Last night Eric Maino (http://www.meeteric.net) gave a talk at GANG (http://www.migang.org) about Test Driven Development (TDD). It was a very good talk that touched on a lot of the important issues involved in testing. It was a good overview of NUnit (http://www.nunit.org) and how TDD works. The slides will be up on the GANG web site soon.
One of the questions that came up was how GUI testing works with NUnit. I happened to attend a talk at