Add coverage and use mailer callback to check functional user in notification mailer (#32055)

spec/mailers/notification_mailer_spec.rb

@@ -3,6 +3,17 @@
 require 'rails_helper'
 
 RSpec.describe NotificationMailer do
+  shared_examples 'delivery to non functional user' do
+    context 'when user is not functional' do
+      before { receiver.update(confirmed_at: nil) }
+
+      it 'does not deliver mail' do
+        emails = capture_emails { mail.deliver_now }
+        expect(emails).to be_empty
+      end
+    end
+  end
+
   let(:receiver)       { Fabricate(:user, account_attributes: { username: 'alice' }) }
   let(:sender)         { Fabricate(:account, username: 'bob') }
   let(:foreign_status) { Fabricate(:status, account: sender, text: 'The body of the foreign status') }
@@ -24,6 +35,8 @@ RSpec.describe NotificationMailer do
         .and have_thread_headers
         .and have_standard_headers('mention').for(receiver)
     end
+
+    include_examples 'delivery to non functional user'
   end
 
   describe 'follow' do
@@ -40,6 +53,8 @@ RSpec.describe NotificationMailer do
         .and(have_body_text('bob is now following you'))
         .and have_standard_headers('follow').for(receiver)
     end
+
+    include_examples 'delivery to non functional user'
   end
 
   describe 'favourite' do
@@ -58,6 +73,8 @@ RSpec.describe NotificationMailer do
         .and have_thread_headers
         .and have_standard_headers('favourite').for(receiver)
     end
+
+    include_examples 'delivery to non functional user'
   end
 
   describe 'reblog' do
@@ -76,6 +93,8 @@ RSpec.describe NotificationMailer do
         .and have_thread_headers
         .and have_standard_headers('reblog').for(receiver)
     end
+
+    include_examples 'delivery to non functional user'
   end
 
   describe 'follow_request' do
@@ -92,6 +111,8 @@ RSpec.describe NotificationMailer do
         .and(have_body_text('bob has requested to follow you'))
         .and have_standard_headers('follow_request').for(receiver)
     end
+
+    include_examples 'delivery to non functional user'
   end
 
   private