Automatically run test files with pytest (#9576)

* Switch to pytest

git grep -l unittest.main | xargs sed -i 's/unittest.main()/sys.exit(pytest.main([__file__]))/g'
git ls-files -m | xargs -I {} sh -c "echo 'import sys\nimport pytest' >> '{}'"
isort --float-to-top .

* add pytest dep

* use sys.argv

certbot-dns-luadns/setup.py

@@ -30,6 +30,10 @@ docs_extras = [
     'sphinx_rtd_theme',
 ]
 
+test_extras = [
+    'pytest',
+]
+
 setup(
     name='certbot-dns-luadns',
     version=version,
@@ -65,6 +69,7 @@ setup(
     install_requires=install_requires,
     extras_require={
         'docs': docs_extras,
+        'test': test_extras,
     },
     entry_points={
         'certbot.plugins': [

certbot-dns-luadns/tests/dns_luadns_test.py

@@ -1,8 +1,10 @@
 """Tests for certbot_dns_luadns._internal.dns_luadns."""
 
+import sys
 import unittest
 from unittest import mock
 
+import pytest
 from requests.exceptions import HTTPError
 
 from certbot.compat import os
@@ -49,4 +51,4 @@ class LuaDNSLexiconClientTest(unittest.TestCase, dns_test_common_lexicon.BaseLex
 
 
 if __name__ == "__main__":
-    unittest.main()  # pragma: no cover
+    sys.exit(pytest.main(sys.argv[1:] + [__file__]))  # pragma: no cover