Test metadata docs suggest specifying github as the gem source:
gem 'minitest-ci', :git => 'firstname.lastname@example.org:circleci/minitest-ci.git'
I’d rather reduce gem sources where possible, mainly because it slows down dev and deploy. Also, it’s safer. Can we just rely on Circle to push updates to Rubygems and use Rubygems as the source? I notice the README on github doesn’t use the custom git location, so I guess it’s not needed.
[BTW you could simplify the syntax to
gem 'minitest-ci', github: 'circleci/minitest-ci']