1 files changed, 15 insertions, 7 deletions
diff --git a/Lib/test/test_smtplib.py b/Lib/test/test_smtplib.py
index 32d2d9b..d36ab0e 100644
--- a/Lib/test/test_smtplib.py
+++ b/Lib/test/test_smtplib.py
@@ -1,7 +1,6 @@
 import asyncore
 import email.utils
 import socket
-import threading
 import smtpd
 import smtplib
 import io
@@ -9,9 +8,14 @@ import sys
 import time
 import select
 
-from unittest import TestCase
+import unittest
 from test import support
 
+try:
+    import threading
+except ImportError:
+    threading = None
+
 HOST = support.HOST
 
 if sys.platform == 'darwin':
@@ -44,7 +48,8 @@ def server(evt, buf, serv):
         serv.close()
         evt.set()
 
-class GeneralTests(TestCase):
+@unittest.skipUnless(threading, 'Threading required for this test.')
+class GeneralTests(unittest.TestCase):
 
     def setUp(self):
         self._threads = support.threading_setup()
@@ -146,7 +151,8 @@ MSG_END = '------------ END MESSAGE ------------\n'
 # test server times out, causing the test to fail.
 
 # Test behavior of smtpd.DebuggingServer
-class DebuggingServerTests(TestCase):
+@unittest.skipUnless(threading, 'Threading required for this test.')
+class DebuggingServerTests(unittest.TestCase):
 
     def setUp(self):
         # temporarily replace sys.stdout to capture DebuggingServer output
@@ -241,7 +247,7 @@ class DebuggingServerTests(TestCase):
         self.assertEqual(self.output.getvalue(), mexpect)
 
 
-class NonConnectingTests(TestCase):
+class NonConnectingTests(unittest.TestCase):
 
     def testNotConnected(self):
         # Test various operations on an unconnected SMTP object that
@@ -262,7 +268,8 @@ class NonConnectingTests(TestCase):
 
 
 # test response of client to a non-successful HELO message
-class BadHELOServerTests(TestCase):
+@unittest.skipUnless(threading, 'Threading required for this test.')
+class BadHELOServerTests(unittest.TestCase):
 
     def setUp(self):
         self.old_stdout = sys.stdout
@@ -386,7 +393,8 @@ class SimSMTPServer(smtpd.SMTPServer):
 
 # Test various SMTP & ESMTP commands/behaviors that require a simulated server
 # (i.e., something with more features than DebuggingServer)
-class SMTPSimTests(TestCase):
+@unittest.skipUnless(threading, 'Threading required for this test.')
+class SMTPSimTests(unittest.TestCase):
 
     def setUp(self):
         self._threads = support.threading_setup()