Add a test suite, coding standards and CI #1

	name: CI

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

	jobs:
	test:
	name: PHP ${{ matrix.php }}
	runs-on: ubuntu-latest

	strategy:
	fail-fast: false
	matrix:
	php: [ '8.3', '8.4', '8.5' ]

	steps:
	- uses: actions/checkout@v4

	- name: Set up PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php }}
	extensions: mbstring
	coverage: none
	tools: composer:v2

	- name: Install dependencies
	run: composer install --prefer-dist --no-progress --no-interaction

	- name: Lint
	run: find src tests -name '*.php' -print0 \| xargs -0 -n1 -P4 php -l > /dev/null

	- name: Coding standards
	run: composer lint

	- name: Formatting
	# Separate from the lint: a clean lint does not mean a clean format
	# check, and a green build has to mean both.
	run: composer format:check

	- name: Tests
	# set -o pipefail, because a pipeline reports its last command and tee
	# always succeeds -- without it a failing suite exits 0 and reads green.
	run: \|
	set -o pipefail
	composer test \| tee phpunit.log
	grep -qE 'OK \(\|Tests: ' phpunit.log \|\| {
	echo '::error::phpunit produced no result -- the suite did not run'
	exit 1
	}

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