add tests for new visibility_level_helper methods
add tests for new visibility_level_helper methods

iiet/iiet-git,dreampet/gitlab,axilleas/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,iiet/iiet-git,stoplightio/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,stoplightio/gitlabhq,jirutka/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,mmkassem/gitlabhq,iiet/iiet-git,jirutka/gitlabhq,axilleas/gitlabhq