def convert_roman_number(number)
  array = number.to_s.split('')

  ones_place = array[-1].to_i
  array[-1] = case ones_place
  when (1..8)
    repeat_numbers(ones_place, "I", "V")
  when (9)
    "IX"
  end

  if number >= 10
    tens_place = array[-2].to_i
    array[-2] = case tens_place
    when (1..8)
      repeat_numbers(tens_place, "X", "L")
    when (9)
      "XC"
    end
  end

  if number >= 100
    hundreds_place = array[-3].to_i
    array[-3] = case hundreds_place
    when (1..8)
      repeat_numbers(hundreds_place, "C", "D")
    when (9)
      "CM"
    end
  end

  if number >= 1000
    thousands_place = array[-4].to_i
    array[-4] = case thousands_place
    when (1..8)
      "M" * thousands_place
    end
  end

  array.join
end

def repeat_numbers(number, add, base = "")
  case number
  when (1..3)
    (add * number)
  when (4)
    add + base
  when (5)
    base
  when (6..8)
    base + (add * (number - 5))
  end
end



----------
describe "Number Conversion" do
  samples = {
    1 => "I",
    2 => "II",
    3 => "III",
    4 => "IV",
    5 => "V",
    10 => "X",
    14 => "XIV",
    30 => "XXX",
    42 => "XLII",
    60 => "LX",
    85 => "LXXXV",
    200 => "CC",
    402 => "CDII",
    211 => "CCXI",
    3200 => "MMMCC",
    }
  samples.each do |arabic_number, roman_numeral|
    it "converts #{arabic_number} to #{roman_numeral}" do
     Test.assert_equals(convert_roman_number(arabic_number), roman_numeral)
   end
  end
end