_kincom.rb

module KincomValidator

  def validate(file, options)
    is_file_valid?(file)
    is_options_valid?(options)
  end

  def is_file_valid?(file)
    validate_file_extension(file)
    #Kunne udbygges med flere checks. Readable, etc?
  end
end

validation_helper.rb

require_relative '_kincom'

module ValidationHelper

  def kincom
    include KincomValidator
  end
  module_function :kincom
end

xerciseclass.rb

require_relative './kincom/kincom'
require_relative './validations/validation_helper.rb'

class XerciseClass
  include ValidationHelper
  attr_reader :whoamI

  def initialize
    @whoamI = "I am an Xercise instance. I should not ever be called. Should I maybe be a module instead?"
  end

  def kincom(file, options)
    ValidationHelper::kincom
    KincomValidator::validate(file, options)
    Kincom.new(file, options)
  end

end