Add pending test for the great-grandparent touching bug from #19324

activerecord/test/cases/touch_later_test.rb

@@ -2,8 +2,11 @@ require 'cases/helper'
 require 'models/invoice'
 require 'models/line_item'
 require 'models/topic'
+require 'models/node'
+require 'models/tree'
 
 class TouchLaterTest < ActiveRecord::TestCase
+  fixtures :nodes, :trees
 
   def test_touch_laster_raise_if_non_persisted
     invoice = Invoice.new
@@ -90,4 +93,22 @@ class TouchLaterTest < ActiveRecord::TestCase
       invoice.touch_later
     end
   end
+
+  def test_touching_three_deep
+    skip "Pending from #19324"
+
+    previous_tree_updated_at        = trees(:root).updated_at
+    previous_grandparent_updated_at = nodes(:grandparent).updated_at
+    previous_parent_updated_at      = nodes(:parent_a).updated_at
+    previous_child_updated_at       = nodes(:child_one_of_a).updated_at
+
+    travel 5.seconds
+
+    Node.create! parent: nodes(:child_one_of_a), tree: trees(:root)
+
+    assert_not_equal nodes(:child_one_of_a).reload.updated_at, previous_child_updated_at
+    assert_not_equal nodes(:parent_a).reload.updated_at, previous_parent_updated_at
+    assert_not_equal nodes(:grandparent).reload.updated_at, previous_grandparent_updated_at
+    assert_not_equal trees(:root).reload.updated_at, previous_tree_updated_at
+  end
 end

activerecord/test/fixtures/nodes.yml

@@ -0,0 +1,29 @@
+grandparent:
+  id: 1
+  tree_id: 1
+  name: Grand Parent
+
+parent_a:
+  id: 2
+  tree_id: 1
+  parent_id: 1
+  name: Parent A
+
+parent_b:
+  id: 3
+  tree_id: 1
+  parent_id: 1
+  name: Parent B
+
+child_one_of_a:
+  id: 4
+  tree_id: 1
+  parent_id: 2
+  name: Child one
+
+child_two_of_b:
+  id: 5
+  tree_id: 1
+  parent_id: 2
+  name: Child two
+

activerecord/test/fixtures/trees.yml

@@ -0,0 +1,3 @@
+root:
+  id: 1
+  name: The Root

activerecord/test/models/node.rb

@@ -0,0 +1,5 @@
+class Node < ActiveRecord::Base
+  belongs_to :tree, touch: true
+  belongs_to :parent,   class_name: 'Node', touch: true, optional: true
+  has_many   :children, class_name: 'Node', foreign_key: :parent_id, dependent: :destroy
+end

activerecord/test/models/tree.rb

@@ -0,0 +1,3 @@
+class Tree < ActiveRecord::Base
+  has_many :nodes, dependent: :destroy
+end

activerecord/test/schema/schema.rb

@@ -867,6 +867,17 @@ ActiveRecord::Schema.define do
     t.string 'from'
   end
 
+  create_table :nodes, force: true do |t|
+    t.integer :tree_id
+    t.integer :parent_id
+    t.string :name
+    t.datetime :updated_at
+  end
+  create_table :trees, force: true do |t|
+    t.string :name
+    t.datetime :updated_at
+  end
+
   create_table :hotels, force: true do |t|
   end
   create_table :departments, force: true do |t|