human_attributes_bug_test.rb

begin
  require "bundler/inline"
rescue LoadError => e
  $stderr.puts "Bundler version 1.10 or later is required. Please update your Bundler"
  raise e
end

gemfile(true) do
  source "https://rubygems.org"
  if ENV['RAILS_NEXT']
    gem "rails", "6.0.0.rc2"
  else
    gem "rails", "5.2.3"
  end
  gem "sqlite3"
end

require "active_record"
require "minitest/autorun"
require "logger"

ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :users do |t|
    t.string :first_name
    t.string :last_name
  end
end

class User < ActiveRecord::Base
  validates :first_name, presence: { message: 'must be there!' }

  def self.human_attributes
    @human_attributes
  end

  def self.human_attribute_name(attr, options = {})
    @human_attributes ||= []
    @human_attributes << attr.inspect
    super
  end
end

class BugTest < Minitest::Test
  def test_frozen_attributes
    user = User.new(first_name: '', last_name: 'Ketchum')
    user.save
    user.errors.full_messages

    # Two symbols that were `inspect`ed
    # In RAILS_NEXT this is [":first_name", "\"first_name\""]
    assert_equal [":first_name", ":first_name"], User.human_attributes
  end
end