vendor/tracing-subscriber/tests/option.rs


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#![cfg(feature = "registry")]
use tracing::level_filters::LevelFilter;
use tracing::Subscriber;
use tracing_subscriber::prelude::*;

// This test is just used to compare to the tests below
#[test]
fn just_layer() {
    let subscriber = tracing_subscriber::registry().with(LevelFilter::INFO);
    assert_eq!(subscriber.max_level_hint(), Some(LevelFilter::INFO));
}

#[test]
fn subscriber_and_option_some_layer() {
    let subscriber = tracing_subscriber::registry()
        .with(LevelFilter::INFO)
        .with(Some(LevelFilter::DEBUG));
    assert_eq!(subscriber.max_level_hint(), Some(LevelFilter::DEBUG));
}

#[test]
fn subscriber_and_option_none_layer() {
    // None means the other layer takes control
    let subscriber = tracing_subscriber::registry()
        .with(LevelFilter::ERROR)
        .with(None::<LevelFilter>);
    assert_eq!(subscriber.max_level_hint(), Some(LevelFilter::ERROR));
}

#[test]
fn just_option_some_layer() {
    // Just a None means everything is off
    let subscriber = tracing_subscriber::registry().with(None::<LevelFilter>);
    assert_eq!(subscriber.max_level_hint(), Some(LevelFilter::OFF));
}

#[test]
fn just_option_none_layer() {
    let subscriber = tracing_subscriber::registry().with(Some(LevelFilter::ERROR));
    assert_eq!(subscriber.max_level_hint(), Some(LevelFilter::ERROR));
}