Fix problem reported by pychecker where AuthenticationError wasn't imported.
Add some test coverage to this code. More tests should be added (TODO added).
R=Brett
TESTED=./python -E -tt ./Lib/test/regrtest.py test_multiprocessing
diff --git a/Lib/multiprocessing/connection.py b/Lib/multiprocessing/connection.py
index cbdcf13..1f05658 100644
--- a/Lib/multiprocessing/connection.py
+++ b/Lib/multiprocessing/connection.py
@@ -17,7 +17,7 @@
import itertools
import _multiprocessing
-from multiprocessing import current_process
+from multiprocessing import current_process, AuthenticationError
from multiprocessing.util import get_temp_dir, Finalize, sub_debug, debug
from multiprocessing.forking import duplicate, close