Let's assume, that got back into dark ages when developers haven't FactoryGirl gem and had to use fixtures instead.
You are first one, who understood that fixtures are not so handy as other think they are. You decide to write you own library and open source it for the world. FactoryBoy is looking like a good name.
You started from the simple class that you want to test and looks as simple as it is:
class User
attr_accessor :name, :email