url_test.rb

require 'abstract_unit'
require 'action_controller'

class WelcomeController < ActionController::Base
end

AppRoutes = ActionDispatch::Routing::RouteSet.new

class ActionMailer::Base
  include AppRoutes.url_helpers
end

class UrlTestMailer < ActionMailer::Base
  default_url_options[:host] = 'www.basecamphq.com'

  configure do |c|
    c.assets_dir = '' # To get the tests to pass
  end

  def signed_up_with_url(recipient)
    @recipient   = recipient
    @welcome_url = url_for host: "example.com", controller: "welcome", action: "greeting"
    mail(to: recipient, subject: "[Signed up] Welcome #{recipient}",
      from: "system@loudthinking.com", date: Time.local(2004, 12, 12))
  end
end

class ActionMailerUrlTest < ActionMailer::TestCase

  def encode( text, charset="UTF-8" )
    quoted_printable( text, charset )
  end

  def new_mail( charset="UTF-8" )
    mail = Mail.new
    mail.mime_version = "1.0"
    if charset
      mail.content_type ["text", "plain", { "charset" => charset }]
    end
    mail
  end

  def setup
    set_delivery_method :test
    ActionMailer::Base.perform_deliveries = true
    ActionMailer::Base.deliveries.clear
    ActiveSupport::Deprecation.silenced = false

    @recipient = 'test@localhost'
  end

  def teardown
    restore_delivery_method
  end

  def test_signed_up_with_url
    UrlTestMailer.delivery_method = :test

    AppRoutes.draw do
      get ':controller(/:action(/:id))'
      get '/welcome' => "foo#bar", as: "welcome"
    end

    expected = new_mail
    expected.to      = @recipient
    expected.subject = "[Signed up] Welcome #{@recipient}"
    expected.body    = "Hello there,\n\nMr. #{@recipient}. Please see our greeting at http://example.com/welcome/greeting http://www.basecamphq.com/welcome\n\n<img alt=\"Somelogo\" src=\"/images/somelogo.png\" />"
    expected.from    = "system@loudthinking.com"
    expected.date    = Time.local(2004, 12, 12)
    expected.content_type = "text/html"

    created = nil
    assert_nothing_raised { created = UrlTestMailer.signed_up_with_url(@recipient) }
    assert_not_nil created

    expected.message_id = '<123@456>'
    created.message_id = '<123@456>'
    assert_equal expected.encoded, created.encoded

    assert_nothing_raised { UrlTestMailer.signed_up_with_url(@recipient).deliver }
    assert_not_nil ActionMailer::Base.deliveries.first
    delivered = ActionMailer::Base.deliveries.first

    delivered.message_id = '<123@456>'
    assert_equal expected.encoded, delivered.encoded
  end
end