Issue #7449, part 8: don't skip the whole test_asynchat if threading is missing

TestFifo can be executed without the threading module

Lib/test/test_asynchat.py

@@ -1,16 +1,18 @@
 # test asynchat
 
-import asyncore, asynchat, socket, threading, time
+import asyncore, asynchat, socket, time
 import unittest
 import sys
 from test import test_support
-
-# Skip tests if thread module does not exist.
-test_support.import_module('thread')
+try:
+    import threading
+except ImportError:
+    threading = None
 
 HOST = test_support.HOST
 SERVER_QUIT = 'QUIT\n'
 
+if threading:
     class echo_server(threading.Thread):
         # parameter to determine the number of bytes passed back to the
         # client each send
@@ -94,6 +96,7 @@ def start_echo_server():
         return s, event
 
 
+@unittest.skipUnless(threading, 'Threading required for this test.')
 class TestAsynchat(unittest.TestCase):
     usepoll = False