Migrate from testr to stestr

* Replace .testr.conf by .stestr.conf for migration and update
  .gitignore and test-requirements.txt files accordingly
* Use 3.18.0 as the minversion for tox
* Add a new job, openstack-cover-jobs, to run the coverage in Zuul
* Create cover environment in tox and make relevant changes
  in .gitignore and test-requirements.txt

Signed-off-by: HeroicHitesh <email.hiteshkumar@gmail.com>
Change-Id: I2bb0f23771e6ff1e3f775520a719514c2a3f3aa3

.gitignore

@@ -1,7 +1,33 @@
-heat_specs.egg-info/
-doc/build/
-.tox/
 *.pyc
-.testrepository
+
+# Packages
+*.egg*
+*.egg-info
+dist
+build
+
+# Unit test / coverage reports
+cover/
+.coverage*
+!.coveragerc
+.tox/
+.stestr/
+.venv
+
+# Mr Developer
+.project
+.pydevproject
+
+# Sphinx
+doc/build/
+
+# pbr generates these
 AUTHORS
 ChangeLog
+
+# Editors
+*.swp
+*~
+
+# Files created by releasenotes build
+releasenotes/build

.stestr.conf

@@ -0,0 +1,3 @@
+[DEFAULT]
+test_path=./tests/
+top_dir=./

.testr.conf

@@ -1,4 +0,0 @@
-[DEFAULT]
-test_command=OS_STDOUT_CAPTURE=1 OS_STDERR_CAPTURE=1 OS_TEST_TIMEOUT=60 ${PYTHON:-python} -m subunit.run discover -t ./ . $LISTOPT $IDOPTION
-test_id_option=--load-list $IDFILE
-test_list_option=--list

.zuul.yaml

@@ -1,6 +1,7 @@
 - project:
     templates:
       - openstack-specs-jobs
+      - openstack-cover-jobs
     check:
       jobs:
         - openstack-tox-py38

test-requirements.txt

@@ -1,3 +1,4 @@
-testrepository>=0.0.18
+coverage>=4.0 # Apache-2.0
+stestr>=2.0.0 # Apache-2.0
 testtools>=0.9.34
 testscenarios>=0.4

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-minversion = 1.6
+minversion = 3.18.0
 envlist = docs,pep8
 skipsdist = True
 
@@ -10,14 +10,28 @@ setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-whitelist_externals = find
+allowlist_externals = find
 commands =
   find . -type f -name "*.pyc" -delete
-  python setup.py testr --slowest --testr-args='{posargs}'
+  stestr run --slowest {posargs}
 
 [testenv:venv]
 commands = {posargs}
 
+[testenv:cover]
+basepython = python3
+allowlist_externals = find
+setenv =
+  PYTHON=coverage run --source . --parallel-mode
+commands =
+  coverage erase
+  find . -type f -name "*.pyc" -delete
+  stestr run {posargs}
+  coverage combine
+  coverage html -d cover
+  coverage xml -o cover/coverage.xml
+  coverage report
+
 [testenv:docs]
 commands = sphinx-build -W -a -b html doc/source doc/build/html