Selenium Simpletest javascript drupal7

This article explains how to use Selenium to test Javascript with Simpletest on Drupal 7. 
Eventhough Simpletest allows you to run all your tests in a sandbox, it's almost impossible to use any Javascript. 
Selenium deals with the Javascript and runs the tests in a new installation, not being your current site.

www.koumbit.org/en/articles/selenium-testing-javascript-simpletest-drupal-7