module TestM
  def do_something(text)
    define_method('hi') do
      puts 'hi' + text
    end
  end
end

class BaseTest
  extend TestM
end

class Tester < BaseTest

  do_something('sam')
end

class Tes < BaseTest
  do_something 'dsfd'
end

test = Tester.new

coll = Tes.new

test.hi
coll.hi