1use tracing::Level;
2use tracing_mock::*;
3
4#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
5#[test]
6fn max_level_hints() {
7 // This test asserts that when a subscriber provides us with the global
8 // maximum level that it will enable (by implementing the
9 // `Subscriber::max_level_hint` method), we will never call
10 // `Subscriber::enabled` for events above that maximum level.
11 //
12 // In this case, we test that by making the `enabled` method assert that no
13 // `Metadata` for spans or events at the `TRACE` or `DEBUG` levels.
14 let (subscriber, handle) = subscriber::mock()
15 .with_max_level_hint(Level::INFO)
16 .with_filter(|meta| {
17 assert!(
18 dbg!(meta).level() <= &Level::INFO,
19 "a TRACE or DEBUG event was dynamically filtered: "
20 );
21 true
22 })
23 .event(expect::event().at_level(Level::INFO))
24 .event(expect::event().at_level(Level::WARN))
25 .event(expect::event().at_level(Level::ERROR))
26 .only()
27 .run_with_handle();
28
29 tracing::subscriber::set_global_default(subscriber).unwrap();
30
31 tracing::info!("doing a thing that you might care about");
32 tracing::debug!("charging turboencabulator with interocitor");
33 tracing::warn!("extremely serious warning, pay attention");
34 tracing::trace!("interocitor charge level is 10%");
35 tracing::error!("everything is on fire");
36 handle.assert_finished();
37}
38