new_without_new.rb

class Team
  attr_accessor :name, :country
  private_class_method :new
end

class Barcelona < Team
  def initialize(name, country)
    @name    = name
    @country  = country
  end

  def self.constructor(name, country)
    obj = allocate
    obj.send(:initialize, name, country)
    obj
  end
end

require 'test/unit'
class TestBarcelonaTeam < Test::Unit::TestCase
  def test_initialize_team
    team = Barcelona.constructor("Barcelona", "Spain")
    assert_equal "Barcelona", team.name
  end
end