Improve newsletter model spec list_of_recipients

spec/models/newsletter_spec.rb

@@ -48,15 +48,19 @@ describe Newsletter do
   end
 
   describe '#list_of_recipients' do
+    let(:erased_user) { create(:user, username: 'erased_user') }
+
     before do
       create(:user, newsletter: true, username: 'newsletter_user')
       create(:user, newsletter: false)
+      erased_user.erase
       newsletter.update(segment_recipient: 'all_users')
     end
 
     it 'returns list of recipients excluding users with disabled newsletter' do
       expect(newsletter.list_of_recipients.count).to eq(1)
       expect(newsletter.list_of_recipients.first.username).to eq('newsletter_user')
+      expect(newsletter.list_of_recipients).not_to include(erased_user)
     end
   end
 end