Patch Tester is a Joomla extension that allows you to easily apply changes from pull requests.
Download the component at: https://github.com/mbabker/patchtester/releases/download/faker/com_patchtester.zip
You can see a video tutorial here: http://www.youtube.com/watch?v=4OWgusZgIfk&feature=youtube_gdata
Patch tester component was originally created by Ian Maclennan, and has been improved by Nikolai Plath and Michael Babker.
You can find most updated source code at: https://github.com/mbabker/patchtester