ActionMailer test helpers

aris · November 14, 2012, 2:36pm

Hi,

I recently found these two helpers (assert_emails, assert_no_emails)
inside
ActionMailer gem:

rails/rails/blob/main/actionmailer/lib/action_mailer/test_helper.rb

# frozen_string_literal: true

require "active_support/core_ext/array/extract_options"
require "active_job"

module ActionMailer
  # Provides helper methods for testing Action Mailer, including #assert_emails
  # and #assert_no_emails.
  module TestHelper
    include ActiveJob::TestHelper

    # Asserts that the number of emails sent matches the given number.
    #
    #   def test_emails
    #     assert_emails 0
    #     ContactMailer.welcome.deliver_now
    #     assert_emails 1
    #     ContactMailer.welcome.deliver_now
    #     assert_emails 2
    #   end

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I wonder why they are not mentioned in the official documentation:

Are they deprecated ? Should I use them or better to stick with
assert_difference 'ActionMailer::Base.deliveries.size', +1 do ?

Regards,
Anton