Add feature test for the spotcheck page letter
user
```ruby
require 'rails_helper'

RSpec.feature 'Spotcheck page displays letter to be sent', type: :feature do

  include Warden::Test::Helpers
  Warden.test_mode!

  let(:user) { create :user }

  before do
    login_as user
  end

  let(:application) { create :application_full_remission }
  let(:spotcheck) { create :spotcheck, application: application }

  scenario 'User navigates to the spot check page, which has all required details' do
    visit spotcheck_path(spotcheck)

    within '.spotcheck-letter' do
      expect(page).to have_content(application.full_name)
      expect(page).to have_content(user.name)
    end
  end
end
```
assistant