Awesome

spring-commands-testunit

This gem implements a testunit command for Spring, which supports running a file/directory of Test::Unit-style tests:

spring testunit test/controllers/posts_controller_test.rb
spring testunit test/controllers

It's no longer necessary if you're on Rails 4, since in Rails 4 you can pass the file/directory to the rake test command:

spring rake test test/controllers/posts_controller_test.rb
spring rake test test/controllers

Usage

Add to your Gemfile:

gem "spring-commands-testunit"