gistfile1.rb

require 'delegate'
require 'test/unit'

# http://www.saturnflyer.com/blog/jim/2013/03/21/ruby-delegate-rb-secrets/

class Displayer < SimpleDelegator
  # alias_method from post originally out of order:
  #   alias_method :__getobj__, :object
  alias_method :object, :__getobj__

  def name_with_location
    "#{object.name} of #{object.city}"
  end
end

class TestDisplayer < Test::Unit::TestCase
  def test_name_with_location
    jim = Struct.new(:name, :city).new("Jim", "Some City")
    displayer = Displayer.new(jim)
    assert_equal "Jim of Some City", displayer.name_with_location
  end
end