Create a copy of the old `Primer::Classify::Utilities` and rename it `Primer::Classify::UtilitiesOld` before running

utilities_bench.rb

# frozen_string_literal: true

require "benchmark"
require_relative "lib/primer/classify/utilities"
require_relative "lib/primer/classify/utilities_old"

# make sure YML is loaded
Primer::Classify::Utilities::UTILITIES
Primer::Classify::UtilitiesOld::UTILITIES


runs = [10_000, 50_000, 100_000]

runs.each do |n|
  puts "Running #{n} times."
  Benchmark.bm do |benchmark|
    benchmark.report("Old") do
      n.times do
        Primer::Classify::UtilitiesOld.classes_to_hash("mr-1 d-md-block hide-sm anim-fade-in foo")
      end
    end

    benchmark.report("New") do
      n.times do
        Primer::Classify::Utilities.classes_to_hash("mr-1 d-md-block hide-sm anim-fade-in foo")
      end
    end
  end
end