C#/.NET Fundamentals: Unit Testing with Func<TResult> Generators

I wanted to attempt a brief post before the holidays, so I decided to quickly revisit part a post I wrote a few weeks back on The Generic Func Delegates, and in particular, the sidebar on using Func as a generator for unit testing. At the time, I did not give that short sidebar the attention I really wanted, including showing the setup of the unit tests and discussing the performance impact (if any) of such a practice. So this week I hope to rectify this by revisiting and enhancing the discussion.