Ajax toolkit and unit testing with JSUnit

Hi. I was wondering if it's at all possible to use the Ajax toolkit outside of an s-control to unit test functions (with jsunit) that make calls to the salesforce web services API. Ideally, I would like to do the following:

1. Launch my browser
2. Open my test page
3. Login to salesforce
4. Run my unit tests

Any feedback would be apprecitated.

Thanks much.