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diff --git a/vendor/rails/activerecord/test/cases/lifecycle_test.rb b/vendor/rails/activerecord/test/cases/lifecycle_test.rb
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+++ b/vendor/rails/activerecord/test/cases/lifecycle_test.rb
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+require "cases/helper"
+require 'models/topic'
+require 'models/developer'
+require 'models/reply'
+require 'models/minimalistic'
+
+class Topic; def after_find() end end
+class Developer; def after_find() end end
+class SpecialDeveloper < Developer; end
+
+class TopicManualObserver
+  include Singleton
+
+  attr_reader :action, :object, :callbacks
+
+  def initialize
+    Topic.add_observer(self)
+    @callbacks = []
+  end
+
+  def update(callback_method, object)
+    @callbacks << { "callback_method" => callback_method, "object" => object }
+  end
+
+  def has_been_notified?
+    !@callbacks.empty?
+  end
+end
+
+class TopicaAuditor < ActiveRecord::Observer
+  observe :topic
+
+  attr_reader :topic
+
+  def after_find(topic)
+    @topic = topic
+  end
+end
+
+class TopicObserver < ActiveRecord::Observer
+  attr_reader :topic
+
+  def after_find(topic)
+    @topic = topic
+  end
+end
+
+class MinimalisticObserver < ActiveRecord::Observer
+  attr_reader :minimalistic
+
+  def after_find(minimalistic)
+    @minimalistic = minimalistic
+  end
+end
+
+class MultiObserver < ActiveRecord::Observer
+  attr_reader :record
+
+  def self.observed_class() [ Topic, Developer ] end
+
+  cattr_reader :last_inherited
+  @@last_inherited = nil
+
+  def observed_class_inherited_with_testing(subclass)
+    observed_class_inherited_without_testing(subclass)
+    @@last_inherited = subclass
+  end
+
+  alias_method_chain :observed_class_inherited, :testing
+
+  def after_find(record)
+    @record = record
+  end
+end
+
+class LifecycleTest < ActiveRecord::TestCase
+  fixtures :topics, :developers, :minimalistics
+
+  def test_before_destroy
+    original_count = Topic.count
+    (topic_to_be_destroyed = Topic.find(1)).destroy
+    assert_equal original_count - (1 + topic_to_be_destroyed.replies.size), Topic.count
+  end
+
+  def test_after_save
+    ActiveRecord::Base.observers = :topic_manual_observer
+    ActiveRecord::Base.instantiate_observers
+
+    topic = Topic.find(1)
+    topic.title = "hello"
+    topic.save
+
+    assert TopicManualObserver.instance.has_been_notified?
+    assert_equal :after_save, TopicManualObserver.instance.callbacks.last["callback_method"]
+  end
+
+  def test_observer_update_on_save
+    ActiveRecord::Base.observers = TopicManualObserver
+    ActiveRecord::Base.instantiate_observers
+
+    topic = Topic.find(1)
+    assert TopicManualObserver.instance.has_been_notified?
+    assert_equal :after_find, TopicManualObserver.instance.callbacks.first["callback_method"]
+  end
+
+  def test_auto_observer
+    topic_observer = TopicaAuditor.instance
+    assert_nil TopicaAuditor.observed_class
+    assert_equal [Topic], TopicaAuditor.instance.observed_classes.to_a
+
+    topic = Topic.find(1)
+    assert_equal topic.title, topic_observer.topic.title
+  end
+
+  def test_inferred_auto_observer
+    topic_observer = TopicObserver.instance
+    assert_equal Topic, TopicObserver.observed_class
+
+    topic = Topic.find(1)
+    assert_equal topic.title, topic_observer.topic.title
+  end
+
+  def test_observing_two_classes
+    multi_observer = MultiObserver.instance
+
+    topic = Topic.find(1)
+    assert_equal topic.title, multi_observer.record.title
+
+    developer = Developer.find(1)
+    assert_equal developer.name, multi_observer.record.name
+  end
+
+  def test_observing_subclasses
+    multi_observer = MultiObserver.instance
+
+    developer = SpecialDeveloper.find(1)
+    assert_equal developer.name, multi_observer.record.name
+
+    klass = Class.new(Developer)
+    assert_equal klass, multi_observer.last_inherited
+
+    developer = klass.find(1)
+    assert_equal developer.name, multi_observer.record.name
+  end
+
+  def test_after_find_can_be_observed_when_its_not_defined_on_the_model
+    observer = MinimalisticObserver.instance
+    assert_equal Minimalistic, MinimalisticObserver.observed_class
+
+    minimalistic = Minimalistic.find(1)
+    assert_equal minimalistic, observer.minimalistic
+  end
+
+  def test_after_find_can_be_observed_when_its_defined_on_the_model
+    observer = TopicObserver.instance
+    assert_equal Topic, TopicObserver.observed_class
+
+    topic = Topic.find(1)
+    assert_equal topic, observer.topic
+  end
+
+  def test_after_find_is_not_created_if_its_not_used
+    # use a fresh class so an observer can't have defined an
+    # after_find on it
+    model_class = Class.new(ActiveRecord::Base)
+    observer_class = Class.new(ActiveRecord::Observer)
+    observer_class.observe(model_class)
+
+    observer = observer_class.instance
+
+    assert !model_class.method_defined?(:after_find)
+  end
+
+  def test_after_find_is_not_clobbered_if_it_already_exists
+    # use a fresh observer class so we can instantiate it (Observer is
+    # a Singleton)
+    model_class = Class.new(ActiveRecord::Base) do
+      def after_find; end
+    end
+    original_method = model_class.instance_method(:after_find)
+    observer_class = Class.new(ActiveRecord::Observer) do
+      def after_find; end
+    end
+    observer_class.observe(model_class)
+
+    observer = observer_class.instance
+    assert_equal original_method, model_class.instance_method(:after_find)
+  end
+
+  def test_invalid_observer
+    assert_raise(ArgumentError) { Topic.observers = Object.new; Topic.instantiate_observers }
+  end
+end