fixed tests to use build command

Author: DavertMik

.travis.yml

@@ -14,5 +14,6 @@ before_script:
   - printf "\n" | pecl install ${IMAGICK}
   - phantomjs --webdriver=4444 --ignore-ssl-errors=true >/dev/null 2>&1 &
   - composer install
+  - php vendor/bin/codecept build
 
 script: php vendor/bin/codecept run -c test/integration/