You can install gems with bundler from your Gemfile and skip a certain environment with

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bundle install --without test

To skip multiple environments do

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bundle install --without test --without development

This of course assumes you have a a gemfile something like:

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group :development, :test do 
  gem 'ruby-debug'
end

group :test do  
  gem "rspec", ">= 2.0.0.beta.19"
end

Also, Michael points out that you can skip the slow “Fetching source index for http://rubygems.org/” by using “—no-update-sources”

Have a nice day.