如何对默认时间戳(created_at、updated_at)进行rails rspec测试

# app/models/user.rb
class User < ApplicationRecord
end

# spec/models/user_spec.rb
require 'rails_helper'

RSpec.describe User, type: :model do
  describe "timestamps" do
    it "creates a user with the correct timestamps" do
      user = User.create(name: "John Doe")
      
      expect(user.created_at).to be_present
      expect(user.updated_at).to eq(user.created_at)
    end

    it "updates the user and changes the updated_at timestamp" do
      user = User.create(name: "Jane Doe")
      original_updated_at = user.updated_at
      
      user.update(name: "Jane Smith")
      
      expect(user.updated_at).to_not eq(original_updated_at)
      expect(user.created_at).to eq(original_updated_at)
    end
  end
end

# Gemfile
gem 'timecop'

# spec/models/user_spec.rb
require 'rails_helper'
require 'timecop'

RSpec.describe User, type: :model do
  describe "timestamps" do
    it "creates a user with the correct timestamps" do
      Timecop.freeze(Time.now) do
        user = User.create(name: "John Doe")
        expect(user.created_at).to eq(Time.now)
        expect(user.updated_at).to eq(Time.now)
      end
    end
  end
end