Best success version spec files with build_stubbed instead of create

replace_create_to_build_stubbed.rb

require_relative 'spec/spec_helper.rb'
require 'pry-byebug'

class SpecFile
  CREATE = ' create(:'.freeze
  BUILD_STUBBED = ' build_stubbed(:'.freeze

  attr_reader :file_name, :content_array

  def initialize(file_name)
    @file_name = file_name

    content = File.open(file_name, 'r:UTF-8').read
    @content_array = content.split(CREATE)
    @cached_statuses = {}
  end

  def write_best
    return if content_array.size == 1
    puts("Started #{file_name}")

    positions = Array.new(content_array.size - 1) { false }

    positions.size.times do

      before = positions.count(&:itself)
      switch(positions)
      break if before == positions.count(&:itself)
    end

    puts("Completed with result #{positions.inspect}")
    write_position(positions)
  end

  private

  def switch(positions)
    positions.each.with_index do |position, i|
      next if position

      positions[i] = true
      write_position(positions)
      line = 1 + content_array[0..i].sum { |x| x.scan("\n").size }

      status = get_from_cache(positions, line) || run(positions, line)
      positions[i] = false if status != 0
    end
  end

  def write_position(positions)
    result = content_array[0].dup
    positions.each.with_index do |val, index|
      result << (val ? BUILD_STUBBED : CREATE)
      result << content_array[index+1]
    end

    File.open(file_name, 'w+') { |f| f.write(result) }

    positions.count(&:itself)
  end

  def get_from_cache(positions, line)
    name = positions.join + "#{line}"
    @cached_statuses[name]
  end

  def puts_to_cache(positions, line, result)
    name = positions.join + "#{line}"
    @cached_statuses[name] = result
  end

  def run(positions, line)
    pattern = "#{file_name}:#{line}"
    pid = fork {
      code = RSpec::Core::Runner.run([pattern])
      raise 'With errors' if code != 0
    }
    _, status = Process.waitpid2(pid)

    result = status.exitstatus
    puts "#{pattern} #{positions.inspect} => #{result}"
    puts_to_cache(positions, line, result)
    result
  end
end

Dir["spec/**/*_spec.rb"].each do |file|
  SpecFile.new(file).write_best
end

Sample output:

Started spec/decorators/table/menu_item_decorator_spec.rb
bundle exec rspec spec/decorators/table/menu_item_decorator_spec.rb:10 [true, false, false, false] => 0
bundle exec rspec spec/decorators/table/menu_item_decorator_spec.rb:10:15 [true, true, false, false] => 0
bundle exec rspec spec/decorators/table/menu_item_decorator_spec.rb:10:15:20 [true, true, true, false] => 0
bundle exec rspec spec/decorators/table/menu_item_decorator_spec.rb:10:15:20:40 [true, true, true, true] => 0
Completed with result [true, true, true, true]