[Rust] How do I query function and module attributes?

I wanted to filter out tests from my results, based on if they either had a #[test] attribute or #[cfg(test)].

Currently tried something similar to this but cant figure out how to properly filter this from the docs

```ql
predicate doesntWork(Module mod, Attr a, Meta m) {
a = mod.getAnAttr() and
m = a.getMeta() and
m.hasPath() and
m.getPath().toString() = "cfg" and
m.hasTokenTree()
}
```