don't use xvfb

1 job for gitlab-ci-test in 9 minutes and 48 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #2897
test

00:09:48

 
Name Stage Failure
failed
test Test
  pep8: commands succeeded
congratulations :)
14 06 2018 14:01:19.144:INFO [karma]: Karma v2.0.2 server started at http://0.0.0.0:9876/
14 06 2018 14:01:19.148:INFO [launcher]: Launching browser Firefox with unlimited concurrency
14 06 2018 14:01:19.155:INFO [launcher]: Starting browser Firefox
14 06 2018 14:02:19.207:WARN [launcher]: Firefox have not captured in 60000 ms, killing.
14 06 2018 14:02:21.212:WARN [launcher]: Firefox was not killed in 2000 ms, sending SIGKILL.
14 06 2018 14:02:23.215:WARN [launcher]: Firefox was not killed by SIGKILL in 2000 ms, continuing.
ERROR: Job failed: exit code 1