language: node_js
node_js:
  - '6'
  - '8'
sudo: false
cache:
  directories:
    - node_modules
before_install:
  - google-chrome-stable --headless --disable-gpu
before_script:
  - "export DISPLAY=:99.0"
  - "sh -e /etc/init.d/xvfb start"
  - sleep 3 # give xvfb some time to start
addons:
  chrome: stable