Add script for unit test coverage job

This patch will allow to run a non voting coverage job
which will detect any changes in the code coverage for
each commit on review.

Change-Id: Ie2bb1b23bb49f0f3b1a149b8e086c2a943f77508
Closes-Bug: 1655016

.coveragerc

@@ -0,0 +1,8 @@
+[run]
+source = mistralclient
+omit =
+ .tox/*
+ mistralclient/tests/*
+
+[report]
+ignore_errors = True

.zuul.yaml

@@ -35,6 +35,13 @@
       - release-notes-jobs-python3
     check:
       jobs:
+        - openstack-tox-cover:
+            voting: false
+            irrelevant-files:
+              - ^.zuul.yaml$
+              - ^.*\.rst$
+              - ^doc/.*$
+              - ^releasenotes/.*$
         - python-mistralclient-functional-devstack
         # TripleO jobs that deploy Mistral.
         # Note we don't use a project-template here, so it's easier

lower-constraints.txt

@@ -8,6 +8,7 @@ cffi==1.7.0
 cliff==2.8.0
 cmd2==0.8.0
 contextlib2==0.4.0
+coverage==4.0
 cryptography==2.1
 debtcollector==1.2.0
 decorator==3.4.0

mistralclient/tests/unit/test_httpclient.py

@@ -59,7 +59,6 @@ class HTTPClientTest(base.BaseClientTest):
 
     def setUp(self):
         super(HTTPClientTest, self).setUp()
-        osprofiler.profiler.init(None)
         self.client = httpclient.HTTPClient(
             API_BASE_URL,
             auth_token=AUTH_TOKEN,

test-requirements.txt

@@ -1,6 +1,7 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
+coverage>=4.0 # Apache-2.0
 hacking>=1.1.0,<1.2.0 # Apache-2.0
 python-openstackclient>=3.12.0 # Apache-2.0
 mock>=2.0.0 # BSD

tox.ini

@@ -21,6 +21,16 @@ commands =
     stestr run --concurrency 1 --slowest {posargs}
 whitelist_externals = find
                       rm
+[testenv:cover]
+setenv =
+    {[testenv]setenv}
+    PYTHON=coverage run --source mistralclient --parallel-mode
+commands =
+    stestr run {posargs}
+    coverage combine
+    coverage html -d cover
+    coverage xml -o cover/coverage.xml
+    coverage report
 [testenv:functional]
 setenv =
     TEST_PATH = ./mistralclient/tests/functional