#[test]s on non top-level functions. #29182
Description
It would be nice if we could implement test cases directly on a type that they test. This is especially useful when generating code (and test cases) with macros.
In the example below, the expected result would be Unit::my_important_test when testing.
struct Unit;
impl Unit {
#[test]
fn my_important_test() { /* ... */ }
}Alternatively one can just create a non_camel_case module sharing the same identifier as the struct. But this looks off for that exact reason. And abuses the bug as reported in #29185.
#[cfg(test)] #[allow(non_camel_case)]
mod Unit {
#[test]
fn my_important_test() { /* ... */ }
}