Try test CI

.gitlab-ci.yml

 image: php:5.6
+
+before_script:
+# We need to install dependencies only for Docker
+ - [[ ! -e /.dockerenv ]] && exit 0
+ - set -xe
+ - apt-get update -yqq
+ - curl --location --output /usr/local/bin/phpunit https://phar.phpunit.de/phpunit.phar
+ - chmod +x /usr/local/bin/phpunit
+
+test:app:
+  script:
+  - phpunit --configuration phpunit.xml.dist