language: php

php:
  - 8.0
  - 7.4
  - 7.3
  - 7.2

env:
  matrix:
    - COMPOSER_FLAGS="--prefer-lowest"
    - COMPOSER_FLAGS=""

before_install:
  - travis_retry composer self-update

install:
  - travis_retry composer update --prefer-source $PREFER_LOWEST

script:
  - phpunit