scoped_clobbers_default.rs

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#![cfg(feature = "std")]

use tracing_mock::*;

#[test]

fn scoped_clobbers_global() {

    // Reproduces https://github.com/tokio-rs/tracing/issues/2050

    let (scoped, scoped_handle) = subscriber::mock()

        .event(event::msg("before global"))

        .event(event::msg("before drop"))

        .done()

        .run_with_handle();

    let (global, global_handle) = subscriber::mock()

        .event(event::msg("after drop"))

        .done()

        .run_with_handle();

    // Set a scoped default subscriber, returning a guard.

    let guard = tracing::subscriber::set_default(scoped);

    tracing::info!("before global");

    // Now, set the global default.

    tracing::subscriber::set_global_default(global)

        .expect("global default should not already be set");

    // This event should still be collected by the scoped default.

    tracing::info!("before drop");

    // Drop the guard. Now, the global default subscriber should be used.

    drop(guard);

    tracing::info!("after drop");

    scoped_handle.assert_finished();

    global_handle.assert_finished();