At the end of unit tests you [can see](https://travis-ci.org/rmariuzzo/Laravel-JS-Localization/jobs/181049343): ```shell OK (9 tests, 37 assertions) > if [[ `php -v` =~ "PHP 5.6" ]]; then ./vendor/bin/phpunit --configuration tests/5.3; fi sh: 1: [[: not found ``` I suppose that it's `bash` syntax while CI using common `sh`.