Switch to stestr for unit tests

Moves coverage to a separate test environment and CI job.

Change-Id: I94697ba41afbae194136202dfab349eb0367a125

.gitignore

@@ -24,7 +24,7 @@ develop-eggs
 # Other
 *.DS_Store
 .idea
-.testrepository
+.stestr
 .tox
 .venv
 .*.swp

.stestr.conf

@@ -0,0 +1,2 @@
+[DEFAULT]
+test_path=./metalsmith/test

.zuul.yaml

@@ -172,6 +172,7 @@
       - openstack-python35-jobs
       - openstack-python36-jobs
       - openstack-lower-constraints-jobs
+      - openstack-cover-jobs
       - docs-on-readthedocs
     vars:
       rtd_webhook_id: '37378'

lower-constraints.txt

@@ -54,6 +54,7 @@ requestsexceptions==1.4.0
 restructuredtext-lint==1.1.3
 simplejson==3.15.0
 six==1.10.0
+stestr==1.0.0
 stevedore==1.28.0
 testtools==2.2.0
 traceback2==1.4.0

test-requirements.txt

@@ -7,5 +7,6 @@ flake8-import-order>=0.13 # LGPLv3
 fixtures>=3.0.0 # Apache-2.0/BSD
 hacking>=1.0.0 # Apache-2.0
 mock>=2.0 # BSD
+stestr>=1.0.0 # Apache-2.0
 testtools>=2.2.0 # MIT
 Pygments>=2.2.0 # BSD

tox.ini

@@ -3,16 +3,30 @@ envlist = py3,py27,pep8
 
 [testenv]
 usedevelop = True
+setenv = VIRTUAL_ENV={envdir}
+         LANGUAGE=en_US
+         LC_ALL=en_US.UTF-8
+         PYTHONWARNINGS=default::DeprecationWarning
+         PYTHONDONTWRITEBYTECODE=1
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
     -r{toxinidir}/requirements.txt
     -r{toxinidir}/test-requirements.txt
 commands =
-    coverage run --branch --include "metalsmith*" -m unittest discover metalsmith.test
-    coverage report -m --fail-under 90
-setenv = PYTHONDONTWRITEBYTECODE=1
+    stestr run {posargs}
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
+[testenv:cover]
+basepython = python3
+setenv = {[testenv]setenv}
+         PYTHON=coverage run --branch --source metalsmith --parallel-mode
+commands =
+  coverage erase
+  stestr run {posargs}
+  coverage combine
+  coverage report -m --fail-under 90
+  coverage html -d ./cover --omit='*test*'
+
 [testenv:venv]
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}