 100644
--- a/Lib/test/test_urllib2_localnet.py
+++ b/Lib/test/test_urllib2_localnet.py
@@ -8,9 +8,9 @@
 import unittest
 import hashlib
 
-from test import support
 from test.support import hashlib_helper
 from test.support import threading_helper
+from test.support import warnings_helper
 
 try:
     import ssl
@@ -567,7 +567,7 @@
 
     def test_https_with_cafile(self):
         handler = self.start_https_server(certfile=CERT_localhost)
-        with support.check_warnings(('', DeprecationWarning)):
+        with warnings_helper.check_warnings(('', DeprecationWarning)):
             # Good cert
             data = self.urlopen("https://localhost:%s/bizarre" % handler.port,
                                 cafile=CERT_localhost)
@@ -585,7 +585,7 @@
     def test_https_with_cadefault(self):
         handler = self.start_https_server(certfile=CERT_localhost)
         # Self-signed cert should fail verification with system certificate store
-        with support.check_warnings(('', DeprecationWarning)):
+        with warnings_helper.check_warnings(('', DeprecationWarning)):
             with self.assertRaises(urllib.error.URLError) as cm:
                 self.urlopen("https://localhost:%s/bizarre" % handler.port,
                              cadefault=True)
diff --git a/Lib/test/test_warnings/__init__.py b/Lib/test/test_warnings/__init__.py
index dcc0ea8..04f7560 100644
--- a/Lib/test/test_warnings/__init__.py
+++ b/Lib/test/test_warnings/__init__.py
@@ -7,14 +7,20 @@
 import textwrap
 import unittest
 from test import support
+from test.support import import_helper
+from test.support import os_helper
+from test.support import warnings_helper
 from test.support.script_helper import assert_python_ok, assert_python_failure
 
 from test.test_warnings.data import stacklevel as warning_tests
 
 import warnings as original_warnings
 
-py_warnings = support.import_fresh_module('warnings', blocked=['_warnings'])
-c_warnings = support.import_fresh_module('warnings', fresh=['_warnings'])
+
+py_warnings = import_helper.import_fresh_module('warnings',
+                                                blocked=['_warnings'])
+c_warnings = import_helper.import_fresh_module('warnings',
+                                               fresh=['_warnings'])
 
 Py_DEBUG = hasattr(sys, 'gettotalrefcount')
 
@@ -440,7 +446,7 @@
 
     def test_stacklevel_import(self):
         # Issue #24305: With stacklevel=2, module-level warnings should work.
-        support.unload('test.test_warnings.data.import_warning')
+        import_helper.unload('test.test_warnings.data.import_warning')
         with warnings_state(self.module):
             with original_warnings.catch_warnings(record=True,
                     module=self.module) as w:
@@ -543,7 +549,7 @@
     module = c_warnings
 
     # As an early adopter, we sanity check the
-    # test.support.import_fresh_module utility function
+    # test.import_helper.import_fresh_module utility function
     def test_accelerated(self):
         self.assertIsNot(original_warnings, self.module)
         self.assertFalse(hasattr(self.module.warn, '__code__'))
@@ -552,7 +558,7 @@
     module = py_warnings
 
     # As an early adopter, we sanity check the
-    # test.support.import_fresh_module utility function
+    # test.import_helper.import_fresh_module utility function
     def test_pure_python(self):
         self.assertIsNot(original_warnings, self.module)
         self.assertTrue(hasattr(self.module.warn, '__code__'))
@@ -927,9 +933,9 @@
     module = py_warnings
 
     def test_tracemalloc(self):
-        self.addCleanup(support.unlink, support.TESTFN)
+        self.addCleanup(os_helper.unlink, os_helper.TESTFN)
 
-        with open(support.TESTFN, 'w') as fp:
+        with open(os_helper.TESTFN, 'w') as fp:
             fp.write(textwrap.dedent("""
                 def func():
                     f = open(__file__)
@@ -949,8 +955,8 @@
             return stderr
 
         # tracemalloc disabled
-        filename = os.path.abspath(support.TESTFN)
-        stderr = run('-Wd', support.TESTFN)
+        filename = os.path.abspath(os_helper.TESTFN)
+        stderr = run('-Wd', os_helper.TESTFN)
         expected = textwrap.dedent(f'''
             {filename}:5: ResourceWarning: unclosed file <...>
               f = None
@@ -959,7 +965,7 @@
         self.assertEqual(stderr, expected)
 
         # tracemalloc enabled
-        stderr = run('-Wd', '-X', 'tracemalloc=2', support.TESTFN)
+        stderr = run('-Wd', '-X', 'tracemalloc=2', os_helper.TESTFN)
         expected = textwrap.dedent(f'''
             {filename}:5: ResourceWarning: unclosed file <...>
               f = None
@@ -1093,7 +1099,7 @@
         wmod = self.module
         if wmod is not sys.modules['warnings']:
             self.skipTest('module to test is not loaded warnings module')
-        with support.check_warnings(quiet=False) as w:
+        with warnings_helper.check_warnings(quiet=False) as w:
             self.assertEqual(w.warnings, [])
             wmod.simplefilter("always")
             wmod.warn("foo")
@@ -1105,18 +1111,18 @@
             w.reset()
             self.assertEqual(w.warnings, [])
 
-        with support.check_warnings():
+        with warnings_helper.check_warnings():
             # defaults to quiet=True without argument
             pass
-        with support.check_warnings(('foo', UserWarning)):
+        with warnings_helper.check_warnings(('foo', UserWarning)):
             wmod.warn("foo")
 
         with self.assertRaises(AssertionError):
-            with support.check_warnings(('', RuntimeWarning)):
+            with warnings_helper.check_warnings(('', RuntimeWarning)):
                 # defaults to quiet=False with argument
                 pass
         with self.assertRaises(AssertionError):
-            with support.check_warnings(('foo', RuntimeWarning)):
+            with warnings_helper.check_warnings(('foo', RuntimeWarning)):
                 wmod.warn("foo")
 
 class CCatchWarningTests(CatchWarningTests, unittest.TestCase):
@@ -1198,7 +1204,7 @@
     @unittest.skipUnless(sys.getfilesystemencoding() != 'ascii',
                          'requires non-ascii filesystemencoding')
     def test_nonascii(self):
-        PYTHONWARNINGS="ignore:DeprecationWarning" + support.FS_NONASCII
+        PYTHONWARNINGS="ignore:DeprecationWarning" + os_helper.FS_NONASCII
         rc, stdout, stderr = assert_python_ok("-c",
             "import sys; sys.stdout.write(str(sys.warnoptions))",
             PYTHONIOENCODING="utf-8",
@@ -1218,7 +1224,7 @@
         # "import encodings" emits a warning whereas the warnings is not loaded
         # or not completely loaded (warnings imports indirectly encodings by
         # importing linecache) yet
-        with support.temp_cwd() as cwd, support.temp_cwd('encodings'):
+        with os_helper.temp_cwd() as cwd, os_helper.temp_cwd('encodings'):
             # encodings loaded by initfsencoding()
             assert_python_ok('-c', 'pass', PYTHONPATH=cwd)