tests

Apply code improvements by Rector #13

	name: tests

	on:
	push:
	pull_request:

	jobs:
	linux_tests:
	runs-on: ubuntu-20.04

	strategy:
	matrix:
	php: ['8.1', '8.2']
	stability: ['prefer-lowest', 'prefer-stable']

	name: PHP ${{ matrix.php }} - ${{ matrix.stability }}

	steps:
	- name: Checkout code
	uses: actions/checkout@v2

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

	- name: Check for syntax errors in PHP files
	run: find ./ -type f -name '*.php' -print0 \| xargs -0 -L1 -P4 -- php -l

	- name: Check composer files
	run: composer validate --strict

	- name: Install dependencies
	run: composer update --${{ matrix.stability }} --prefer-dist --no-interaction --no-progress

	- name: Execute tests
	run: vendor/bin/phpunit --verbose

	- name: Check coding standard
	run: vendor/bin/php-cs-fixer --no-interaction --dry-run --diff -v fix lib/

Provide feedback