Add Voluptuous to validate the action parameters

We want a simplest way to validate the input parameters of an
Action through a schema.

APIImpact
DocImpact
Partially implements: blueprint watcher-add-actions-via-conf

Change-Id: I139775f467fe7778c7354b0cfacf796fc27ffcb2

watcher/tests/applier/actions/test_change_nova_service_state.py

@@ -0,0 +1,54 @@
+# -*- encoding: utf-8 -*-
+# Copyright (c) 2016 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 voluptuous
+
+from watcher.applier.actions import base as baction
+from watcher.applier.actions import change_nova_service_state
+from watcher.decision_engine.model import hypervisor_state as hstate
+from watcher.tests import base
+
+
+class TestChangeNovaServiceState(base.TestCase):
+    def setUp(self):
+        super(TestChangeNovaServiceState, self).setUp()
+        self.a = change_nova_service_state.ChangeNovaServiceState()
+
+    def test_parameters_down(self):
+        self.a.input_parameters = {
+            baction.BaseAction.RESOURCE_ID: "compute-1",
+            self.a.STATE: hstate.HypervisorState.OFFLINE.value}
+        self.assertEqual(True, self.a.validate_parameters())
+
+    def test_parameters_up(self):
+        self.a.input_parameters = {
+            baction.BaseAction.RESOURCE_ID: "compute-1",
+            self.a.STATE: hstate.HypervisorState.ONLINE.value}
+        self.assertEqual(True, self.a.validate_parameters())
+
+    def test_parameters_exception_wrong_state(self):
+        self.a.input_parameters = {
+            baction.BaseAction.RESOURCE_ID: "compute-1",
+            self.a.STATE: 'error'}
+        self.assertRaises(voluptuous.Invalid, self.a.validate_parameters)
+
+    def test_parameters_resource_id_empty(self):
+        self.a.input_parameters = {
+            self.a.STATE: None}
+        self.assertRaises(voluptuous.Invalid, self.a.validate_parameters)
+
+    def test_parameters_applies_add_extra(self):
+        self.a.input_parameters = {"extra": "failed"}
+        self.assertRaises(voluptuous.Invalid, self.a.validate_parameters)