factory_girl

https://github.com/thoughtbot/factory_girl

Ruby

A library for setting up Ruby objects as test data.

Mail::Message#resent_sender

Returns the Resent-Sender value of the mail object, as a single string of an address
spec.  A sender per RFC 2822 must be a single address, so you can not append to
this address.

Example:

 mail.resent_sender = 'Mikel <[email protected]>'
 mail.resent_sender #=> '[email protected]'

Also allows you to set the value by passing a value as a parameter

Example:

 mail.resent_sender 'Mikel <[email protected]>'
 mail.resent_sender #=> '[email protected]'

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-resent_sender-for-pr

# Commit to git

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

# 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-resent_sender-for-pr

hub pull-request

# Celebrate!