Read original post at Brian Harry's Blog
After we shipped VS 2010, we shipped a “Testing Feature Pack” that included support for testing Silverlight 4 applications using UI automation. Our full intent was to incorporate that support into VS 2012. Unfortunately, there were so many competing priorities, we just didn’t have time to get it in – and what’s more we released Silverlight 5, further widening the gap in our support.
As VS 2012 has been winding down, the team has had some “spare” time and has done some work to take the original Silverlight support, extend it to also support Silverlight 5 and package it up as a download. [...]