Added version check to the polygon test to ensure server version >= 1.9

tests/queryset.py

@@ -7,6 +7,7 @@ from mongoengine.queryset import (QuerySet, QuerySetManager,
                                   MultipleObjectsReturned, DoesNotExist,
                                   QueryFieldList)
 from mongoengine import *
+from mongoengine.connection import _get_connection
 from mongoengine.tests import query_counter
 
 
@@ -2197,7 +2198,12 @@ class QuerySetTest(unittest.TestCase):
         self.assertEqual(events.count(), 1)
         self.assertEqual(events[0].id, event2.id)
         
-        # check that polygon works
+        # check that polygon works for users who have a server >= 1.9
+        server_version = tuple(
+            _get_connection().server_info()['version'].split('.')
+        )
+        required_version = tuple("1.9.0".split("."))
+        if server_version >= required_version:
             polygon = [
                 (41.912114,-87.694445),
                 (41.919395,-87.69084),