travis run dusk

.travis.yml

@@ -31,6 +31,7 @@ install:
   - cd ./laravel-tests
   - php artisan admin:composer-config
   - travis_retry composer require dcat/laravel-admin:*@dev
+  - travis_retry composer require laravel/dusk --dev
   - php artisan admin:publish --force
   - php artisan admin:install