Rails 4.2.2 wrong computed class type

rails_422_bug_classtype.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails'
    gem 'arel'
    gem 'rack'
    gem 'i18n'
    gem 'pry-rails'
    gem 'sqlite3'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

require 'active_record'
require 'minitest/autorun'
require 'logger'

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :servers do |t|
  end

  create_table :local_drives do |t|
  end
end

class LocalDrive < ActiveRecord::Base
end

class Server < ActiveRecord::Base
  has_many :local_drives
end

class BugTest < Minitest::Test
  def test_habtm_reflections_with_nonstandard_name_and_class_name_option_work_correctly
    server = Server.create!
    server.local_drives << LocalDrive.create!
    # here you'll have the error
    # NameError: uninitialized constant Server::LocalDrife
  end
end