Spec to test that your Gemfile locks all of its gems

gemfile_spec.rb

# In your Gemfile:
#
# group :test do
#   gem 'gemnasium-parser', '0.1.9'
# end
#

require 'spec_helper'

describe 'Gemfile' do
  it 'should lock all gems' do
    gemfile = Gemnasium::Parser.gemfile(File.read(File.join(Rails.root, 'Gemfile')))
    non_specific_gems = gemfile.dependencies.reject{|dep| dep.requirement.requirements.first.first == '='}
    msg = "#{non_specific_gems.map(&:name).join(', ')} #{non_specific_gems.size > 1 ? 'are' : 'is'} not locked"
    non_specific_gems.should be_empty, msg
  end
end

Well if you don't need 1.8 support, this latest revision won't allow ~> either