Demonstrates a bug in the identity_cache gem: https://github.com/Shopify/identity_cache/issues/246

memoized_attributes_test.rb

require "test_helper"

class MemoizedAttributesTest < IdentityCache::TestCase
  def test_memoization_should_not_break_dirty_tracking
    item = Item.create!

    IdentityCache.cache.with_memoization do
      Item.fetch(item.id)
      Item.fetch(item.id).title = "my title"
      Item.fetch(item.id).update(title: "my title")

      assert_equal "my title", Item.find(item.id).title
    end
  end
end