diff --git a/xos/synchronizer/test_helpers.py b/xos/synchronizer/test_helpers.py
new file mode 100644
index 0000000..910930b
--- /dev/null
+++ b/xos/synchronizer/test_helpers.py
@@ -0,0 +1,171 @@
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import unittest
+from mock import patch, call, Mock, PropertyMock
+import json
+
+import os, sys
+
+# Hack to load synchronizer framework
+test_path=os.path.abspath(os.path.dirname(os.path.realpath(__file__)))
+if not os.path.exists(os.path.join(test_path, "new_base")):
+    xos_dir=os.path.join(test_path, "../../../../../orchestration/xos/xos")
+    services_dir=os.path.join(xos_dir, "../../xos_services")
+# END Hack to load synchronizer framework
+
+
+# generate model from xproto
+def get_models_fn(service_name, xproto_name):
+    name = os.path.join(service_name, "xos", "synchronizer", "models", xproto_name)
+    if os.path.exists(os.path.join(services_dir, name)):
+        return name
+    raise Exception("Unable to find service=%s xproto=%s" % (service_name, xproto_name))
+# END generate model from xproto
+
+class TestAttHelpers(unittest.TestCase):
+
+    def setUp(self):
+
+        self.sys_path_save = sys.path
+        sys.path.append(xos_dir)
+        sys.path.append(os.path.join(xos_dir, 'synchronizers', 'new_base'))
+
+        # Setting up the config module
+        from xosconfig import Config
+        config = os.path.join(test_path, "test_config.yaml")
+        Config.clear()
+        Config.init(config, "synchronizer-config-schema.yaml")
+        # END Setting up the config module
+
+        from synchronizers.new_base.mock_modelaccessor_build import build_mock_modelaccessor
+
+        build_mock_modelaccessor(xos_dir, services_dir, [
+            get_models_fn("att-workflow-driver", "att-workflow-driver.xproto"),
+            get_models_fn("olt-service", "volt.xproto"),
+            get_models_fn("../profiles/rcord", "rcord.xproto")
+        ])
+        import synchronizers.new_base.modelaccessor
+        from helpers import AttHelpers, model_accessor
+
+        # import all class names to globals
+        for (k, v) in model_accessor.all_model_classes.items():
+            globals()[k] = v
+
+        self.helpers = AttHelpers
+
+        self._volt = VOLTService()
+        self._volt.id = 1
+
+        self.volt = Service()
+        self.volt.id = 1
+        self.volt.name = "vOLT"
+        self.volt.leaf_model = self._volt
+
+        self.pon_port = PONPort()
+        self.pon_port.port_no = 1234
+
+        self.onu = ONUDevice()
+        self.onu.pon_port = self.pon_port
+        self.onu.serial_number = "BRCM1234"
+
+        self.att_si = AttWorkflowDriverServiceInstance(
+            serial_number="BRCM1234",
+            owner=self.volt,
+            owner_id=self.volt.id,
+            of_dpid="of:1234"
+        )
+
+        self.whitelist_entry = AttWorkflowDriverWhiteListEntry(
+            serial_number="BRCM1234",
+            owner=self.volt,
+            owner_id=self.volt.id,
+            pon_port_id=1234,
+            device_id="of:1234"
+        )
+
+
+    def tearDown(self):
+        sys.path = self.sys_path_save
+
+    def test_not_in_whitelist(self):
+
+        with patch.object(AttWorkflowDriverWhiteListEntry.objects, "get_items") as whitelist_mock:
+            whitelist_mock.return_value = []
+
+            [res, message] = self.helpers.validate_onu(self.att_si)
+
+            self.assertFalse(res)
+            self.assertEqual(message, "ONU not found in whitelist")
+
+    def test_wrong_location_port(self):
+        self.pon_port.port_no = 666
+        with patch.object(AttWorkflowDriverWhiteListEntry.objects, "get_items") as whitelist_mock, \
+            patch.object(ONUDevice.objects, "get_items") as onu_mock:
+            whitelist_mock.return_value = [self.whitelist_entry]
+            onu_mock.return_value = [self.onu]
+
+            [res, message] = self.helpers.validate_onu(self.att_si)
+
+            self.assertFalse(res)
+            self.assertEqual(message, "ONU activated in wrong location")
+
+    def test_wrong_location_device(self):
+        self.att_si.of_dpid = 666
+        with patch.object(AttWorkflowDriverWhiteListEntry.objects, "get_items") as whitelist_mock, \
+            patch.object(ONUDevice.objects, "get_items") as onu_mock:
+            whitelist_mock.return_value = [self.whitelist_entry]
+            onu_mock.return_value = [self.onu]
+
+            [res, message] = self.helpers.validate_onu(self.att_si)
+
+            self.assertFalse(res)
+            self.assertEqual(message, "ONU activated in wrong location")
+
+    def test_deferred_validation(self):
+        with patch.object(AttWorkflowDriverWhiteListEntry.objects, "get_items") as whitelist_mock, \
+            patch.object(ONUDevice.objects, "get_items") as onu_mock:
+            whitelist_mock.return_value = [self.whitelist_entry]
+            onu_mock.return_value = []
+
+            with self.assertRaises(Exception) as e:
+                self.helpers.validate_onu(self.att_si)
+
+            self.assertEqual(e.exception.message, "ONU device %s is not know to XOS yet" % self.att_si.serial_number)
+
+    def test_validating_onu(self):
+        with patch.object(AttWorkflowDriverWhiteListEntry.objects, "get_items") as whitelist_mock, \
+            patch.object(ONUDevice.objects, "get_items") as onu_mock:
+            whitelist_mock.return_value = [self.whitelist_entry]
+            onu_mock.return_value = [self.onu]
+
+            [res, message] = self.helpers.validate_onu(self.att_si)
+
+            self.assertTrue(res)
+            self.assertEqual(message, "ONU has been validated")
+
+    def test_validating_onu_lowercase(self):
+        self.whitelist_entry.serial_number = "brcm1234"
+        with patch.object(AttWorkflowDriverWhiteListEntry.objects, "get_items") as whitelist_mock, \
+            patch.object(ONUDevice.objects, "get_items") as onu_mock:
+            whitelist_mock.return_value = [self.whitelist_entry]
+            onu_mock.return_value = [self.onu]
+
+            [res, message] = self.helpers.validate_onu(self.att_si)
+
+            self.assertTrue(res)
+            self.assertEqual(message, "ONU has been validated")
+
+if __name__ == '__main__':
+    unittest.main()
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