This looks interesting, but I wonder how many test case descriptions could be declarative like the LDP test cases? If I understood correctly, your test suite also requires the bovine variant of the C2S protocol.
The first message in this topic mentions an S2S “test suite” with a few automated tests and a questionnaire.
I’m primarily interested in an S2S suite. It would probably need to be an AP S2S Core suite and one or more application or application domain-specific suites (Mastodon/microblogging, …).