Postgresql Reconnect Error

postgresql_reconnect.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'
  # Activate the gem you are reporting the issue against.
  gem 'activerecord', '4.2.2'
  gem 'pg'
end

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

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

# This connection will do for database-independent bug reports.
ActiveRecord::Base.establish_connection(adapter: 'postgresql', database: 'test_db', username: 'test', password: 'test', host: 'localhost')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :posts, force: true do |t|
  end

  create_table :comments, force: true do |t|
    t.integer :post_id
  end
end

class Post < ActiveRecord::Base
  has_many :comments
end

class Comment < ActiveRecord::Base
  belongs_to :post
end

class BugTest < Minitest::Test
  def pid
    @pid ||= ActiveRecord::Base.connection.execute("SELECT pid FROM pg_stat_activity WHERE datname='test_db';").first['pid']
  end

  def test_postgresql_reconnect_block
    adapter = ActiveRecord::Base.connection
    adapter.send :prepare_statement, 'SELECT 1'

    `echo 'password' | sudo -S kill -9 #{pid}`
    conn = adapter.instance_variable_get :@connection
    assert_equal conn.status, 0

    pool = adapter.instance_variable_get :@statements
    assert pool.send :connection_active?
    assert_raises PG::UnableToSend do
      adapter.reconnect!
    end
  end
end