Laravel 5.1 /phpunit - Sending headers with get/post calls

I am looking for a solution to embed jwt token as header in the get/post requests I sent to the server in my phpunit tests. Is there any option to add header to the GET/POST calls? I am currently using following method to send a GET request to the server.

content = $this->get('users/logout')->response->getContent();

via Chebli Mohamed