feat: add backstop js test #34

	name: Backstop test
	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	permissions:
	contents: read

	jobs:
	backstop-tests:
	name: Visual regression tests
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v3
	with:
	persist-credentials: false

	- name: Set up Node
	uses: actions/setup-node@v4
	with:
	node-version: "20"

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.13"

	- name: Install dependencies
	run: \|
	npm install ci
	npx playwright install

	- name: Install xvfb
	run: sudo apt-get install -y xvfb pandoc

	- name: Build documentation
	run: \|
	pip install -e .[doc]
	xvfb-run make -C doc html

	- name: Serve documentation
	run: npx http-server -u -p 8000 ./doc/_build/html &

	- name: check if server is up
	run: curl -I http://localhost:8000 \|\| true

	- name: Run BackstopJS tests
	run: \|
	npm run test

	- name: Upload Backstop report (if failed)
	if: failure()
	uses: actions/upload-artifact@v4
	with:
	name: backstop-report
	path: backstop_data/html_report

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