In a number of places code still revers
to "sys.platform == 'mac'" and that is
dead code because it refers to a platform
that is no longer supported (and hasn't been
supported for several releases).

Fixes issue #7908 for the trunk.
diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
index 0ce329f..430a647 100644
--- a/Lib/test/test_socket.py
+++ b/Lib/test/test_socket.py
@@ -1383,9 +1383,8 @@
 
 def test_main():
     tests = [GeneralModuleTests, BasicTCPTest, TCPCloserTest, TCPTimeoutTest,
-             TestExceptions, BufferIOTest, BasicTCPTest2]
-    if sys.platform != 'mac':
-        tests.extend([ BasicUDPTest, UDPTimeoutTest ])
+             TestExceptions, BufferIOTest, BasicTCPTest2, BasicUDPTest,
+             UDPTimeoutTest ]
 
     tests.extend([
         NonBlockingTCPTests,