Pull config from CBS

Signed-off-by: emartin <ephraim.martin@est.tech>
Issue-ID: DCAEGEN2-1843
Change-Id: Id97960dc02aca5531be016d70ea388473b556683

1 files changed, 112 insertions, 0 deletions

diff --git a/components/pm-subscription-handler/tests/config_handler_test.py b/components/pm-subscription-handler/tests/config_handler_test.py
new file mode 100755
index 00000000..fcc25d60
--- /dev/null
+++ b/components/pm-subscription-handler/tests/config_handler_test.py
@@ -0,0 +1,112 @@
+# ============LICENSE_START===================================================
+#  Copyright (C) 2019-2020 Nordix 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+# ============LICENSE_END=====================================================
+
+import json
+import unittest
+from os import environ
+from os import path
+from unittest.mock import patch
+
+import requests
+import responses
+from tenacity import wait_none
+
+from pmsh_service.mod.config_handler import ConfigHandler
+
+
+class ConfigHandlerTest(unittest.TestCase):
+
+    def setUp(self):
+        self.env_vars = {'CONFIG_BINDING_SERVICE_SERVICE_HOST': 'cbs_hostname',
+                         'CONFIG_BINDING_SERVICE_SERVICE_PORT': '10000',
+                         'HOSTNAME': 'hostname'}
+        for key, value in self.env_vars.items():
+            environ[key] = value
+        self.cbs_url = 'http://cbs_hostname:10000/service_component_all/hostname'
+        self.expected_config = self._get_expected_config()
+
+    def test_missing_environment_variable(self):
+        for key, value in self.env_vars.items():
+            with self.assertRaises(KeyError):
+                environ.pop(key)
+                test_value = globals()[value]
+                test_value()
+            environ[key] = value
+
+    @responses.activate
+    def test_get_config_success(self):
+        responses.add(responses.GET, self.cbs_url, json=json.dumps(self.expected_config),
+                      status=200)
+
+        config_handler = ConfigHandler()
+        config_handler.get_config.retry.wait = wait_none()
+
+        self.assertEqual(self.expected_config, config_handler.get_config())
+
+    def test_get_config_already_exists(self):
+        config_handler = ConfigHandler()
+        expected_config = self._get_expected_config()
+        config_handler._config = expected_config
+
+        with patch.object(requests, 'get') as mock_get_request:
+            actual_config = config_handler.get_config()
+
+        self.assertEqual(0, mock_get_request.call_count)
+        self.assertEqual(expected_config, actual_config)
+
+    @responses.activate
+    def test_get_config_error(self):
+        responses.add(responses.GET, self.cbs_url, status=404)
+        config_handler = ConfigHandler()
+        config_handler.get_config.retry.wait = wait_none()
+
+        with self.assertRaises(Exception):
+            config_handler.get_config()
+
+    @responses.activate
+    def test_get_config_max_retries_error(self):
+        retry_limit = 5
+        config_handler = ConfigHandler()
+        config_handler.get_config.retry.wait = wait_none()
+
+        for __ in range(retry_limit):
+            responses.add(responses.GET, self.cbs_url, status=500)
+
+        with self.assertRaises(Exception):
+            config_handler.get_config()
+        self.assertEqual(retry_limit, len(responses.calls))
+
+    @responses.activate
+    def test_get_config_less_than_5_retries_success(self):
+        retry_attempts = 4
+        responses.add(responses.GET, self.cbs_url, status=500)
+        responses.add(responses.GET, self.cbs_url, status=400)
+        responses.add(responses.GET, self.cbs_url, status=300)
+        responses.add(responses.GET, self.cbs_url, json=json.dumps(self.expected_config),
+                      status=200)
+
+        config_handler = ConfigHandler()
+        config_handler.get_config.retry.wait = wait_none()
+        config_handler.get_config()
+
+        self.assertEqual(retry_attempts, len(responses.calls))
+
+    @staticmethod
+    def _get_expected_config():
+        with open(path.join(path.dirname(__file__), 'expected_config.json'))as json_file:
+            return json.load(json_file)