ci: implement ci workflow and basic tests

.github/workflows/ci.yml

@@ -0,0 +1,56 @@
+---
+name: CI
+
+on:
+  pull_request:
+    branches: [master]
+    types: [opened, synchronize, reopened]
+  push:
+    branches: [master]
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  pytest:
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-11
+          - macos-12
+          - windows-2019
+          - windows-2022
+          - ubuntu-20.04
+          - ubuntu-22.04
+        python: ["2.7", "3.8", "3.9", "3.10", "3.11"]
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Python
+        id: python
+        uses: ./
+        with:
+          python-version: ${{ matrix.python }}
+
+      - name: Install Python Dependencies
+        run: |
+          python -m pip install --upgrade pip setuptools wheel
+          python -m pip install --upgrade -r requirements-dev.txt
+
+      - name: Test with pytest
+        id: test
+        env:
+          INPUT_PYTHON_VERSION: ${{ matrix.python }}
+        shell: bash
+        run: |
+          python -m pytest \
+            -rxXs \
+            --tb=native \
+            --verbose \
+            tests

requirements-dev.txt

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+pytest==4.6.11;python_version<"3.5"
+pytest==6.1.2;python_version>="3.5" and python_version<"3.6"
+pytest==7.0.1;python_version>="3.6" and python_version<"3.7"
+pytest==7.4.2;python_version>="3.7"

tests/conftest.py

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+# -*- coding: utf-8 -*-
+# standard imports
+import os
+
+# lib imports
+import pytest
+
+
+@pytest.fixture(scope='session')
+def input_python_version():
+    return os.environ.get('INPUT_PYTHON_VERSION')

tests/functional/test_python.py

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+# -*- coding: utf-8 -*-
+# standard imports
+import platform
+import sys
+
+
+def test_python_platform_version(input_python_version):
+    assert platform.python_version().startswith(input_python_version)
+
+
+def test_python_system_version(input_python_version):
+    assert sys.version.startswith(input_python_version)