Use `let` in Profiles::NotificationsController spec

spec/controllers/profiles/notifications_controller_spec.rb

 require 'spec_helper'
 describe Profiles::NotificationsController do
+  let(:user) do
+    create(:user) do |user|
+      user.emails.create(email: 'original@example.com')
+      user.emails.create(email: 'new@example.com')
+      user.update(notification_email: 'original@example.com')
+      user.save!
+    end
+  end
+
   describe 'GET show' do
     it 'renders' do
-      user = create_user
       sign_in(user)
       get :show
@@ -14,7 +22,6 @@ describe Profiles::NotificationsController do
   describe 'POST update' do
     it 'updates only permitted attributes' do
-      user = create_user
       sign_in(user)
       put :update, user: { notification_email: 'new@example.com', notified_of_own_activity: true, admin: true }
@@ -27,7 +34,6 @@ describe Profiles::NotificationsController do
     end
     it 'shows an error message if the params are invalid' do
-      user = create_user
       sign_in(user)
       put :update, user: { notification_email: '' }
@@ -36,13 +42,4 @@ describe Profiles::NotificationsController do
       expect(controller).to set_flash[:alert].to('Failed to save new settings')
     end
   end
-
-  def create_user
-    create(:user) do |user|
-      user.emails.create(email: 'original@example.com')
-      user.emails.create(email: 'new@example.com')
-      user.update(notification_email: 'original@example.com')
-      user.save!
-    end
-  end
 end