Make the measuring code coverage test working

Change-Id: I9e28b3b08685ea7a7ae1ed73888d8160728f5ded
Signed-off-by: Gael Chamoulaud (Strider) <gchamoul@redhat.com>

.coveragerc

@@ -1,7 +1,7 @@
 [run]
 branch = True
-source = validations-libs
-omit = validations-libs/openstack/*
+source = validations_libs
+omit = validations_libs/tests/*
 
 [report]
 ignore_errors = True

.gitignore

@@ -29,7 +29,7 @@ cover/
 nosetests.xml
 .testrepository
 .venv
-.stestr/
+.stestr/*
 
 # Translations
 *.mo

.stestr.conf

@@ -1,3 +1,3 @@
 [DEFAULT]
-test_path=./validations_libs/tests
+test_path=${TEST_PATH:-./validations_libs/tests}
 top_dir=./

.zuul.yaml

@@ -22,6 +22,7 @@
     check:
       jobs:
         - openstack-tox-linters
+        - openstack-tox-cover
         - openstack-tox-docs: &tripleo-docs
             files:
               - ^doc/.*

test-requirements.txt

@@ -10,7 +10,7 @@ pyflakes>=2.1.1
 
 coverage!=4.4,>=4.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
-stestr>=1.0.0 # Apache-2.0
+stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 pre-commit # MIT

tox.ini

@@ -3,18 +3,27 @@ minversion = 3.2.0
 envlist = linters,docs,py38
 skipdist = True
 
+# Automatic envs (pyXX) will only use the python version appropriate to that
+# env and ignore basepython inherited from [testenv] if we set
+# ignore_basepython_conflict.
+ignore_basepython_conflict = True
+
 [testenv]
 usedevelop = True
-passenv = *
+passenv =
+  TERM
 setenv =
   # pip: Avoid 2020-01-01 warnings: https://github.com/pypa/pip/issues/6207
   # paramiko CryptographyDeprecationWarning: https://github.com/ansible/ansible/issues/52598
   PYTHONWARNINGS=ignore:DEPRECATION::pip._internal.cli.base_command,ignore::UserWarning
   PIP_DISABLE_PIP_VERSION_CHECK=1
+  VIRTUAL_ENV={envdir}
+  LANG=en_US.UTF-8
+  LANGUAGE=en_US:en
+  LC_ALL=C
+  HOME={envdir}
 commands =
-  stestr run {posargs}
-  stestr slowest
-sitepackages = True
+  stestr run --slowest --color {posargs}
 deps =
     -c {env:TOX_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
     -r {toxinidir}/requirements.txt
@@ -57,11 +66,21 @@ commands =
     {[testenv:whitespace]commands}
     {[testenv:shebangs]commands}
 
+[testenv:venv]
+commands = {posargs}
+passenv = *
+
 [testenv:cover]
-deps =
-    -r {toxinidir}/requirements.txt
-    -r {toxinidir}/test-requirements.txt
-commands = python setup.py test --coverage --testr-args='{posargs}'
+setenv =
+  PYTHON=coverage run --source validations_libs --parallel-mode
+  HOME={envdir}
+commands =
+  coverage erase
+  stestr run --color {posargs}
+  coverage combine
+  coverage html -d cover
+  coverage xml -o cover/coverage.xml
+  coverage report
 
 [testenv:docs]
 deps =