create_spec_files.rb

require 'active_support/all'

def main
  rb_file_paths_raw = `find app -type f -name '*.rb'`

  rb_file_paths = rb_file_paths_raw.split("\n")

  rb_file_paths.each do |file_name|
    spec_file_name = file_name.sub(/^app/, 'spec').sub(/.rb$/, '_spec.rb')

    next if File.exists?(spec_file_name)

    class_name = get_class_name(file_name)
    describe =  <<~SPEC
    require 'rails_helper'

    RSpec.describe #{class_name} do
      # 自動生成されたテストファイルです
    end
    SPEC

    puts spec_file_name
    #puts describe
    # dir 作成
    `mkdir -p #{spec_file_name.sub(/\/*.rb/, '')}`
    # ファイル作成
    File.open(spec_file_name, 'w') { |f| f.print(describe) }
  end
end

def get_class_name(file_name)
  file_name
    .sub(/^app\//, '')
    .sub(/^(.+?)\//, '')
    .sub(/.rb$/, '')
    .split('/')
    .map{ |v| v.camelize }
    .join('::')
end

main