Use Dusk on Travis

Author: mpociot

.travis.yml

@@ -17,6 +17,9 @@ before_script:
   - npm install pixelmatch
   - travis_retry composer self-update
   - travis_retry composer update ${COMPOSER_FLAGS} --no-interaction --prefer-source
+  - export DISPLAY=:99.0
+  - sh -e /etc/init.d/xvfb start
+  - ./vendor/laravel/dusk/bin/chromedriver-linux &
 
 script:
   - vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover