Use capture_emails helper to improve email assertions in specs (#29245)

spec/controllers/admin/resets_controller_spec.rb

@@ -5,6 +5,8 @@ require 'rails_helper'
 describe Admin::ResetsController do
   render_views
 
+  subject { post :create, params: { account_id: account.id } }
+
   let(:account) { Fabricate(:account) }
 
   before do
@@ -13,11 +15,11 @@ describe Admin::ResetsController do
 
   describe 'POST #create', :sidekiq_inline do
     it 'redirects to admin accounts page' do
-      expect do
-        post :create, params: { account_id: account.id }
-      end.to change(Devise.mailer.deliveries, :size).by(2)
+      emails = capture_emails { subject }
 
-      expect(Devise.mailer.deliveries).to have_attributes(
+      expect(emails.size)
+        .to eq(2)
+      expect(emails).to have_attributes(
         first: have_attributes(
           to: include(account.user.email),
           subject: I18n.t('devise.mailer.password_change.subject')