gitlab-ci: Try to execute youtube-dl without command

4 jobs for master in 2 minutes and 18 seconds (queued for 1 second)
Name Stage Failure
failed
unit_tests Test
gitlab.ethz.ch/chgerber/youtubedl.TestGetYouTubeDownloadLink(0xc0002be200)
/builds/chgerber/youtubedl/youtubedl_test.go:37 +0xa0
testing.tRunner(0xc0002be200, 0xad6320)
/usr/local/go/src/testing/testing.go:865 +0xc0
created by testing.(*T).Run
/usr/local/go/src/testing/testing.go:916 +0x35a
FAIL gitlab.ethz.ch/chgerber/youtubedl 0.281s
make: *** [Makefile:12: test] Error 1
ERROR: Job failed: exit code 2