ruby - rails command failing -

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i following this tutorial covers tdd using rspec, capybara etc. added following gemfile:

group :test, :development     gem 'turn'     gem 'rspec-rails'     gem 'capybara'     gem 'guard-rspec'     gem 'growl_notify' end

ran bundle install , get:

juco@jucoimac ~/desktop/rails-test $ rails s     gem install minitest     /library/ruby/gems/1.8/gems/turn-0.9.6/lib/turn/minitest.rb:9:in `require': no such file load -- minitest/unit (loaderror)         /library/ruby/gems/1.8/gems/turn-0.9.6/lib/turn/minitest.rb:9         /library/ruby/gems/1.8/gems/turn-0.9.6/lib/turn.rb:13:in `require'         /library/ruby/gems/1.8/gems/turn-0.9.6/lib/turn.rb:13         /library/ruby/gems/1.8/gems/bundler-1.2.4/lib/bundler/runtime.rb:68:in `require'         /library/ruby/gems/1.8/gems/bundler-1.2.4/lib/bundler/runtime.rb:68:in `require'         /library/ruby/gems/1.8/gems/bundler-1.2.4/lib/bundler/runtime.rb:66:in `each'         /library/ruby/gems/1.8/gems/bundler-1.2.4/lib/bundler/runtime.rb:66:in `require'         /library/ruby/gems/1.8/gems/bundler-1.2.4/lib/bundler/runtime.rb:55:in `each'         /library/ruby/gems/1.8/gems/bundler-1.2.4/lib/bundler/runtime.rb:55:in `require'         /library/ruby/gems/1.8/gems/bundler-1.2.4/lib/bundler.rb:128:in `require'         /users/juco/desktop/rails-test/config/application.rb:7         /library/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/commands.rb:53:in `require'         /library/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/commands.rb:53         /library/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/commands.rb:50:in `tap'         /library/ruby/gems/1.8/gems/railties-3.2.12/lib/rails/commands.rb:50         script/rails:6:in `require'         script/rails:6

when try execute rails commands including rails server. has been posted before, went unanswered.

turn gem version-

 group :test       gem 'turn', '< 0.8.3'     end

followed from: minitest error.


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