Added sns backend to servers, added some tests to check backend

tests/test_iam/test_server.py

@@ -0,0 +1,25 @@
+from __future__ import unicode_literals
+
+import json
+
+import re
+import sure  # noqa
+
+import moto.server as server
+
+'''
+Test the different server responses
+'''
+
+
+def test_iam_server_get():
+    backend = server.create_backend_app("iam")
+    test_client = backend.test_client()
+
+    group_data = test_client.action_data("CreateGroup", GroupName="test group", Path="/")
+    group_id = re.search("<GroupId>(.*)</GroupId>", group_data).groups()[0]
+
+    groups_data = test_client.action_data("ListGroups")
+    groups_ids = re.findall("<GroupId>(.*)</GroupId>", groups_data)
+
+    assert group_id in groups_ids