bpo-40275: Use new test.support helper submodules in tests (GH-20849)

diff --git a/Lib/test/test_decimal.py b/Lib/test/test_decimal.py
index ed483a4..716e6eb 100644
--- a/Lib/test/test_decimal.py
+++ b/Lib/test/test_decimal.py
@@ -34,8 +34,9 @@
 import locale
 from test.support import (run_unittest, run_doctest, is_resource_enabled,
                           requires_IEEE_754, requires_docstrings)
-from test.support import (import_fresh_module, TestFailed,
+from test.support import (TestFailed,
                           run_with_locale, cpython_only)
+from test.support.import_helper import import_fresh_module
 import random
 import inspect
 import threading