Attempt at a test for description + type properties for PR #75 (Which fi...

...xes #64)

My attempt at a test for a PR as requested by @jcrugzz. 

I don't have a lot of experience with writing tests in node and specially not with `vows`, so this might be utter crap. But I thought I would try to help out as best I could.

The tests fails per default, and works when patch from #75 is applied.

Hope it isn't all bad :)