Migrate from testr to stestr

* Replace .testr.conf by .stestr.conf for migration and update
  .gitignore and test-requirements.txt file accordingly
* Use py3 as the default runtime for tox and 3.18.0 as the
  minversion for tox, replace whitelist_externals
  by allowlist_externals

Change-Id: I7747c4ce8d95ce94e0750a3f964f0264fe491fce

.gitignore

@@ -16,7 +16,6 @@ doc/build
 adjutantclient/versioninfo
 *.egg-info
 *.log
-.testrepository
 .pypirc
 env/
 *~

.stestr.conf

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

.testr.conf

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

test-requirements.txt

@@ -8,7 +8,7 @@ discover # BSD
 fixtures>=3.0.0 # Apache-2.0/BSD
 requests-mock>=0.7.0 # Apache-2.0
 os-client-config>=1.13.1 # Apache-2.0
-testrepository>=0.0.18 # Apache-2.0/BSD
+stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=1.4.0 # MIT
 tempest>=11.0.0 # Apache-2.0

tox.ini

@@ -1,6 +1,6 @@
 [tox]
-minversion = 3.1
-envlist = py38
+minversion = 3.18.0
+envlist = py3
 skipsdist = True
 ignore_basepython_conflict = True
 
@@ -15,18 +15,25 @@ deps =
        -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-commands = ostestr {posargs}
+commands = stestr run --slowest {posargs}
 
-whitelist_externals = find
+allowlist_externals = find
 
 [testenv:pep8]
 commands = flake8
 
 [testenv:cover]
+allowlist_externals = find
+setenv =
+  {[testenv]setenv}
+  PYTHON=coverage run --source adjutantclient --parallel-mode
 commands =
   coverage erase
   find . -type f -name "*.pyc" -delete
-  python setup.py testr --coverage --testr-args='{posargs}'
+  stestr run {posargs}
+  coverage combine
+  coverage html -d cover
+  coverage xml -o cover/coverage.xml
   coverage report
 
 [testenv:venv]