What are some cutting edge C# testing technologies?

Me and two other students are investigating how to write unit tests in C#. We are preparing a presentation about this that we can give to other students. We want to investigate how to write basic unit tests and how to work with mocks.

These two subjects are quite nice and there is plenty of information around to find what we are looking for. However, we want to investigate another C# related subject about testing. Something that is cutting edge, quite new and is easy to explain to other students.

Who has some ideas about a third subject that we can investigate other than writing basic unit tests and mocking?

PS: we already looked into refactoring tests and different kinds of tests (unit, stress, load and usability).