factory_girl

https://github.com/thoughtbot/factory_girl

Ruby

A library for setting up Ruby objects as test data.

Mail::Message#<=>

Provides the operator needed for sort et al.

Compares this mail object with another mail object, this is done by date, so an
email that is older than another will appear first.

Example:

 mail1 = Mail.new do
   date(Time.now)
 end
 mail2 = Mail.new do
   date(Time.now - 86400) # 1 day older
 end
 [mail2, mail1].sort #=> [mail2, mail1]

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-----for-pr

# Commit to git

git add git commit -m "better docs for Mail::Message#<=>"

# 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-----for-pr

hub pull-request

# Celebrate!