client.clickLink() is used to click a link that was created using the JSF <h:outputLink> tag.
The reason no component ID was found for _id35:tabIdx_0 is because the markup was not generated with JSF. ClientIDs looks at the server side to find all of JSF client IDs.
For what you are wanting to do, I think you will need the new version. You can build it from SVN and try it out. Or you can wait a few weeks for Beta 3. This will be done before the end of August.
See some of the posts at the beginning of this forum to get started with the new JSFUnit.
Many thanks for that Stan,
Yes indeed, we are using Oracle's ADF Faces which is why the output from the jsp pages looks as it does.
The new JSFUnit sounds excellent and I look forward to trying it out.