add github action configuration for test jobs

.github/workflows/test.yml

@@ -0,0 +1,118 @@
+name: Test
+
+on:
+  - push
+  - pull_request
+
+jobs:
+
+  # Test different python versions with bash on Ubuntu.
+  ubuntu:
+    name: Test Ubuntu
+    runs-on: ubuntu-latest
+    if: ${{ !startsWith(github.ref, 'refs/tags') }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version:
+          - 3.8
+          - 3.9
+          - "3.10"
+          - "3.11"
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: python -m pip install tox
+
+      - name: Run tests
+        run: tox -e py
+
+  # Test the latest python version with zsh on macOS
+  zsh:
+    name: Test Zsh
+    runs-on: macos-latest
+    if: ${{ !startsWith(github.ref, 'refs/tags') }}
+
+    strategy:
+      fail-fast: false
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+
+      - name: Install dependencies
+        run: python -m pip install tox
+
+      - name: Run tests
+        run: tox -e zsh
+
+  # Test different python versions with bash on macOS
+  macos:
+    name: Test macOS
+    runs-on: macos-latest
+    if: ${{ !startsWith(github.ref, 'refs/tags') }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version:
+          - 3.8
+          - 3.9
+          - "3.10"
+          - "3.11"
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: python -m pip install tox
+
+      - name: Run tests
+        run: tox -e py
+
+  # Run various style checkers
+  style:
+    runs-on: ubuntu-latest
+    if: ${{ !startsWith(github.ref, 'refs/tags') }}
+
+    strategy:
+      fail-fast: false
+      tox-environment:
+          - docs
+          - style
+          - pkglint
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+
+      - name: Install dependencies
+        run: python -m pip install tox
+
+      - name: Run
+        run: tox -e ${{ matrix.tox-environment }}