As title, I try to run Ruby Rspec automation test with chromedriver on the gitlab-ci. But I failed. I've tried many solutions which I googled and got from here, nothing can work for me. Please help me, thanks.

My setting works fine in my local environment and also works fine with the headless mode on gitlab-ci. So I think it's very weird it can't work with chromedriver on the gitlab-ci.
Please check my post on stackoverflow for more details, thanks.
http://stackoverflow.com/questions/42802217/rspec-test-with-chromedriver-cant-run-on-gitlab-gitlab-ci