diff --git a/.github/workflows/mac-m1.yml b/.github/workflows/mac-m1.yml
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+# https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
+# TODO: add `python -m pytest --doctest-modules`
+
+name: Mac M1 test
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_call:
+
+permissions:
+  contents: read # to fetch code (actions/checkout)
+
+jobs:
+  lint-python:
+    name: Lint Python
+    runs-on: macos-14
+    steps:
+    - uses: actions/checkout@v4
+    - run: |
+        pip install --user ruff
+        python3 -m ruff --output-format=github --select="E,F,PLC,PLE,UP,W,YTT" --ignore="E721,PLC1901,S101,UP031" --target-version=py38 .
+  
+  lint-js:
+    name: Lint JS
+    runs-on: macos-14
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v4
+    - name: Use Node.js 20.x
+      uses: actions/setup-node@v4
+      with:
+        node-version: 20.x
+    - name: Install Dependencies
+      run: npm install
+    - name: Lint
+      run: npm run lint
+
+  check-engines:
+    name: Check Engines
+    runs-on: macos-14
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v4
+    - name: Use Node.js 20.x
+      uses: actions/setup-node@v4
+      with:
+        node-version: 20.x
+    - name: Install Dependencies
+      run: npm install
+    - name: Check Engines
+      run: |
+        # TODO: move this to its own action
+        npm install @npmcli/arborist@7 semver@7 --no-save
+        node .github/scripts/check-engines.js
+
+  test-pack:
+    name: Test Pack
+    runs-on: macos-14
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v4
+    - name: Use Node.js 20.x
+      uses: actions/setup-node@v4
+      with:
+        node-version: 20.x
+    - name: Update npm
+      run: npm install npm@latest -g
+    - name: Install Dependencies
+      run: npm install
+    - name: Pack
+      id: pack
+      env:
+        NODE_GYP_TEMP_DIR: '${{ runner.temp }}/node-gyp'
+      run: |
+        mkdir -p $NODE_GYP_TEMP_DIR
+        npm pack
+        tar xzf *.tgz -C $NODE_GYP_TEMP_DIR --strip-components=1
+        cp -r test/ $NODE_GYP_TEMP_DIR/test/
+        echo "dir=$NODE_GYP_TEMP_DIR" >> "$GITHUB_OUTPUT"
+    - name: Test
+      working-directory: ${{ steps.pack.outputs.dir }}
+      env:
+        FULL_TEST: '1'
+      run: |
+        npm install
+        # npm test  # Why is this running Windows tests on macOS?
+
+  tests:
+    # lint-python takes ~5 seconds, so wait for it to pass before running the full matrix of tests.
+    needs: [lint-python] 
+    strategy:
+      fail-fast: false
+      max-parallel: 15
+      matrix:
+        os: [macos-14]
+        python: ["3.8", "3.10", "3.12"]
+        node: [16.x, 18.x, 20.x]
+    name: ${{ matrix.os }} - ${{ matrix.python }} - ${{ matrix.node }}
+    runs-on: macos-14
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+      - name: Use Node.js ${{ matrix.node }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+      - name: Use Python ${{ matrix.python }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python }}
+        env:
+          PYTHON_VERSION: ${{ matrix.python }}  # Why do this?
+      - name: Install Dependencies
+        run: |
+          npm install
+          pip install pytest
+      - name: Run Python Tests
+        run: python -m pytest
+      - name: Run Tests (macOS or Linux)
+        shell: bash
+        run: npm test --python="${pythonLocation}/python"
+        env:
+          FULL_TEST: ${{ (matrix.node == '20.x' && matrix.python == '3.12') && '1' || '0' }}