javascript runtime gem required for cucumber tests with rails

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Problem

According to the ‘Cucumber book’ the gems required to start using cucumber with a rails application are the following:

group
 :test do
gem
 'cucumber-rails', '1.2.1'
gem
 'rspec-rails', '2.7.0'
gem
 'database_cleaner', '0.7.0'
end

On the most recent rails version (currently 3.2.9) the gems need to be updated and also include the javascript runtime gem ‘therubyracer’

Solution

The following gems are working with Rails 3.2.9

group :test do
  gem 'cucumber-rails', '~> 1.3.0'
  gem 'rspec-rails', '~> 2.12.0'
  gem 'database_cleaner', '~> 0.9.1'
  # Add javascript runtime environment
  gem "therubyracer", "~> 0.10.2"
end

You can then run the 

$ rails g cucumber:install

command to generate the files and folders necessary for cucumber.