Is there a public test suite?
The entire specification (which is admittedly incomplete) and implementation are open source.
I am not aware of a dedicated test suite for alternative implementations. It's too early, IMHO. I personally would much prefer the team to focus their time elsewhere for the time being.
They already build off of many related specifications, which have independent implementations, and a lot of the core protocol is RPC style, with schemas that they do publish. So there's already a lot of rigidity here for alternative implementations to use in a way that is extremely likely to be compliant.
I guess another way of putting it is "I don't exactly disagree with you but doing that takes work, and we're at the stage of this stuff where that work is being done, so expecting it right now feels premature to me." The spec isn't "released" or "done," it's in development.