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

If your email has attachments the text and html parts will end be placed in a multipart/alternative part. This is noted on under Sending Emails with Attachments in the Rails 3 Guide.

To handle this, I first simplified the get_message_part method above to:

def get_message_part(mail, content_type)
  mail.body.parts.find { |p| p.content_type.match content_type }
end

Then in my test:

multipart = get_message_part(email, /multipart/)

html = get_message_part(multipart, /html/)
html_body = html.body.raw_source

assert_match 'some string', html_body