fix_bytea_change_detection.rb

gem 'activerecord', '4.2.0.beta4'
# gem 'activerecord', '4.1.8'
# gem 'activerecord', '4.0.12'
gem 'pg', '0.18.0.pre20141117110243'
# gem 'pg', '0.17.1'

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')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :binaries, force: true do |t|
    t.binary :data
  end
end

class Binary < ActiveRecord::Base
end

class BugTest < Minitest::Test
  # This succeeds on all rails and pg versions
  def test_text_only
    post = Binary.create! data: 'test'
    assert !post.changed?, "succeeds, because of text only"
    post.data = 'test'
    assert !post.changed?, "succeeds, because text only change"
  end

  def test_backslash
    post = Binary.create! data: '\\\\foo'
    assert !post.changed?, "signals change on rails-4.2.0.beta4, because of unescaping binary data"
    post.data = '\\\\foo'
    # This fails on rails versions >= 4.0
    assert !post.changed?, "nothing changed, but fails nevertheless"
  end

  def test_null_byte
    # This gives 'ArgumentError: string contains null byte' in unescape_bytea
    # with pg-0.18.0.pre20141117110243
    post = Binary.create! data: '\0'
    assert !post.changed?, "signals change on rails-4.2.0.beta4, because of unescaping binary data"
    post.data = '\0'
    # This fails on rails versions >= 4.0
    assert !post.changed?, "nothing changed, but fails nevertheless"
  end
end