bpo-40275: Use new test.support helper submodules in tests (GH-21451)
diff --git a/Lib/test/test_largefile.py b/Lib/test/test_largefile.py
index a99b4ba..8f6bec1 100644
--- a/Lib/test/test_largefile.py
+++ b/Lib/test/test_largefile.py
@@ -8,9 +8,10 @@
import socket
import shutil
import threading
-from test.support import TESTFN, requires, unlink, bigmemtest
+from test.support import requires, bigmemtest
from test.support import SHORT_TIMEOUT
from test.support import socket_helper
+from test.support.os_helper import TESTFN, unlink
import io # C implementation of io
import _pyio as pyio # Python implementation of io