Object under test

rule.rb

class Rule

  def self.setters(*method_names)
    method_names.each do |name|
      send :define_method, name do |data|
        instance_variable_set "@#{name}".to_sym, data.
      end
    end
  end
  
  setters :trigger
  
  def initialize &block
    @trigger = "blank trigger special_sauce"
    instance_eval &block
    "in a #{@trigger}"
  end
  
end