diff --git a/test_app/spec/models/customer_spec.rb b/test_app/spec/models/customer_spec.rb
index ca41843..35c42ee 100644
--- a/test_app/spec/models/customer_spec.rb
+++ b/test_app/spec/models/customer_spec.rb
@@ -45,5 +45,13 @@
     expect(customer.vip).to eq(true)
   end
 
+  it 'travel_to' do
+    travel_to Time.zone.local(2004, 11, 23, 01, 04, 44) do
+      @customer = create(:customer_vip)
+    end
+
+    expect(@customer.created_at).to be < Time.now
+  end
+
   it { expect{ create(:customer) }.to change{Customer.all.size}.by(1) }
 end
diff --git a/test_app/spec/rails_helper.rb b/test_app/spec/rails_helper.rb
index bd84774..9e6d41e 100644
--- a/test_app/spec/rails_helper.rb
+++ b/test_app/spec/rails_helper.rb
@@ -28,6 +28,9 @@
 
 RSpec.configure do |config|
 
+  # Time Helper
+  config.include ActiveSupport::Testing::TimeHelpers
+
   # FactoryBot
   config.include FactoryBot::Syntax::Methods