From a quick glance over Crockford's other repositories on GitHub, it doesn't seem like any of them have unit tests. Is this something he's known for not believing in?
I thought he may have used JSDev[1] to do some unit testing (which I understand why he set it up but it feels so awkward to me) but I don't see anything. No idea; he's certainly talked about the privacy of closing methods and unit testing but I thought he still did it just with JSDev.
[1] https://github.com/douglascrockford/JSDev