This pages suggests using the extension-unittests-generic, and most extensions seem to use only the extension-quibble template, but others have extension-coverage, extension-seccheck, extension-jsduck, etc. which sound like the sorts of things that might be useful. Then there's confusing ones like extension-quibble-composer and extension-gate which seem at first glance to be probably included in extension-quibble. (Maybe?)
Would it be worth adding a short list of available templates to this page, and describing them briefly?