Issue #14442: Add missing errno import in test_smtplib.

Lib/test/test_smtplib.py

@@ -9,6 +9,7 @@ import re
 import sys
 import time
 import select
+import errno
 
 import unittest
 from test import support, mock_socket

Misc/NEWS

@@ -196,6 +196,8 @@ Extension Modules
 Tests
 -----
 
+- Issue #14442: Add missing errno import in test_smtplib.
+
 - Issue #8315: (partial fix) python -m unittest test.test_email now works.