[CORD-3092][CORD-3042] Autogenerate c_tag for subscriber

Change-Id: I2f8eaf3fcd3ef1148e0070c307177c60ee79d6a1
diff --git a/xos/synchronizer/models/test_models.py b/xos/synchronizer/models/test_models.py
new file mode 100644
index 0000000..bb2a469
--- /dev/null
+++ b/xos/synchronizer/models/test_models.py
@@ -0,0 +1,128 @@
+# 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, Mock, MagicMock
+
+# mocking XOS exception, as they're based in Django
+class Exceptions:
+    XOSValidationError = Exception
+    XOSProgrammingError = Exception
+    XOSPermissionDenied = Exception
+
+class XOS:
+    exceptions = Exceptions
+
+class TestRCORDModels(unittest.TestCase):
+    def setUp(self):
+        self.xos = XOS
+
+        self.models_decl = Mock()
+        self.models_decl.RCORDSubscriber_decl = MagicMock
+        self.models_decl.RCORDSubscriber_decl.save = Mock()
+        self.models_decl.RCORDSubscriber_decl.objects = Mock()
+        self.models_decl.RCORDSubscriber_decl.objects.filter.return_value = []
+
+
+        modules = {
+            'xos.exceptions': self.xos.exceptions,
+            'models_decl': self.models_decl
+        }
+
+        self.module_patcher = patch.dict('sys.modules', modules)
+        self.module_patcher.start()
+
+        self.volt = Mock()
+
+        from models import RCORDSubscriber
+
+        self.rcord_subscriber_class = RCORDSubscriber
+
+        self.rcord_subscriber = RCORDSubscriber()
+        self.rcord_subscriber.onu_device = "BRCM1234"
+        self.rcord_subscriber.c_tag = "111"
+        self.rcord_subscriber.ip_address = "1.1.1.1"
+        self.rcord_subscriber.mac_address = "00:AA:00:00:00:01"
+        self.rcord_subscriber.owner.leaf_model.access = "voltha"
+        self.rcord_subscriber.owner.provider_services = [self.volt]
+
+
+    def test_save(self):
+        self.rcord_subscriber.save()
+        self.models_decl.RCORDSubscriber_decl.save.assert_called()
+
+    def test_validate_ip_address(self):
+        self.rcord_subscriber.ip_address = "invalid"
+        with self.assertRaises(Exception) as e:
+            self.rcord_subscriber.save()
+
+        self.assertEqual(e.exception.message, "The ip_address you specified (invalid) is not valid")
+        self.models_decl.RCORDSubscriber_decl.save.assert_not_called()
+
+    def test_validate_mac_address(self):
+        self.rcord_subscriber.mac_address = "invalid"
+        with self.assertRaises(Exception) as e:
+            self.rcord_subscriber.save()
+
+        self.assertEqual(e.exception.message, "The mac_address you specified (invalid) is not valid")
+        self.models_decl.RCORDSubscriber_decl.save.assert_not_called()
+
+    def test_valid_onu_device(self):
+        self.rcord_subscriber.save()
+        self.models_decl.RCORDSubscriber_decl.save.assert_called()
+
+    def test_invalid_onu_device(self):
+        self.volt.leaf_model.has_access_device.return_value = False
+        with self.assertRaises(Exception) as e:
+            self.rcord_subscriber.save()
+
+        self.assertEqual(e.exception.message, "The onu_device you specified (BRCM1234) does not exists")
+        self.models_decl.RCORDSubscriber_decl.save.assert_not_called()
+
+    def test_validate_c_tag(self):
+        """
+        check that other subscriber attached to the same ONU don't have the same c_tag
+        """
+
+        s = Mock()
+        s.c_tag = "111"
+        s.onu_device = "BRCM1234"
+
+        self.models_decl.RCORDSubscriber_decl.objects.filter.return_value = [s]
+
+        with self.assertRaises(Exception) as e:
+            self.rcord_subscriber.save()
+
+        self.assertEqual(e.exception.message, "The c_tag you specified (111) has already been used on device BRCM1234")
+        self.models_decl.RCORDSubscriber_decl.save.assert_not_called()
+
+
+    def test_generate_c_tag(self):
+        s = Mock()
+        s.c_tag = "111"
+        s.onu_device = "BRCM1234"
+
+        self.models_decl.RCORDSubscriber_decl.objects.filter.return_value = [s]
+        self.rcord_subscriber.c_tag = None
+
+        self.rcord_subscriber.save()
+
+        self.models_decl.RCORDSubscriber_decl.save.assert_called()
+        self.assertNotEquals(self.rcord_subscriber.c_tag, "111")
+        self.assertGreater(self.rcord_subscriber.c_tag, 16)
+        self.assertLess(self.rcord_subscriber.c_tag, 4097)
+
+
+if __name__ == '__main__':
+    unittest.main()