cool--I think a better choice would be describe() blocks, which would make the tests themselves show the appropriate headers above these tests when they print out.

One thing to consider though: the underscore tests will evolve over time (thanks to tweaks like your own getting accepted gradually). It would be nice if our code stayed as close to that original code as possible, so we don't have a lot to do to upgrade to the current version. If their tests don't have comments, it would be nice for our tests to be exactly the same, to minimize confusion during that upgrade process.