Add basic tests for message processing

Add tests checking that a JSON message will be correctly mapped to
their configured Prometheus client action.

This replaces the noop test that was just a noop.

Change-Id: I7362ad86fdc5dcb0a83b5173c3f20611577d0692

oslo_metrics/tests/test_message_process.py

+# -*- coding: utf-8 -*-
+
+# 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.
+
+"""
+test_message_process
+--------------------
+Check that messages are processed correctly
+"""
+
+from unittest import mock
+
+from oslo_metrics import message_router
+from oslotest import base
+import prometheus_client
+
+
+class TestProcessMessage(base.BaseTestCase):
+
+    def setUp(self):
+        super(TestProcessMessage, self).setUp()
+
+    def test_process_counter(self):
+        received_json = """{
+  "module": "oslo_messaging",
+  "name": "rpc_server_count_for_invocation_start",
+  "action": {
+    "action": "inc",
+    "value": null
+  },
+  "labels": {
+    "exchange": "foo",
+    "topic": "bar",
+    "server": "foobar",
+    "endpoint": "endpoint",
+    "namespace": "ns",
+    "version": "v2",
+    "method": "get",
+    "process": "done"
+  }
+}""".encode()
+
+        with mock.patch.object(
+            prometheus_client.Counter, 'inc',
+        ) as mock_inc:
+            router = message_router.MessageRouter()
+            router.process(received_json)
+            mock_inc.assert_called_once_with()
+
+    def test_process_histogram(self):
+        received_json = """{
+  "module": "oslo_messaging",
+  "name": "rpc_client_processing_time",
+  "action": {
+    "action": "observe",
+    "value": 1.26
+  },
+  "labels": {
+    "call_type": "call",
+    "exchange": "foo",
+    "topic": "bar",
+    "server": "foobar",
+    "namespace": "ns",
+    "version": "v2",
+    "process": "done",
+    "fanout": "foo"
+  }
+}""".encode()
+
+        with mock.patch.object(
+            prometheus_client.Histogram, 'observe',
+        ) as mock_inc:
+            router = message_router.MessageRouter()
+            router.process(received_json)
+            mock_inc.assert_called_once_with(1.26)

oslo_metrics/tests/test_noop.py

-# -*- coding: utf-8 -*-
-
-# 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.
-
-"""
-test_noop
-----------------------------------
-A test that always reports success.
-"""
-
-from oslotest import base
-
-
-class TestNoop(base.BaseTestCase):
-
-    def setUp(self):
-        super(TestNoop, self).setUp()
-
-    def test_always_success(self):
-        self.assertEqual(1, 1)