Add support for Python 3.10

.github/workflows/smoke_test.yml

@@ -13,7 +13,7 @@ jobs:
   build_and_test:
     strategy:
       matrix:
-        python-version: [3.8, 3.9]  # oldest and most recent version supported
+        python-version: [3.8, '3.10']  # oldest and most recent version supported
     name: Build and smoke test
     runs-on: ubuntu-20.04
     steps:

.github/workflows/test_suite.yml

@@ -13,7 +13,7 @@ jobs:
   build_and_test:
     strategy:
       matrix:
-        python-version: [3.8, 3.9]  # oldest and most recent version supported
+        python-version: [3.8, '3.10']  # oldest and most recent version supported
     name: Run Python test suite
     runs-on: ubuntu-20.04
     steps:

binary_gentoo/internal/cli/tests/test_packages.py

@@ -2,6 +2,7 @@
 # Licensed under GNU Affero GPL version 3 or later
 
 import os
+import sys
 from io import StringIO
 from tempfile import TemporaryDirectory
 from textwrap import dedent
@@ -240,7 +241,10 @@ def test_help(self, *argv):  # plain smoke test
             with self.assertRaises(SystemExit) as catcher:
                 main()
             self.assertEqual(catcher.exception.args, (0, ))  # i.e. success
-            self.assertIn('optional arguments:', stdout_mock.getvalue())
+            if sys.version_info >= (3, 10):
+                self.assertIn('options:', stdout_mock.getvalue())
+            else:
+                self.assertIn('optional arguments:', stdout_mock.getvalue())
 
     def test_list_failure_empty_directory(self):  # just something that touches beyond argparse
         with TemporaryDirectory() as tempdir:

setup.py

@@ -54,5 +54,6 @@
             'Programming Language :: Python :: 3',
             'Programming Language :: Python :: 3.8',
             'Programming Language :: Python :: 3.9',
+            'Programming Language :: Python :: 3.10',
             'Programming Language :: Python :: 3 :: Only',
         ])