Workaround para adicionar 'has_{no_}text?' em projeto com capybara 1.1

matchers_helper.rb

# all code from capybara master
module MatchersHelper
  # Capybara::Helpers
  def normalize_whitespace(text)
    text.to_s.gsub(/[\s\u0085\u00a0\u1680\u180e\u2000-\u200a\u2028\u2029\u202f\u205f\u3000]+/, ' ').strip
  end

  def to_regexp(text)
    text.is_a?(Regexp) ? text : Regexp.escape(normalize_whitespace(text))
  end

  # Capybara::Node::Matchers
  def has_text?(content)
    unless normalize_whitespace(text).match(to_regexp(content))
      raise ExpectationNotMet
    end
    return true
  rescue Capybara::ExpectationNotMet
    return false
  end

  def has_no_text?(content)
    synchronize do
      if normalize_whitespace(text).match(to_regexp(content))
        raise ExpectationNotMet
      end
    end
    return true
  rescue Capybara::ExpectationNotMet
    return false
  end
end

spec_helper.rb

#...
RSpec.configure do |config|
  config.before(:suite) do
    class Capybara::Session
      include MatchersHelper
    end
  end
end
#...