added failing touch propagation test

Signed-off-by: José Valim <jose.valim@gmail.com>

activerecord/test/cases/timestamp_test.rb

@@ -82,4 +82,21 @@ class TimestampTest < ActiveRecord::TestCase
   ensure
     Pet.belongs_to :owner, :touch => true
   end
+
+  def test_touching_a_record_touches_parent_record_and_grandparent_record
+    Toy.belongs_to :pet, :touch => true
+    Pet.belongs_to :owner, :touch => true
+
+    toy = Toy.first
+    pet = toy.pet
+    owner = pet.owner
+
+    previously_owner_updated_at = owner.updated_at
+
+    toy.touch
+
+    assert_not_equal previously_owner_updated_at, owner.updated_at
+  ensure
+    Toy.belongs_to :pet
+  end
 end

activerecord/test/schema/schema.rb

@@ -398,6 +398,7 @@ ActiveRecord::Schema.define do
   create_table :pets, :primary_key => :pet_id ,:force => true do |t|
     t.string :name
     t.integer :owner_id, :integer
+    t.timestamps
   end
 
   create_table :pirates, :force => true do |t|
@@ -530,6 +531,7 @@ ActiveRecord::Schema.define do
   create_table :toys, :primary_key => :toy_id ,:force => true do |t|
     t.string :name
     t.integer :pet_id, :integer
+    t.timestamps
   end
 
   create_table :traffic_lights, :force => true do |t|