factory_girl

https://github.com/thoughtbot/factory_girl

Ruby

A library for setting up Ruby objects as test data.

Mail::Message#part

Allows you to add a part in block form to an existing mail message object

Example:

 mail = Mail.new do
   part :content_type => "multipart/alternative", :content_disposition => "inline" do |p|
     p.part :content_type => "text/plain", :body => "test text\nline #2"
     p.part :content_type => "text/html", :body => "<b>test</b> HTML<br/>\nline #2"
   end
 end

Source | Google | Stack overflow

Edit

git clone [email protected]:thoughtbot/factory_girl.git
cd factory_girl
open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Mail--Message-part-for-pr

# Commit to git

git add git commit -m "better docs for Mail::Message#part"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Mail--Message-part-for-pr

hub pull-request

# Celebrate!