Is There a Language Agnostic Tree Library?

I do remember some people talking about this a few years ago, I think it was music actually sounds familiar, the name. There were some like language agnostic communication testing framework they were using. Have you guys ever played around with, what is that testing call? We just threw a bunch of random inputs, basically chaos monkey, your stuff? Property testing. Not an elixir. But there's something called prop, propier or something like that in the other land. Proper. It's, but it's an Erlang thing. You can't use it on a lixxer, of course, as usual,. The library isn't specifically built for Lixxer. Only