Add coverage configuration for tox

Change-Id: I0b2366116d0191e2189db3d9439f1b17cb9f38af

.coveragerc

@@ -0,0 +1,11 @@
+[run]
+branch = True
+source = ironic_prometheus_exporter
+omit = *tests*
+
+[report]
+ignore_errors = True
+omit = *tests*
+
+[html]
+directory = cover

.zuul.yaml

@@ -87,6 +87,7 @@
       - openstack-python3-victoria-jobs
       - release-notes-jobs-python3
       - publish-openstack-docs-pti
+      - openstack-cover-jobs
     check:
       jobs:
         - ironic-prometheus-exporter-redfish

lower-constraints.txt

@@ -8,6 +8,7 @@ chardet==3.0.4
 click==7.1.1
 cliff==3.1.0
 cmd2==0.8.9
+coverage==4.0
 cryptography==2.9
 debtcollector==2.0.0
 decorator==4.4.2
@@ -95,4 +96,4 @@ WebOb==1.8.6
 Werkzeug==1.0.1
 wrapt==1.12.1
 yappi==1.2.3
-zipp==3.1.0
+zipp==3.1.0

test-requirements.txt

@@ -4,3 +4,4 @@ flake8
 flake8-import-order>=0.17.1
 stestr>=2.0.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
+coverage!=4.4,>=4.0 # Apache-2.0

tox.ini

@@ -22,6 +22,18 @@ commands = stestr run {posargs}
 [testenv:pep8]
 commands = flake8 {posargs}
 
+[testenv:cover]
+setenv =
+    PYTHON=coverage run --parallel-mode
+
+commands =
+  coverage erase
+  stestr run {posargs}
+  coverage combine
+  coverage report
+  coverage html
+  coverage xml -o cover/coverage.xml
+
 [testenv:releasenotes]
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}