Roman Numeral Kata Result

numeral.rb

class Numeral
  CONVERSIONS = {
    100 => 'C',
    90 => 'X',
    10 => 'X',
    5 => 'V',
    4 => 'IV',
    1 => 'I',
  }

  def self.to_roman(n)
    result = ''

    CONVERSIONS.each do |value, numeral|
      while n >= value
        result += numeral
        n -= value
      end
    end

    result
  end

end

numeral_spec.rb

require_relative '../lib/numeral'
require_relative './spec_helper'

describe Numeral do

  it 'converts 1 to I' do
    assert_equal 'I', Numeral.to_roman(1)
  end

  it 'converts 2 to II' do
    assert_equal 'II', Numeral.to_roman(2)
  end

  it 'converts 5 to V' do
    assert_equal 'V', Numeral.to_roman(5)
  end

  it 'converts 10 to X' do
    assert_equal 'X', Numeral.to_roman(10)
  end

  it 'converts 20 to XX' do
    assert_equal 'XX', Numeral.to_roman(20)
  end

  it 'converts 25 to XXV' do
    assert_equal 'XXV', Numeral.to_roman(25)
  end

  it 'converts 4 to IV' do
    assert_equal 'IV', Numeral.to_roman(4)
  end

  it 'converts 100 to C' do
    assert_equal 'C', Numeral.to_roman(100)
  end

end

spec_helper.rb

require 'minitest/autorun'