Build

adding null behaviour in mutation build #20

	name: Build

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build:

	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2

	- 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: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
	restore-keys: ${{ runner.os }}-php-

	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: '8.3'

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

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

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