_kincom.rb

module KincomLoader

  def load_file(file)
    loaded_file = RubyXL::Parser.parse(file).worksheets
    data = extract_values(loaded_file)
    return File.basename(file), data
  end

  def extract_values(sheets)
    array = []
    sheets.each do |sheet|
      array << sheet.map { |row| row[1].value.to_f }
    end
    array
  end

    module_function :load_file
end

loading_helper.rb

require_relative '_kincom'

module LoadingHelper
  def self.included(other) other.include KincomLoader; end
end

test.rb

  def test_kincom_loading
    # Test-filen loades
    rubyxl = KincomLoader::load_file(FILE)
    # Vi skulle meget gerne få et array tilbage
    assert_instance_of Array, rubyxl[1]
     #... som består af
    rubyxl[1].each do |r|
      assert_instance_of Array, r
      end
  end

xerciseclass.rb

$debug.msg

require_relative './kincom/kincom'
require_relative './validation/validation_helper.rb'
require_relative './loading/loading_helper.rb'

class XerciseClass
  include ValidationHelper
  include LoadingHelper
  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)
    validate(file, options)
    data = KincomLoader::load_file(file)
    Kincom.new(data[1], options.merge!({ filename: data[0] }))
  end

end