Hi Rennat,
that's strange: here is mine, https://github.com/scara/moodle-local_twittercard/blob/master/tests/behat/summary_card.feature#L1, and CI automation is fine w/ that e.g. https://travis-ci.org/scara/moodle-local_twittercard/jobs/314468706#L835.
HTH,
Matteo