🔧 Template: Add tests job to CI workflow

We choose to only test against the min and max Python versions supported, and run the
provided Hatch script for running the tests.

Note that we pin `click==8.1.8` because `8.3.0` breaks Hatch, `8.2.2` has been
yanked, and `8.1.8` is the latest version that supports Python 3.9.

Author: mbercx

README.md

@@ -11,7 +11,7 @@ Template for Python packages based on [`copier`](https://copier.readthedocs.io/e
 * 🧹 **Pre-commit**: Format and lint your code with [Ruff](https://docs.astral.sh/ruff/).
 * ⚙️ **GitHub Actions**:
     * Deploy documentation to [GitHub Pages](https://docs.github.com/en/pages/getting-started-with-github-pages/creating-a-github-pages-site).
-    * Run pre-commit checks on every pull request.
+    * Run pre-commit checks and tests on every pull request.
 
 ## Usage
 

docs/index.md

@@ -9,7 +9,7 @@ A `copier`-based template for Python packages.
 * 🧹 **Pre-commit**: Format and lint your code with [Ruff](https://docs.astral.sh/ruff/).
 * ⚙️ **GitHub Actions**:
     * Deploy documentation to [GitHub Pages](https://docs.github.com/en/pages/getting-started-with-github-pages/creating-a-github-pages-site).
-    * Run pre-commit checks on every pull request.
+    * Run pre-commit checks and tests on every pull request.
 
 ## Usage
 

template/.github/workflows/.ci.yml

@@ -14,7 +14,21 @@ jobs:
           python-version: '3.13'
 
       - name: Install Hatch
-        run: pip install click==8.2.1 hatch
+        run: pip install click==8.1.8 hatch
 
       - name: Run pre-commit
         run: hatch run precommit:run
+
+  tests:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.9', '3.13']
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - run: pip install click==8.2.1 hatch
+      - run: hatch run test:run