Lets see fit his works.

.env.testing

@@ -0,0 +1,11 @@
+APP_ENV=testing
+APP_DEBUG=true
+APP_KEY=SomeRandomString
+
+DB_HOST=localhost
+DB_DATABASE=homestead
+DB_USERNAME=homestead
+DB_PASSWORD=secret
+
+CACHE_DRIVER=file
+SESSION_DRIVER=file

.travis.yml

@@ -11,6 +11,7 @@ addons:
 install:
   - rm composer.lock
   - composer install
+  - php artisan env
 
 script:
   - ./tests/_data/db.sh