add dev container and tests

.devcontainer/Dockerfile

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+ARG IMAGE="python:3.12"
+FROM --platform=amd64 mcr.microsoft.com/vscode/devcontainers/${IMAGE}
+RUN apt-get update \
+    && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends build-essential libssl-dev gdb cmake

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/python
+{
+    "name": "Cookie Cutter - Render Engine",
+    // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+    "build": {
+        "dockerfile": "Dockerfile",
+        "context": "..",
+        "args": {
+            "IMAGE": "python:3.12"
+        }
+    },
+    "postCreateCommand": ". .devcontainer/setup.sh",
+    "customizations": {
+        "vscode": {
+            "settings": {
+                    "python.formatting.provider": "charliermarsh.ruff",
+                    "python.testing.pytestEnabled": true,
+                    "python.testing.pytestPath": "pytest",
+                    "python.testing.unittestEnabled": false,
+                    "python.editor.formatOnSave": true,
+                    "python.editor.codeActionsOnSave": {"source.fixAll": true},
+                    "python.testing.pytestArgs": [
+                        "tests"
+                    ],
+                    ".markdownlint-cli2.ignores": [".gitignore"]
+
+                },
+            "extensions": [
+				"ms-python.python",
+				"charliermarsh.ruff",
+				"GitHub.vscode-github-actions",
+				"yzhang.markdown-all-in-one",
+				"DavidAnson.vscode-markdownlint",
+                "ms-vscode.makefile-tools"
+			]
+        }
+    }
+}

.devcontainer/setup.sh

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+python -m pip install --user --upgrade pip
+python -m venv .venv
+source .venv/bin/activate
+python -m pip install pip-tools
+python -m piptools compile --upgrade -o requirements.txt requirements.in
+python -m pip install -r requirements-dev.txt

.github/workflows/devcontainer-ci.yml

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+name: Check Dev Container
+
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - ".devcontainer/**"
+      - ".github/workflows/devcontainer-ci.yaml"
+  pull_request:
+    branches: [ main ]
+    paths:
+      - ".devcontainer/**"
+      - ".github/workflows/devcontainer-ci.yaml"
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js 20.x
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20.x
+      - run: npm install -g @devcontainers/cli
+      - run: devcontainer build --config ./.devcontainer/devcontainer.json --workspace-folder "$(pwd)"

.github/workflows/tests.yml

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+name: PyTest
+on:
+  workflow_call:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+      fail-fast: true
+    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 dependencies
+        run: python -m pip install --upgrade pip -r requirements-dev.txt
+      - name: Run tests
+        run: python tests/test_template.py

requirements-dev.txt

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+pip-tools
+pytest
+
+-r requirements.txt

requirements.in

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+cookiecutter

requirements.txt

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+#
+# This file is autogenerated by pip-compile with Python 3.12
+# by the following command:
+#
+#    pip-compile --output-file=requirements.txt requirements.in
+#
+arrow==1.3.0
+    # via cookiecutter
+binaryornot==0.4.4
+    # via cookiecutter
+certifi==2024.8.30
+    # via requests
+chardet==5.2.0
+    # via binaryornot
+charset-normalizer==3.4.0
+    # via requests
+click==8.1.7
+    # via cookiecutter
+cookiecutter==2.6.0
+    # via -r requirements.in
+idna==3.10
+    # via requests
+jinja2==3.1.4
+    # via cookiecutter
+markdown-it-py==3.0.0
+    # via rich
+markupsafe==3.0.2
+    # via jinja2
+mdurl==0.1.2
+    # via markdown-it-py
+pygments==2.18.0
+    # via rich
+python-dateutil==2.9.0.post0
+    # via arrow
+python-slugify==8.0.4
+    # via cookiecutter
+pyyaml==6.0.2
+    # via cookiecutter
+requests==2.32.3
+    # via cookiecutter
+rich==13.9.4
+    # via cookiecutter
+six==1.17.0
+    # via python-dateutil
+text-unidecode==1.3
+    # via python-slugify
+types-python-dateutil==2.9.0.20241206
+    # via arrow
+urllib3==2.2.3
+    # via requests

tests/pytest.ini

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+[pytest]
+python_files = test_*.py
+python_classes = [A-Z]*Test
+python_functions = test_*

tests/test_template.py

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+"""
+Test the Cookiecutter template.
+"""
+from cookiecutter.generate import generate_context
+from cookiecutter.main import cookiecutter
+from pathlib import Path
+from shlex import split
+from subprocess import run
+from venv import create
+
+import pytest
+
+
+@pytest.fixture(scope="session")
+def template() -> Path:
+    """ The template under test.
+
+    """
+    return Path(__file__).resolve().parents[1]
+
+
+@pytest.fixture(scope="module")
+def tmpdir(tmp_path_factory) -> Path:
+    """ Test directory.
+
+    """
+    return tmp_path_factory.mktemp("test_template")
+
+
+@pytest.fixture(scope="module")
+def context(template) -> dict:
+    """ Template context for testing.
+
+    """
+    context = generate_context(template.joinpath("cookiecutter.json"))
+    context["cookiecutter"].update({
+        "project_slug": "slugify"
+    })
+    return context["cookiecutter"]
+
+
+@pytest.fixture(scope="module")
+def project(tmpdir, template, context) -> Path:
+    """ Create a test project from the Cookiecutter template.
+
+    """
+    cookiecutter(str(template), no_input=True, output_dir=tmpdir, extra_context=context)
+    return tmpdir / context["project_slug"]
+
+
+@pytest.fixture
+def python(tmp_path):
+    """ Create a Python virtual environment for testing.
+
+    """
+    venv = tmp_path / ".venv"
+    create(venv, with_pip=True)
+    return venv / "bin" / "python"
+
+
+def test_project(project):
+    """ Verify that the project was created correctly.
+
+    """
+    # Just a basic sanity test.
+    assert len(list(project.iterdir())) == 4
+    return
+
+
+@pytest.fixture
+def install_render_engine_cli(python):
+    install_cli = "pip install render_engine[cli]"
+    install_args = split(f"{python} -m {install_cli}")
+    install_process = run(install_args)
+    assert install_process.returncode == 0
+
+
+def test_site_generation(context, project, python, install_render_engine_cli):
+    generate_site = "render_engine build app:app"
+    generate_args = split(f"{python} -m {generate_site}")
+    generate_process = run(generate_args, cwd=project)
+    assert generate_process.returncode == 0
+
+
+# Make the script executable.
+
+if __name__ == "__main__":
+    raise SystemExit(pytest.main([__file__]))