Monkey_patching.rb

module Cucumber
  module Formatter
    class Html
      def initialize(step_mother, path_or_io, options)
      end
      def after_features
        puts "original after_features"
      end
    end
  end
end

orig = Cucumber::Formatter::Html.new('a','b','c')
orig.after_features

module Cucumber
  module Formatter
    class Html
      def after_features
        puts "new after_features"
      end
    end
  end
end

new = Cucumber::Formatter::Html.new('a','b','c')
new.after_features