class RSpec::Rails::Matchers::SendEmail

def sent_emails_message
  if @diff.empty?
    "\n\nThere were no any emails sent inside the expectation block."
  else
    sent_emails =
      @diff.map do |email|
        inspected = INSPECT_EMAIL_ATTRIBUTES.map { |attr| "#{attr}: #{email.public_send(attr)}" }.join(", ")
        "- #{inspected}"
      end.join("\n")
    "\n\nThe following emails were sent:\n#{sent_emails}"
  end
end