language: php

sudo: false

cache:
  directories:
  - vendor

php:
  - 5.5.9
  - 5.5
  - 5.6
  - 7.0
  - 7.1
  - hhvm

install:
  - travis_retry composer install --no-interaction --prefer-source

script:
  - vendor/bin/phpunit

branches:
  only:
    - master