Added Actuator Strategy

This strategy now allow us to create action plans with an explicit
set of actions.

Co-Authored-By: Mikhail Kizilov <kizilov.mikhail@gmail.com>
Change-Id: I7b04b9936ce5f3b5b38f319da7f8737e0f3eea88
Closes-Bug: #1659243

watcher/tests/decision_engine/strategy/strategies/test_actuator.py

@@ -0,0 +1,37 @@
+# -*- encoding: utf-8 -*-
+# Copyright (c) 2017 b<>com
+#
+# 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 mock
+
+from watcher.common import utils
+from watcher.decision_engine.strategy import strategies
+from watcher.tests import base
+
+
+class TestActuator(base.TestCase):
+
+    def setUp(self):
+        super(TestActuator, self).setUp()
+        # fake cluster
+        self.strategy = strategies.Actuator(config=mock.Mock())
+
+    def test_actuator_strategy(self):
+        fake_action = {"action_type": "TEST", "input_parameters": {"a": "b"}}
+        self.strategy.input_parameters = utils.Struct(
+            {"actions": [fake_action]})
+        solution = self.strategy.execute()
+        self.assertEqual(1, len(solution.actions))
+        self.assertEqual([fake_action], solution.actions)