Tempest API tests on /actions

Following the blueprint tempest-basic-set-up which implemented a first
batch of tests, this one adds a new set of API tests on actions.

I also added extra check on actions within the dummy strategy
scenario.

Change-Id: Ib9bf093d0ed457ecba32e8251c019d2cf5c98128
Closes-Bug: #1538074

watcher_tempest_plugin/tests/scenario/test_execute_dummy_optim.py

@@ -17,6 +17,7 @@
 
 from __future__ import unicode_literals
 
+import collections
 import functools
 
 from tempest import test
@@ -62,6 +63,16 @@ class TestExecuteDummyStrategy(base.BaseInfraOptimScenarioTest):
             sleep_for=.5
         ))
         _, finished_ap = self.client.show_action_plan(action_plan['uuid'])
+        _, action_list = self.client.list_actions(
+            action_plan_uuid=finished_ap["uuid"])
+
+        action_counter = collections.Counter(
+            act['action_type'] for act in action_list['actions'])
 
         self.assertIn(updated_ap['state'], ('TRIGGERED', 'ONGOING'))
         self.assertEqual(finished_ap['state'], 'SUCCEEDED')
+
+        # A dummy strategy generates 2 "nop" actions and 1 "sleep" action
+        self.assertEqual(len(action_list['actions']), 3)
+        self.assertEqual(action_counter.get("nop"), 2)
+        self.assertEqual(action_counter.get("sleep"), 1)