language: node_js
node_js:
  - "7"
  - "6"
before_script:
  - export DISPLAY=:99.0
  - sh -e /etc/init.d/xvfb start
addons:
  firefox: "latest"

language: node_js
node_js:
  - "8"
  - "7"
  - "6"
before_script:
  - export DISPLAY=:99.0
  - sh -e /etc/init.d/xvfb start
addons:
  firefox: "latest"
cache: yarn

Add Node 8 and cache yarn
:construction_worker: Add Node 8 and cache yarn

- Add Node 8 in build.
- Cache Yarn.
