My Photoshop Classroom

Whether you offer free or premium themes, testing should be a major part of your development process. By planning in advance, you can foster a development environment that deters some bugs by design and that helps you prevent others. The aim of this article is to share some of the tricks I use personally during and after development to achieve a bug-free product.
This article is split into three distinct sections:
Setting up,
Development phase,
Final testing.
This should give you a good overview of what you can do over the course of the development cycle. I invite everyone to chime in with their own tips in the comments. I’d be interested to hear your tips on testing WordPress themes!


Source: http://wp.smashingmagazine.com/2013/05/29/tips-tricks-testing-wordpress-themes/