gistfile1.txt

class RomanNumeral

  def self.add_roman(roman_number)
    result = 0

    roman_number.each_char do |c|
      
      result += roman_lookup(c)

    end
    result

  end

  def self.to_arabic(roman_number)
    add_roman roman_number
  end

  def self.roman_lookup(character)
     case character
      when "I" 
        1
      when "V"
        5
    end
  end

end


describe RomanNumeral do
  it 'returns 1' do
    RomanNumeral.to_arabic( 'I' ).should == 1
  end

  it 'returns 5' do
    RomanNumeral.to_arabic( 'V' ).should == 5
  end

  describe 'adds' do
    it 'many numbers' do
      RomanNumeral.to_arabic( 'VII' ).should == 7
    end
  end

  it 'subtracts' do
    RomanNumeral.to_arabic( 'IV' ).should == 4
  end
end

Thanks!