ci: Add test action

.github/workflows/test.yml

@@ -0,0 +1,54 @@
+name: Test
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  test:
+    name: Generate and test (Python ${{ matrix.python-version }})
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ['3.9', '3.10', '3.11', '3.12']
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install jinja2
+
+      - name: Generate message definitions
+        run: generate/generate-python.py --output-dir=brping
+
+      - name: Verify core generated files exist
+        run: |
+          for f in definitions.py device.py ping1d.py ping360.py; do
+            test -s "brping/$f" || { echo "Missing or empty generated file: brping/$f"; exit 1; }
+          done
+
+      - name: Install package
+        run: pip install .
+
+      - name: Check generated code compiles
+        run: python -m compileall -q brping
+
+      - name: Check package imports
+        run: python -c "import brping; print('brping imported successfully')"
+
+      - name: Test message API
+        run: python brping/pingmessage.py