Web testing framework?

[Robb Shecter]

Anybody know about a Python library for testing websites?  I'm
thinking of something like a scriptable browser, where you could tell
it to browse to a certain URL, check for the existence of certain text
in a page, follow a certain link, etc.

I've begun writing my own (because it's so easy to do in Python), but
wondering if there's anything out there like this.

Thanks!
Robb