Add tests to GitHub Actions CI/CD workflow

.github/workflows/python-tests.yml

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+name: >-
+  👷
+  Test suite
+
+on:
+  push:
+  pull_request:
+  schedule:
+  # Run daily at 0:01 UTC
+  # https://crontab.guru/#1_0_*_*_*
+  - cron: 1 0 * * *
+
+jobs:
+  tests:
+    name: >-
+      ${{ matrix.python-version }}
+      /
+      ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      # max-parallel: 5
+      matrix:
+        python-version:
+        - 3.8
+        - 2.7
+        - pypy3
+        - 3.7
+        - 3.6
+        - 3.5
+        - pypy2
+        os:
+        - ubuntu-latest
+        - ubuntu-16.04
+        - macOS-latest
+        - windows-latest
+        - windows-2016
+        tox-addargs:
+        - -m unit
+        - -m integration -n auto --duration=5 -k "not test_install"
+        - -m integration -n auto --duration=5 -k "test_install"
+        exclude:
+        - python-version: pypy3
+        - os: macOS-latest
+          python-version: pypy2
+        - os: windows-latest
+        - os: windows-2016
+
+    env:
+      TOX_PARALLEL_NO_SPINNER: 1
+      TOXENV: python
+      USE_VENV_ARG: --use-venv
+
+    steps:
+    - uses: actions/checkout@master
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v1
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Log Python version
+      run: >-
+        python --version
+    - name: Log Python location
+      run: >-
+        which python
+    - name: Log Python env
+      run: >-
+        python -m sysconfig
+    - name: Pip cache
+      uses: actions/cache@v1
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('tools/requirements/tests.txt') }}-${{ hashFiles('tools/requirements/docs.txt') }}-${{ hashFiles('tox.ini') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-
+          ${{ runner.os }}-
+    - name: Pre-configure global Git settings
+      run: |
+        git config --global user.email "[email protected]"
+        git config --global user.name "pip"
+    - name: Update setuptools
+      run: >-
+        python -m pip install --upgrade setuptools
+    - name: Install tox
+      run: >-
+        python -m pip install --upgrade tox tox-venv
+    - name: Set up certify on Windows
+      if: runner.os == 'Windows'
+      run: |
+        python -m pip install --upgrade certifi
+        echo "::set-env name=GIT_SSL_CAINFO::$(python -m certifi)"
+    - name: Log the list of packages
+      run: >-
+        python -m pip freeze --all
+    - name: Adjust TOXENV for PyPy
+      if: startsWith(matrix.python-version, 'pypy')
+      run: >-
+        echo "::set-env name=TOXENV::${{ matrix.python-version }}"
+    - name: >-
+        Empty USE_VENV_ARG unconditionally
+      # FIXME: was "... unless Python is 3.6 or 2.7"
+      # FIXME: if: >-
+      # FIXME:   runner.os == 'Windows'
+      # FIXME:   && matrix.python-version != 3.6
+      # FIXME:   && matrix.python-version != 2.7
+      run: >-
+        echo "::set-env name=USE_VENV_ARG::"
+    - name: 'Initialize tox envs: ${{ matrix.env.TOXENV }}'
+      run: >-
+        python -m
+        tox
+        --parallel auto
+        --notest
+        --skip-missing-interpreters false
+    - name: Set NETWORK_REQUIRED
+      run: >-
+        echo "::set-env name=NETWORK_REQUIRED::1"
+    - name: Log special env vars
+      shell: python
+      run: |
+        import os
+        print(
+            'USE_VENV_ARG={}\n'
+            'NETWORK_REQUIRED={}\n'
+            'GIT_SSL_CAINFO={}\n'.
+            format(
+                os.getenv('USE_VENV_ARG'),
+                os.getenv('NETWORK_REQUIRED'),
+                os.getenv('GIT_SSL_CAINFO'),
+            )
+        )
+    - name: Test with tox
+      run: >-
+        python -m
+        tox
+        --parallel auto
+        --
+        ${{ env.USE_VENV_ARG }} ${{ matrix.tox-addargs }}

news/6953-gh-actions--tests.trivial

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+Add a GitHub Actions workflow running all tests.