For running tests i have to edit Gemfile

Created by: jacargentina

Each time i want to run spinach tests, i should edit Gemfile cause i get this error with upstream Gemfile.

/home/javiercastro/.gem/ruby/1.9.1/gems/backports-2.6.7/lib/backports/tools.rb:314:in `require': cannot load such file -- minitest/unit (LoadError)

Then i edit Gemfile adding at bottom this

gem 'minitest'

Then tests run just fine.

My question is, any advice on which is the problem in my setup? As far as i understand, the gem is installed correctly, but it is not loaded by default?