fix topic spec

spec/controllers/topics_controller_spec.rb

@@ -3,12 +3,11 @@ require 'rails_helper'
 
 RSpec.describe TopicsController, type: :controller do
   let(:user) { create(:user) }
-  let(:topic) { create(:topic, user: user) }
+  let(:topic) { create(:topic, user: user, updated_by: user) }
   let(:valid_attributes) { topic.attributes.except('id') }
   let(:invalid_attributes) { { permission: :invalid_lol } }
   before :each do
-    sign_in :user
-    
+    sign_in(user)
   end
 
   describe 'POST #create' do