Add test configuration files and update PHPUnit setup; remove depreca… #5

	name: PHP Composer

	on:
	push:
	branches: [ "dev" ]
	pull_request:
	branches: [ "dev" ]

	permissions:
	contents: read

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4

	- name: Validate composer.json and composer.lock
	run: composer validate --strict

	- name: Set up PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: 8.2
	extensions: mbstring, intl
	tools: composer

	- name: Cache Composer packages
	id: composer-cache
	uses: actions/cache@v3
	with:
	path: vendor
	key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
	restore-keys: \|
	${{ runner.os }}-php-

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

	# Add a test script to composer.json, for instance: "test": "vendor/bin/phpunit"
	# Docs: https://getcomposer.org/doc/articles/scripts.md

	- name: Run test suite
	run: composer run-script test

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