Add workflow for testing.

Author: cokernel

.github/workflows/test.yml

@@ -0,0 +1,35 @@
+name: "Run tests"
+
+on:
+  push:
+    branches: [ $default-branch ]
+  pull-request:
+    branches: [ $default-branch ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.12", "3.13"]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install uv
+        uses: astral-sh/setup-uv@v6
+        with:
+          version: "latest"
+          enable-cache: true
+          cache-dependency-glob: uv.lock
+      - name: Install dependencies
+        run: |
+          uv sync --locked --all-extras --dev
+      - name: Run tests
+        run: |
+          uv run pytest