How Corey Haines structed his tests for the Roman Numerals kata according to http://youtu.be/vX-Yym7166Y

roman_numerals_test.rb

describe "Converting arabic numbers to roman numerals" do
  {
    1 => "I",
    2 => "II",
    5 => "V"
    #...
  }.each_pair do |arabic, roman|
    it "converts #{arabic} to #{roman}" do
      expect(convert(arabic)).to eq(roman)
    end
  end
end