Bump actions/checkout from 3 to 4 #21

	name: PHP Mutation testing

	on:
	push:
	branches: [ main ]

	jobs:
	test:
	runs-on: 'ubuntu-latest'
	steps:
	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: '8.1'

	- uses: actions/checkout@v4
	with:
	fetch-depth: 0

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

	- name: Cache Composer packages
	id: composer-cache
	uses: actions/cache@v3
	with:
	path: vendor
	key: ${{ runner.os }}-php-8.1-${{ hashFiles('**/composer.lock') }}
	restore-keys: \|
	${{ runner.os }}-php-8.1

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

	- name: Run test suite
	run: ./vendor/bin/infection --threads=2

	- name: Archive mutation results
	uses: actions/upload-artifact@v3
	with:
	name: Mutation log
	path: infection.log

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