how test emails?

david wrote:

hi, i'm writing all following TDD, but what about a mail system, how can
i test it? how can i test that a mail has been sent? have i to use a

ActionMailer has a mock system built in. Read your test.rb and
test_helper.rb files, then either use it or learn from it.

Agile Web Development with Rails, 2nd Ed. has an excellent chapter on
testing email.

You can get just the .pdf if you want to.