suite_condition("Rails 3 not compatible with 1.8.6") do
  RUBY_VERSION != '1.8.6'
end

gemfile <<-RB
  gem 'rails', '~>3.2.0'
  gem 'haml'
RB
gemfile <<-RB
  gem 'rails', '~>3.1.0'
  gem 'haml'
RB
gemfile <<-RB
  gem 'rails', '~>3.0.0'
  gem 'haml'
RB