Skip the ConnectionError test in Python 2.7

tests/api_tests.py

@@ -1,7 +1,9 @@
 import datetime
 import os
 import socket
+import sys
 import uuid
+import unittest
 
 import mock
 
@@ -11,14 +13,7 @@ from tornado import testing
 from tornado_aws import exceptions as aws_exceptions
 
 from sprockets.clients import dynamodb
-from sprockets.clients.dynamodb import exceptions
-
-# Stub ConnectionError for Python 2.7 that doesn't support it
-try:
-    ConnectionError
-except NameError:
-    class ConnectionError(Exception):
-        pass
+from sprockets.clients.dynamodb import connector, exceptions
 
 
 class AsyncTestCase(testing.AsyncTestCase):
@@ -118,7 +113,8 @@ class AWSClientTests(AsyncTestCase):
             with self.assertRaises(exceptions.RequestException):
                 yield self.client.create_table(self.generic_table_definition())
 
-
+    @unittest.skipIf(sys.version_info.major < 3,
+                     'ConnectionError is Python3 only')
     @testing.gen_test
     def test_connection_error_request_exception(self):
         with mock.patch('tornado_aws.client.AsyncAWSClient.fetch') as fetch: