tests: Migrate to pytest

nose is not compatible with Python 3.10 or later and stestr can't handle
multiple test directories nor test directories that are not importable
modules.

While here, we also fix the case for two other dependencies to prevent
test failures. We also update the tox file to reflect modern best
practices.

Change-Id: Ie7b57b1f34957459793bcaa5253ce1b446e36336
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

test-requirements.txt

@@ -2,7 +2,7 @@ transaction
 pecan
 sphinx>=3.0.0 # BSD
 Flask
-flask-restful
+Flask-RESTful # BSD
-nose
+pytest # MIT
-coverage!=4.4,>=4.0 # Apache-2.0
+pytest-cov # MIT
-webtest
+WebTest # MIT

tox.ini

@@ -1,29 +1,23 @@
 [tox]
 minversion = 3.1
-envlist = py36,py37,py38,py39,pypy,coverage,pep8
+envlist = py3,coverage,pep8
-ignore_basepython_conflict = true
 
 [testenv]
-basepython = python3
-setenv =
-  COVERAGE_FILE=.coverage.{envname}
 deps =
   -r test-requirements.txt
 commands =
-  {envbindir}/coverage run {envbindir}/nosetests --nologcapture --with-xunit --xunit-file nosetests-{envname}.xml wsme/tests tests/pecantest tests/test_sphinxext.py tests/test_flask.py --verbose {posargs}
+  pytest wsme/tests tests/pecantest tests/test_sphinxext.py tests/test_flask.py
-  {envbindir}/coverage report --show-missing --include="wsme/*.py","wsme/rest/*.py","wsmeext/*.py" --omit "wsme/tests/*"
 
 [testenv:coverage]
-setenv =
-  COVERAGE_FILE=.coverage
 commands =
-  {envbindir}/coverage erase
+  coverage erase
-  {envbindir}/coverage combine
+  pytest --cov=wsme --cov=wsme_ext wsme/tests tests/pecantest tests/test_sphinxext.py tests/test_flask.py
-  {envbindir}/coverage xml --include="wsme/*.py","wsme/rest/*.py","wsmeext/*.py" --omit "wsme/tests/*"
+  coverage combine
-  {envbindir}/coverage report --show-missing --include="wsme/*.py","wsme/rest/*.py","wsmeext/*.py" --omit "wsme/tests/*"
+  coverage xml --include="wsme/*.py","wsme/rest/*.py","wsmeext/*.py" --omit "wsme/tests/*"
+  coverage report --show-missing --include="wsme/*.py","wsme/rest/*.py","wsmeext/*.py" --omit "wsme/tests/*"
 
 [testenv:docs]
-whitelist_externals =
+allowlist_externals =
   rm
 deps =
   -r doc/requirements.txt