How to create an RSpec matcher that allows testing whether a page is indexable by search engines or not.

searchability.rb

#spec/features/home_spec.rb
require 'spec_helper'

describe 'Home page' do
  it 'should be searchable' do
    visit '/'
    page.should be_searchable
  end
end

#spec/support/searchability.rb
RSpec::Matchers::define :be_searchable do
  match do |page|
    !page.has_selector?('meta[name="robots"][content="noindex,nofollow"]', :visible => false)
  end
end