Special-case Alt Linux in tests (#88)

* Run tests on ALT Linux via GitHub Actions

* Split asyncio test into altlinux and the rest.

* Lint

* De-duplicate code in test_import_tools.py

Author: domdfcoding

.github/workflows/python_ci_alt_linux.yml

@@ -0,0 +1,65 @@
+# This file is managed by 'repo_helper'. Don't edit it directly.
+---
+name: ALT Linux
+
+on:
+  push:
+    branches-ignore:
+      - 'repo-helper-update'
+      - 'pre-commit-ci-update-config'
+      - 'imgbot'
+    tags:
+      - '*'
+  pull_request:
+
+permissions:
+  actions: write
+  issues: write
+  contents: read
+
+jobs:
+  tests:
+    name: "alt-linux / Python ${{ matrix.config.python-version }}"
+    runs-on: "ubuntu-20.04"
+    container:
+     image: ghcr.io/domdfcoding/alt-linux-python:latest
+    continue-on-error: ${{ matrix.config.experimental }}
+    env:
+      USING_COVERAGE: '3.10'
+
+    strategy:
+      fail-fast: False
+      matrix:
+        config:
+          - {python-version: "3.10", testenvs: "py310,build", experimental: False}
+
+    steps:
+      - name: Checkout 🛎️
+        uses: "actions/checkout@v3"
+
+      - name: "Configure"
+        run: git config --global --add safe.directory /__w/${{ github.event.repository.name }}/${{ github.event.repository.name }}
+
+      - name: Check for changed files
+        if: startsWith(github.ref, 'refs/tags/') != true
+        uses: dorny/paths-filter@v2
+        id: changes
+        with:
+          list-files: "json"
+          filters: |
+            code:
+              - '!(doc-source/**|CONTRIBUTING.rst|.imgbotconfig|.pre-commit-config.yaml|.pylintrc|.readthedocs.yml)'
+
+      - name: Install dependencies 🔧
+        id: setup-python
+        if: ${{ steps.changes.outputs.code == 'true' || steps.changes.outcome == 'skipped' }}
+        run: |
+          python3 -VV
+          python3 -m site
+          python3 -m pip install --upgrade pip setuptools wheel
+          python3 -m pip install --upgrade tox virtualenv!=20.16.0
+          python3 -m pip install --upgrade coverage_pyver_pragma
+
+      - name: "Run Tests for Python ${{ matrix.config.python-version }}"
+        if: steps.setup-python.outcome == 'success'
+        run: python3 -m tox -e "${{ matrix.config.testenvs }}" -s false

tests/test_import_tools.py

@@ -1,5 +1,7 @@
 # stdlib
 import inspect
+import platform
+import re
 import sys
 from contextlib import contextmanager
 
@@ -124,7 +126,7 @@ def test_discover_entry_points_by_name_name_match_func(advanced_data_regression:
 	advanced_data_regression.check({k: v.__name__ for k, v in entry_points.items()})
 
 
-@pytest.mark.parametrize(
+iter_submodules_versions = pytest.mark.parametrize(
 		"version",
 		[
 				pytest.param(3.6, marks=only_version(3.6, reason="Output differs on Python 3.6")),
@@ -173,18 +175,78 @@ def test_discover_entry_points_by_name_name_match_func(advanced_data_regression:
 				pytest.param("3.10", marks=only_version("3.10", reason="Output differs on Python 3.10")),
 				]
 		)
+
+
+@iter_submodules_versions
 @pytest.mark.parametrize(
 		"module",
-		[
-				"collections",
-				"importlib",
-				"domdf_python_tools",
-				"consolekit",
-				"asyncio",
-				"json",
-				"cRQefleMvm",
-				"reprlib"
-				],
+		["collections", "importlib", "domdf_python_tools", "consolekit", "json", "cRQefleMvm", "reprlib"],
 		)
 def test_iter_submodules(version, module: str, advanced_data_regression: AdvancedDataRegressionFixture):
 	advanced_data_regression.check(list(iter_submodules(module)))
+
+
+if sys.version_info < (3, 10):
+	# From https://github.com/python/cpython/blob/main/Lib/platform.py#L1319
+	# License: https://github.com/python/cpython/blob/main/LICENSE
+
+	### freedesktop.org os-release standard
+	# https://www.freedesktop.org/software/systemd/man/os-release.html
+
+	# NAME=value with optional quotes (' or "). The regular expression is less
+	# strict than shell lexer, but that's ok.
+	_os_release_line = re.compile("^(?P<name>[a-zA-Z0-9_]+)=(?P<quote>[\"']?)(?P<value>.*)(?P=quote)$")
+	# unescape five special characters mentioned in the standard
+	_os_release_unescape = re.compile(r"\\([\\\$\"\'`])")
+	# /etc takes precedence over /usr/lib
+	_os_release_candidates = ("/etc/os-release", "/usr/lib/os-release")
+
+	def freedesktop_os_release():
+		"""
+		Return operation system identification from freedesktop.org os-release
+		"""
+
+		errno = None
+		for candidate in _os_release_candidates:
+			try:
+				with open(candidate, encoding="utf-8") as f:
+					info = {"ID": "linux"}
+
+					for line in f:
+						mo = _os_release_line.match(line)
+						if mo is not None:
+							info[mo.group("name")] = _os_release_unescape.sub(r"\1", mo.group("value"))
+
+					return info
+
+			except OSError as e:
+				errno = e.errno
+
+		raise OSError(errno, f"Unable to read files {', '.join(_os_release_candidates)}")
+
+else:
+	freedesktop_os_release = platform.freedesktop_os_release
+
+on_alt_linux = False
+
+if platform.system() == "Linux":
+	try:
+		on_alt_linux = freedesktop_os_release()["ID"] == "altlinux"
+	except OSError:
+		pass
+
+
+@iter_submodules_versions
+@pytest.mark.parametrize(
+		"platform",
+		[
+				pytest.param('', marks=pytest.mark.skipif(on_alt_linux, reason="Not for ALT Linux")),
+				pytest.param("altlinux", marks=pytest.mark.skipif(not on_alt_linux, reason="Only for ALT Linux")),
+				]
+		)
+def test_iter_submodules_asyncio(
+		platform,
+		version,
+		advanced_data_regression: AdvancedDataRegressionFixture,
+		):
+	advanced_data_regression.check(list(iter_submodules("asyncio")))