Function render_tests_text 

pub fn render_tests_text(model: &TestsModel) -> String

Default devscout tests output. The zero case is a first-class answer, not an empty table: “nothing tests this” is exactly what the caller asked, and it is one line rather than a header over a void.

Heuristic file lines carry the SAME word-suffix the refs/impact renderers use, and the summary counts stay precise-only, so a file listed under a covered count is a file a test really references.