Extend from `ApplicationController`

This commit is in response to the previous error:

Error:
UserSharesAMessageTest#test_visiting_the_index:
DRb::DRbRemoteError: undefined method `make_response!' for NotesController:Class (NoMethodError)

By extending the project’s [ApplicationController][application_controller], the NotesController gains access to ActionController::Base.make_response!.

When the tests are run again, a new error is raised:

Error:
UserSharesAMessageTest#test_visiting_the_index:
AbstractController::ActionNotFound: The action 'index' could not be found for NotesController


      app/controllers/notes_controller.rb

diff --git a/app/controllers/notes_controller.rb b/app/controllers/notes_controller.rb
index bb3ba93..c94d2e3 100644
--- a/app/controllers/notes_controller.rb
+++ b/app/controllers/notes_controller.rb
@@ -1,2 +1,2 @@
-class NotesController
+class NotesController < ApplicationController
 end

Extend from ApplicationController

Extend from `ApplicationController`