bpo-40275: Fix failed test cases by using test helpers

Lib/test/test__osx_support.py

@@ -8,7 +8,6 @@
 import sys
 import unittest
 
-import test.support
 from test.support import os_helper
 
 import _osx_support
@@ -20,7 +19,7 @@ def setUp(self):
         self.maxDiff = None
         self.prog_name = 'bogus_program_xxxx'
         self.temp_path_dir = os.path.abspath(os.getcwd())
-        self.env = test.support.EnvironmentVarGuard()
+        self.env = os_helper.EnvironmentVarGuard()
         self.addCleanup(self.env.__exit__)
         for cv in ('CFLAGS', 'LDFLAGS', 'CPPFLAGS',
                             'BASECFLAGS', 'BLDSHARED', 'LDSHARED', 'CC',

Lib/test/test_importlib/extension/test_case_sensitivity.py

@@ -1,5 +1,5 @@
 from importlib import _bootstrap_external
-from test import support
+from test.support import os_helper
 import unittest
 import sys
 from .. import util
@@ -23,15 +23,15 @@ def find_module(self):
 
     @unittest.skipIf(sys.flags.ignore_environment, 'ignore_environment flag was set')
     def test_case_sensitive(self):
-        with support.EnvironmentVarGuard() as env:
+        with os_helper.EnvironmentVarGuard() as env:
             env.unset('PYTHONCASEOK')
             self.caseok_env_changed(should_exist=False)
             loader = self.find_module()
             self.assertIsNone(loader)
 
     @unittest.skipIf(sys.flags.ignore_environment, 'ignore_environment flag was set')
     def test_case_insensitivity(self):
-        with support.EnvironmentVarGuard() as env:
+        with os_helper.EnvironmentVarGuard() as env:
             env.set('PYTHONCASEOK', '1')
             self.caseok_env_changed(should_exist=True)
             loader = self.find_module()

Lib/test/test_importlib/source/test_case_sensitivity.py

@@ -7,7 +7,7 @@
 machinery = util.import_importlib('importlib.machinery')
 
 import os
-from test import support as test_support
+from test.support import os_helper
 import unittest
 
 
@@ -42,7 +42,7 @@ def sensitivity_test(self):
 
     @unittest.skipIf(sys.flags.ignore_environment, 'ignore_environment flag was set')
     def test_sensitive(self):
-        with test_support.EnvironmentVarGuard() as env:
+        with os_helper.EnvironmentVarGuard() as env:
             env.unset('PYTHONCASEOK')
             self.caseok_env_changed(should_exist=False)
             sensitive, insensitive = self.sensitivity_test()
@@ -52,7 +52,7 @@ def test_sensitive(self):
 
     @unittest.skipIf(sys.flags.ignore_environment, 'ignore_environment flag was set')
     def test_insensitive(self):
-        with test_support.EnvironmentVarGuard() as env:
+        with os_helper.EnvironmentVarGuard() as env:
             env.set('PYTHONCASEOK', '1')
             self.caseok_env_changed(should_exist=True)
             sensitive, insensitive = self.sensitivity_test()

Lib/test/test_selectors.py

@@ -6,6 +6,7 @@
 import socket
 import sys
 from test import support
+from test.support import os_helper
 from test.support import socket_helper
 from time import sleep
 import unittest
@@ -536,7 +537,7 @@ def test_register_bad_fd(self):
         # a file descriptor that's been closed should raise an OSError
         # with EBADF
         s = self.SELECTOR()
-        bad_f = support.make_bad_fd()
+        bad_f = os_helper.make_bad_fd()
         with self.assertRaises(OSError) as cm:
             s.register(bad_f, selectors.EVENT_READ)
         self.assertEqual(cm.exception.errno, errno.EBADF)