ci: Test with tox command

.github/workflows/python-app.yml

@@ -25,11 +25,11 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8==3.8.4 pytest
+        pip install flake8==3.8.4 pytest tox
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |
         python setup.py lint
     - name: Test with pytest
       run: |
-        python setup.py test
+        tox

setup.py

@@ -4,19 +4,6 @@
 from setuptools.command.test import test as TestCommand, Command
 
 
-class PyTest(TestCommand):
-    def finalize_options(self):
-        TestCommand.finalize_options(self)
-        self.test_args = ["tests", "-s"]
-        self.test_suite = True
-
-    def run_tests(self):
-        import pytest
-
-        errno = pytest.main(self.test_args)
-        raise SystemExit(errno)
-
-
 class LintCommand(Command):
     """
     A copy of flake8's Flake8Command
@@ -96,7 +83,6 @@ def requirements():
         "pytest>=6.2,<7",
     ],
     cmdclass={
-        "test": PyTest,
         "lint": LintCommand,
     },
 )

tox.ini

@@ -0,0 +1,6 @@
+[tox]
+envlist = python3.9
+
+[testenv]
+deps = pytest
+commands = pytest tests -s