Declare test cases once, use them multiple times

Is there a way to declare test cases only once and use them multiple times across multiple functions in multiple files? I read the wiki but I didn't see anything like that. If there isn't, that might be a feature worth adding.

Start by reviewing the repository wiki and the existing test-case procedural macro behavior. Determine whether test cases can be declared once and reused by multiple functions across files; done means a concrete, maintainable design and agreed behavior for that reuse.

Written by the indexing model from the issue text.