YUI 3.0 Keeping test cases in different files

In this thread Nicholas Zakas explains how to keep test cases in separate files (instead of using just one file). I tried his solution and it worked... for a few minutes.

YUI 3.0 was supposed to be released one year ago, yet their documentation is not as good as it used to be (like in YUI 2.0). This is one of the reasons I prefer YUI 2.0. It's not as painful as learning Dojo, but it has (what I consider) major changes that are not explained in their documentation. How do they expect us to use their tools?