I have a test site setup for testing, it uses a hard coded appkey and user for the test. You can see the site here:
http://nirvanixdev.appspot.com/
The site currently calls listfolder, and getOptimalUrls parsing the results into a file / folder structure. I will have the full test suite I am writing available as well on the site soon.
The wrapper allows any call not just those two, they are just an example to show a real world example.
Regards,
Barry R.