I am an avid Sufjan Stevens fan. I really enjoy his peaceful, somewhat melancholy style of music. As a person who is not religious myself, one of the things that I find interesting about his songs is that religious - specifically Christian - themes seem to appear quite broadly across his oeuvre.

Today we will be talking about mocking. No, not the joke at someone else's expense kind. Mocking is a technique to temporarily replace real parts of our code with fake, simpler parts, so that we can check that the rest of the parts are working as we intend.