In this live-code exercise we will build a method to convert positive integer numbers into Roman numerals (we can't do zero because the Romans didn't have the concept of zero, that came from the Babylonians, Indians and Mayans).

Like we did with FizzBuzz, set up a project named Roman_Number with:

• A Git hub Repo
• A Rakefile, you can copy from the FizzBuzz project
• A .ruby-version & .ruby-gemset file
• A lib & specs directory

Roman_Number objects can be instantiated with a single integer parameter that must be positive and will throw an IllegalArgument Exception if they are given an argument less than 1 or a non-FixNum.

It will have a method called get_roman method which will return the Roman_Number as a String in Roman Numeral format.

For the Base-solution we will only concern ourselves with numbers less than 31.

In the specs folder we will create a Roman_Number_spec.rb file and write out specifications. You will need at least 5 test-cases.

Test cases should look like this:

require 'minitest'
require 'minitest/spec'
require 'minitest/autorun'
require 'minitest/reporters'


require_relative '../lib/Roman_Number'

describe Roman_Number do

  it "Testing for Roman_Number Creation" do
    expect( Roman_Number.new(1)).must_be_instance_of Roman_Number
  end

  it "Testing for numbers 1-3" do
    expect( Roman_Number.new(1).get_roman()).must_equal "I"
    expect( Roman_Number.new(2).get_roman()).must_equal "II"
    expect( Roman_Number.new(3).get_roman()).must_equal "III"
   end    
end

When the test cases run and fail because we haven't written code yet start step 2.

Next in the lib folder create a Roman_Number class. Keep working on it until it passes the tests.

Now we have a solution, but it might not be ideal. What can we improve the solution? Improve the solution and then re-run the tests.