Convert admin/change_emails spec controller->system (#34215)

spec/system/admin/change_emails_spec.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Admin Change Emails' do
+  let(:admin) { Fabricate(:admin_user) }
+
+  before { sign_in admin }
+
+  describe 'Changing the email address for a user', :inline_jobs do
+    let(:user) { Fabricate :user }
+
+    it 'updates user details and sends email' do
+      visit admin_account_change_email_path(user.account.id)
+      expect(page)
+        .to have_title(I18n.t('admin.accounts.change_email.title', username: user.account.username))
+
+      fill_in 'user_unconfirmed_email', with: 'test@host.example'
+      emails = capture_emails { process_change_email }
+      expect(emails.first)
+        .to be_present
+        .and(deliver_to('test@host.example'))
+        .and(have_subject(/Confirm email/))
+      expect(page)
+        .to have_title(user.account.pretty_acct)
+    end
+
+    def process_change_email
+      expect { click_on I18n.t('admin.accounts.change_email.submit') }
+        .to not_change { user.reload.email }
+        .and(change { user.reload.unconfirmed_email }.to('test@host.example'))
+        .and(change { user.reload.confirmation_token }.from(nil).to(be_present))
+    end
+  end
+end