gh-71052: fix test_concurrent_futures wasi regression. (#115923)

Fix the WASI test_concurrent_futures regression from #115917.

diff --git a/Lib/test/test_concurrent_futures/__init__.py b/Lib/test/test_concurrent_futures/__init__.py
index 17a2853173ba18aa8235096e60036c1e4a15948e..b38bd38d338f0ee0cae5c7f9b1a120a110fbbe5c 100644 (file)
--- a/Lib/test/test_concurrent_futures/__init__.py
+++ b/Lib/test/test_concurrent_futures/__init__.py
@@ -1,7 +1,11 @@
 import os.path
 import unittest
 from test import support
-from test.support import import_helper
+from test.support import threading_helper
+
+
+# Adjust if we ever have a platform with processes but not threads.
+threading_helper.requires_working_threading(module=True)
 
 
 if support.check_sanitizer(address=True, memory=True):