Add test to verify that created_at is not synced

spec/dummy_app/app/models/gizmo.rb

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+class Gizmo < ApplicationRecord
+  has_paper_trail synchronize_version_creation_timestamp: false
+end

spec/dummy_app/db/migrate/20110208155312_set_up_test_tables.rb

@@ -6,7 +6,7 @@
 # Starting with AR 5.1, we must specify which version of AR we are using.
 # I tried using `const_get` but I got a `NameError`, then I learned about
 # `::ActiveRecord::Migration::Current`.
-class SetUpTestTables < ::ActiveRecord::Migration::Current
+class SetUpTestTables < ActiveRecord::Migration::Current
   MYSQL_ADAPTERS = [
     "ActiveRecord::ConnectionAdapters::MysqlAdapter",
     "ActiveRecord::ConnectionAdapters::Mysql2Adapter"
@@ -48,6 +48,11 @@ def up
       t.timestamps null: true, limit: 6
     end
 
+    create_table :gizmos, force: true do |t|
+      t.string :name
+      t.timestamps null: true, limit: 6
+    end
+
     create_table :widgets, force: true do |t|
       t.string    :name
       t.text      :a_text

spec/models/gizmo_spec.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+require "support/performance_helpers"
+
+RSpec.describe Gizmo, type: :model, versioning: true do
+  context "with a persisted record" do
+    it "does not use the gizmo `updated_at` as the version's `created_at`" do
+      gizmo = described_class.create(name: "Fred", created_at: Time.current - 1.day)
+      gizmo.name = "Allen"
+      gizmo.save(touch: false)
+      expect(gizmo.versions.last.created_at).not_to(eq(gizmo.updated_at))
+    end
+  end
+end