How to run tests in clojurescript

This is a stupid simple guide to setting up clojurescript tests. This was written out of sheer frustration at the lack of a simple guide to run cljs tests. This will not be a guide about the various configurations you can run tests with, or the various ways to run cljs tests or any of the fancy stuff. This is a guide I wished I had when I was trying to setup clojurescript tests.