Add unit tests and refactor for testability #2

	name: CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Setup Node.js
	uses: actions/setup-node@v4
	with:
	node-version: '20'
	cache: 'npm'

	- name: Install dependencies
	run: npm ci

	- name: Run tests
	run: npm test

	- name: Build
	run: npm run build

	- name: Check for uncommitted changes
	run: \|
	if [ -n "$(git status --porcelain dist/)" ]; then
	echo "Error: dist/ has uncommitted changes"
	git diff dist/
	exit 1
	fi

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