Test your mailers in Rails 3

I don’t blog very often but I felt this was worth posting, since it left me scratching my head for a few minutes… Trying to test new mailers in Rails 3 (v 3.0.3 to be exact) with no real documentation – everything out there failed miserably since most examples show use of TMail. So here it is, my MailerTest:

require 'test_helper'

class MailerTest < ActionMailer::TestCase

  CHARSET = 'UTF-8'

  context "Forgetting a password" do
    setup do
      @user = User.create(valid_user_params)
      @expected = Mail.new
      @expected.content_type = 'text/plain'
      @expected.charset = CHARSET
      @expected.mime_version = '1.0'
    end

    should "send password reset instructions" do
      @expected.from    = "from@example.com"
      @expected.to      = @user.email
      @expected.subject = "Some Fancy Subject"

      assert_equal @expected, Mailer.password_reset_instructions(@user)
    end
  end
end

I’m using Shoulda with TestUnit, but in theory this should work with rspec, etc. Thanks to http://kpumuk.info/ruby-on-rails/testing-mailers-with-rspec/ for giving me a starting point… There’s definitely more you can add, like testing for the body content, but really this was all I needed for the purposes of this test.

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