bpo-40275: Use new test.support helper submodules in tests (GH-21169)
diff --git a/Lib/test/test_iter.py b/Lib/test/test_iter.py
index 5243469..a7658b5 100644
--- a/Lib/test/test_iter.py
+++ b/Lib/test/test_iter.py
@@ -2,7 +2,8 @@
import sys
import unittest
-from test.support import run_unittest, TESTFN, unlink, cpython_only
+from test.support import run_unittest, cpython_only
+from test.support.os_helper import TESTFN, unlink
from test.support import check_free_after_iterating, ALWAYS_EQ, NEVER_EQ
import pickle
import collections.abc