rubocop noise: fixes FrozenStringLiteralComment

Adding the .ruby-verison file triggered previously un-run cops, specifically:

  This cop is designed to help upgrade to Ruby 3.0. It will add the
  comment `# frozen_string_literal: true` to the top of files to enable
  frozen string literals. Frozen string literals will be default in Ruby
  3.0. The comment will be added below a shebang and encoding comment. The
  frozen string literal comment is only valid in Ruby 2.3+.

More info on rubocop [Automatic-Corrections](https://github.com/bbatsov/rubocop/wiki/Automatic-Corrections)

.ruby-version

@@ -1 +1 @@
-rvm --ruby-version use 2.3.1
+2.3.1

Gemfile

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 source 'https://rubygems.org'
 
 gem 'figaro', '~> 1.1.1'

Gemfile.lock

@@ -268,7 +268,7 @@ GEM
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.2)
-    unicode-display_width (1.1.0)
+    unicode-display_width (1.1.1)
     web-console (3.3.1)
       actionview (>= 5.0)
       activemodel (>= 5.0)

Guardfile

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # A sample Guardfile
 # More info at https://github.com/guard/guard#readme
 

Rakefile

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Add your own tasks in files placed in lib/tasks ending in .rake,
 # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
 

app/channels/application_cable/channel.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ApplicationCable
   class Channel < ActionCable::Channel::Base
   end

app/channels/application_cable/connection.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ApplicationCable
   class Connection < ActionCable::Connection::Base
   end

app/controllers/admin/auth_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Admin
   class AuthController < AdminController
     skip_before_action :authorize_admin

app/controllers/admin/profile_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Admin
   class ProfileController < AdminController
     def view

app/controllers/admin/question_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Admin
   class QuestionController < AdminController
     def index

app/controllers/admin/quiz_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Admin
   class QuizController < AdminController
     def index

app/controllers/admin/user_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module Admin
   class UserController < AdminController
     def index

app/controllers/admin_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class AdminController < ApplicationController
   layout 'admin'
   before_action :authorize_admin

app/controllers/application_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception
 

app/controllers/candidate_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class CandidateController < ApplicationController
   before_action :authorize_candidate, except: [:login, :validate, :live_coder]
   before_action :send_to_oops, only: [:login]

app/controllers/quiz_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class QuizController < ApplicationController
   before_action :authorize_candidate
 

app/controllers/recruiter_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class RecruiterController < ApplicationController
   before_action :authorize_recruiter, except: [:login, :auth]
 

app/controllers/review_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ReviewController < ApplicationController
   before_action :authorize_reviewer, except: [:login, :auth]
 

app/helpers/application_helper.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ApplicationHelper
   def experience_options val
     options_for_select([

app/jobs/application_job.rb

@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 class ApplicationJob < ActiveJob::Base
 end

app/mailers/application_mailer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ApplicationMailer < ActionMailer::Base
   default from: ENV['default_mail_from']
   layout 'mailer'

app/mailers/candidate_mailer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class CandidateMailer < ApplicationMailer
   def welcome candidate
     @candidate = candidate

app/mailers/recruiter_mailer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class RecruiterMailer < ApplicationMailer
   def candidate_created candidate
     @candidate = candidate

app/mailers/reviewer_mailer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ReviewerMailer < ApplicationMailer
   def candidate_submission candidate
     @candidate = candidate

app/mailers/user_mailer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class UserMailer < ApplicationMailer
   def password_reset user
     @user = user

app/models/answer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Answer < ApplicationRecord
   serialize :answer
 

app/models/application_record.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
 

app/models/candidate.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Candidate < ApplicationRecord
   belongs_to :quiz
   has_many :questions, -> { order("sort") }, through: :quiz

app/models/question.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Question < ApplicationRecord
   serialize :input_options
 

app/models/quiz.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Quiz < ApplicationRecord
   has_many :questions, -> { order(:sort) }
   has_many :candidates

app/models/user.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class User < ApplicationRecord
   has_secure_password
   has_many :candidates, foreign_key: "recruiter_id"

app/services/crypt_serializer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'openssl'
 require 'base64'
 

app/services/skill_config.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class SkillConfig < Settingslogic
   source "#{Rails.root}/config/application.yml"
   namespace Rails.env

app/validators/answer_format_validator.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class AnswerFormatValidator < ActiveModel::EachValidator
   def validate_each(record, attribute, value)
     send(record.question.input_type, record, attribute, value)

app/validators/email_format_validator.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class EmailFormatValidator < ActiveModel::EachValidator
   def validate_each(record, attribute, value)
     # EMAIL regex test

app/validators/input_options_presence_validator.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class InputOptionsPresenceValidator < ActiveModel::EachValidator
   def validate_each(record, attribute, value)
     return true unless record.input_type =~ /radio|check/i

app/workers/candidate_quiz.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class CandidateQuiz
   attr_reader :candidate_id
 

app/workers/candidate_quiz_question.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class CandidateQuizQuestion
   attr_reader :row
 

app/workers/quiz_status.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class QuizStatus
   attr_reader :candidate
 

app/workers/reminder.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Reminder
   def initialize
     @collection = reminder_collection

config.ru

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # This file is used by Rack-based servers to start the application.
 
 require_relative 'config/environment'

config/application.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative 'boot'
 
 require 'rails/all'

config/boot.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
 
 require 'bundler/setup' # Set up gems listed in the Gemfile.

config/environment.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Load the Rails application.
 require_relative 'application'
 

config/environments/development.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 

config/environments/production.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 

config/environments/test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 

config/initializers/application_controller_renderer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # ApplicationController.renderer.defaults.merge!(

config/initializers/assets.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Version of your assets, change this if you want to expire all your assets.

config/initializers/backtrace_silencers.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # You can add backtrace silencers for libraries that you're using but don't wish to see in your backtraces.

config/initializers/cookies_serializer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Specify a serializer for the signed and encrypted cookie jars.

config/initializers/custom_error_wrapper.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # TODO: needs better wrapping instead of nuking
 # https://rubyplus.com/articles/3401
 ActionView::Base.field_error_proc = proc do |html_tag, _instance|

config/initializers/filter_parameter_logging.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Configure sensitive parameters which will be filtered from the log file.

config/initializers/inflections.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Add new inflection rules using the following format. Inflections

config/initializers/mailjet.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Mailjet.configure do |config|
   config.api_key = ENV['mailjet_key']
   config.secret_key = ENV['mailjet_secret']

config/initializers/mime_types.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Add new mime types for use in respond_to blocks:

config/initializers/new_framework_defaults.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 #
 # This file contains migration options to ease your Rails 5.0 upgrade.

config/initializers/session_store.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 Rails.application.config.session_store :cookie_store, key: '_skill-assessment-app_session'

config/initializers/wrap_parameters.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # This file contains settings for ActionController::ParamsWrapper which

config/puma.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Puma can serve each request in a thread from an internal thread pool.
 # The `threads` method setting takes two numbers a minimum and maximum.
 # Any libraries that use thread pools should be configured to match

config/routes.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 Rails.application.routes.draw do
   post "/admin/login",              to: "admin/auth#auth",           as: :admin_auth
   get  "/admin/login",              to: "admin/auth#login",          as: :admin_login

config/spring.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 %w(
   .ruby-version
   .rbenv-vars

db/migrate/20160726193255_db_init.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class DbInit < ActiveRecord::Migration[5.0]
   def change
     create_table :candidates do |t|

db/migrate/20160727154057_add_quiz_to_candidate.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class AddQuizToCandidate < ActiveRecord::Migration[5.0]
   def change
     add_column :candidates, :quiz_id, :integer

db/migrate/20160803003932_add_attachments_to_questions.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class AddAttachmentsToQuestions < ActiveRecord::Migration[5.0]
   def change
     add_column :questions, :attachment, :string

db/migrate/20160818225721_add_name_to_quiz.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class AddNameToQuiz < ActiveRecord::Migration[5.0]
   def change
     add_column :quizzes, :name, :string, after: :id

db/migrate/20160824183159_add_resets_to_users.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class AddResetsToUsers < ActiveRecord::Migration[5.0]
   def change
     add_column :users, :reset_token, :string

db/migrate/20160826200610_encode_candidate_emails.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class EncodeCandidateEmails < ActiveRecord::Migration[5.0]
   def change
     sql = "select id, email from candidates;"

lib/tasks/reminders.rake

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 namespace :reminders do
   desc "send reminders to stagnate quizes"
   task send_all: :environment do

test/controllers/admin/auth_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 module Admin

test/controllers/admin/profile_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 module Admin

test/controllers/admin/question_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 module Admin

test/controllers/admin/quiz_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 module Admin

test/controllers/admin/user_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 module Admin

test/controllers/admin_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class AdminControllerTest < ActionDispatch::IntegrationTest

test/controllers/application_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class ApplicationControllerTest < ActionDispatch::IntegrationTest

test/controllers/candidate_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class CandidateControllerTest < ActionDispatch::IntegrationTest

test/controllers/quiz_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class QuizControllerTest < ActionDispatch::IntegrationTest

test/controllers/recruiter_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class RecruiterControllerTest < ActionDispatch::IntegrationTest

test/controllers/review_controller_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class ReviewControllerTest < ActionDispatch::IntegrationTest

test/integration/question_attachments_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class QuestionAttachmentsTest < ActionDispatch::IntegrationTest

test/integration/question_flow_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class QuestionFlowTest < ActionDispatch::IntegrationTest

test/integration/question_live_coder_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class QuestionLiveCoderTest < ActionDispatch::IntegrationTest

test/mailers/candidate_mailer_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class CandidateMailerTest < ActionMailer::TestCase

test/mailers/previews/candidate_mailer_preview.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Preview all emails at http://localhost:3000/rails/mailers/candidate_mailer
 class CandidateMailerPreview < ActionMailer::Preview
   def welcome

test/mailers/previews/recruiter_mailer_preview.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Preview all emails at http://localhost:3000/rails/mailers/recruiter_mailer
 class RecruiterMailerPreview < ActionMailer::Preview
   def candidate_created

test/mailers/previews/reviewer_mailer_preview.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Preview all emails at http://localhost:3000/rails/mailers/reviewer_mailer
 class ReviewerMailerPreview < ActionMailer::Preview
   def candidate_submission

test/mailers/previews/user_mailer_preview.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Preview all emails at http://localhost:3000/rails/mailers/user_mailer
 class UserMailerPreview < ActionMailer::Preview
   def password_reset

test/mailers/recruiter_mailer_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class RecruiterMailerTest < ActionMailer::TestCase

test/mailers/reviewer_mailer_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class ReviewerMailerTest < ActionMailer::TestCase

test/mailers/user_mailer_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class UserMailerTest < ActionMailer::TestCase

test/models/answer_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class AnswerTest < ActiveSupport::TestCase

test/models/candidate_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class CandidateTest < ActiveSupport::TestCase

test/models/question_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class QuestionTest < ActiveSupport::TestCase

test/models/quiz_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class QuizTest < ActiveSupport::TestCase

test/models/user_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class UserTest < ActiveSupport::TestCase

test/services/crypt_serializer_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class CryptSerializerTest < ActiveSupport::TestCase

test/services/skill_config_test.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'test_helper'
 
 class SkillConfigTest < ActiveSupport::TestCase

test/test_helper.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 ENV['RAILS_ENV'] ||= 'test'
 
 # https://github.com/colszowka/simplecov

test/test_helpers/answer_validatable.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class AnswerValidatable
   include ActiveModel::Validations