Ask HN: How to Write Language-Agnostic Test Conditions for Any Test Framework?

I like writing test conditions (given this input, expect this output) for specs and algorithms - my current obsession is with RFC 3986. Since the subject is language-agnostic I'd like to make them usable by everyone no matter which programming language or testing framework they use.

Is there an established way to do this, to make them useful for people working with multiple testing frameworks?