Testing ActionMailer multipart emails(text and html version) with RSpec

Question

I\'m currently testing my mailers with RSpec, but I\'ve started setting up multipart emails as described in the Rails Guides here: http://guides.rubyonrails.org/action_mailer_b

Answer 1

To make things even simpler, you can use

message.text_part    and
message.html_part

to find the respective parts. This works even for structured multipart/alternative messages with attachments. (Tested on Ruby 1.9.3 with Rails 3.0.14.)

These methods employ some kind of heuristic to find the respective message parts, so if your message has multiple text parts (e.g. as Apple Mail creates them) it might fail to do the "right thing".

This would change the above method to

def body_should_match_regex(mail, regex)
 if mail.multipart?
  ["text", "html"].each do |part|
   mail.send("#{part}_part").body.raw_source.should match(regex)
  end
 else
  mail.body.raw_source.should match(regex)
 end
end

which works for both plaintext (non-multipart) messages and multipart messages and tests all message bodies against a specific regular expression.

Now, any volunteers to make a "real" RSpec matcher out of this? :) Something like

@mail.bodies_should_match /foobar/

would be a lot nicer ...