bpo-40275: Use new test.support helper submodules in tests (GH-21448)

diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index a67e69b..2ffe8ca 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -8,10 +8,13 @@
 import weakref
 import errno
 
-from test.support import (TESTFN, captured_stderr, check_impl_detail,
-                          check_warnings, cpython_only, gc_collect,
-                          no_tracing, unlink, import_module, script_helper,
+from test.support import (captured_stderr, check_impl_detail,
+                          cpython_only, gc_collect,
+                          no_tracing, script_helper,
                           SuppressCrashReport)
+from test.support.import_helper import import_module
+from test.support.os_helper import TESTFN, unlink
+from test.support.warnings_helper import check_warnings
 from test import support