ci: test that package works

Author: dzhang32

.github/workflows/test.yml

@@ -0,0 +1,43 @@
+name: test-cookiecutter-template
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    env:
+      PYTHON_VERSION: "3.13"
+      # Matches the default in the cookiecutter.json.
+      DEFAULT_PACKAGE_NAME: "package_name"
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - name: Create cookiecutter package 
+        run: |
+          python -m pip install --upgrade pip
+          pip install cookiecutter
+          cookiecutter . --no-input
+
+      - name: Test cookiecutter package
+        run: |
+          cd ${{ env.DEFAULT_PACKAGE_NAME }}
+          python -m venv .venv
+          source .venv/bin/activate
+          pip install -e ".[dev]"
+          # Make sure unit tests pass.
+          pytest
+          # Check the CLI works.
+          ${{ env.DEFAULT_PACKAGE_NAME }} --help