PHPUnit uses .env.testing by default, so that file needs to contain the APP_KEY

.gitlab-ci.yml

@@ -15,9 +15,11 @@ php-build-job:
     - composer install
     - cp .env.testing .env
     - php artisan key:generate
+    - cp .env .env.testing
   artifacts:
     paths:
       - .env
+      - .env.testing
       - vendor/
   cache:
     paths:
@@ -43,7 +45,7 @@ php-test-job:
     - export DB_DATABASE="$MYSQL_DATABASE"
     - export DB_USERNAME=root
     - export DB_PASSWORD="$MYSQL_ROOT_PASSWORD"
-    - ./vendor/bin/phpunit --coverage-cobertura code-coverage.xml
+    - php artisan test
   artifacts:
     reports:
       cobertura: code-coverage.xml