How to run a single test from a rails test suite?

Question

How can I run a single test from a rails test suite?

rake test ANYTHING seems to not help.

Answer 1

If you want to run a single test, you can just run them as a regular Ruby script

ruby actionmailer/test/mail_layout_test.rb

You can also run a whole suite (eg. ActiveRecord or ActionMailer) by cd-ing into the directory and running rake test inside there.