roman_number_spec.rb

require 'roman_number'

describe Fixnum, "Roman Number" do

  context "when try to convert a number" do
    
    io_expections = {
      0 => '',
      1 => 'I',
      2 => 'II',
      3 => 'III',
      4 => 'IV',
      5 => 'V',
      6 => 'VI',
      7 => 'VII',
      8 => 'VIII',
      9 => 'IX',
      10 => 'X',
      20 => 'XX',
      30 => 'XXX',
      40 => 'XL',
      50 => 'L',
      60 => 'LX',
      70 => 'LXX',
      80 => 'LXXX',
      90 => 'XC',
      100 => 'C',
      200 => 'CC',
      300 => 'CCC',
      400 => 'CD',
      500 => 'D',
      600 => 'DC',
      700 => 'DCC',
      800 => 'DCCC',
      900 => 'CM',
      1000 => 'M',
      2000 => 'MM',
      3000 => 'MMM',
      4000 => 'MMMM',
      2013 => 'MMXIII',
      4999 => 'MMMMCMXCIX',
      5000 => '',
    }
    
    io_expections.each do |input,output|
      it "returns #{output} if number is #{input}" do
        input.to_roman.should == output
      end
    end
    
  end

end