Use pytest instead of depricated setup.py

Author: mikemanger

tox.ini

@@ -10,10 +10,11 @@ env_list = py36, py37, py38, py39, py310, py311, py312, py313
 [testenv]
 install_command=pip install {packages}
 commands =
-    coverage run --source=lib setup.py test
+    coverage run --source=pytest
     coverage report
 deps =
     coverage
+    pytest
     -e.
 
 [gh]