TestAPI
CoreMVVM
XamlPadX
Xaml Compliance
Needless to say I use VSTS for testing purposes. However, quite a lot of people use NUnit for testing. So it was a good read for me when I came across Sacha's post on NUnit and WPF testing. So if you are using NUnit, do take a peek :)
Other related posts:
http://marlongrech.wordpress.com/2007/10/14/wpf-unit-testing/
http://www.codeproject.com/KB/WPF/UnitTestDispatcherTimer.aspx
PingBack from http://mgalinks.wordpress.com/2008/11/26/2008-november-26-links-for-today/
I have been writing lotsa' unit tests (and integration tests in a unit test harness) using MbUnit and MbUnit runner plugin for resharper.
MBUnit has a nice 'run in sta' attribute that makes things a lot simpler.