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|
// These tests require the thread-local scoped dispatcher, which only works when
// we have a standard library. The behaviour being tested should be the same
// with the standard lib disabled.
//
// The alternative would be for each of these tests to be defined in a separate
// file, which is :(
#![cfg(feature = "std")]
use tracing::{
field::display,
span::{Attributes, Id, Record},
subscriber::{with_default, Interest, Subscriber},
Event, Level, Metadata,
};
use tracing_mock::{expect, subscriber};
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn event_macros_dont_infinite_loop() {
// This test ensures that an event macro within a subscriber
// won't cause an infinite loop of events.
struct TestSubscriber;
impl Subscriber for TestSubscriber {
fn register_callsite(&self, _: &Metadata<'_>) -> Interest {
// Always return sometimes so that `enabled` will be called
// (which can loop).
Interest::sometimes()
}
fn enabled(&self, meta: &Metadata<'_>) -> bool {
assert!(meta.fields().iter().any(|f| f.name() == "foo"));
tracing::event!(Level::TRACE, bar = false);
true
}
fn new_span(&self, _: &Attributes<'_>) -> Id {
Id::from_u64(0xAAAA)
}
fn record(&self, _: &Id, _: &Record<'_>) {}
fn record_follows_from(&self, _: &Id, _: &Id) {}
fn event(&self, event: &Event<'_>) {
assert!(event.metadata().fields().iter().any(|f| f.name() == "foo"));
tracing::event!(Level::TRACE, baz = false);
}
fn enter(&self, _: &Id) {}
fn exit(&self, _: &Id) {}
}
with_default(TestSubscriber, || {
tracing::event!(Level::TRACE, foo = false);
})
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn boxed_subscriber() {
let (subscriber, handle) = subscriber::mock()
.new_span(
expect::span().named("foo").with_field(
expect::field("bar")
.with_value(&display("hello from my span"))
.only(),
),
)
.enter(expect::span().named("foo"))
.exit(expect::span().named("foo"))
.drop_span(expect::span().named("foo"))
.only()
.run_with_handle();
let subscriber: Box<dyn Subscriber + Send + Sync + 'static> = Box::new(subscriber);
with_default(subscriber, || {
let from = "my span";
let span = tracing::span!(
Level::TRACE,
"foo",
bar = format_args!("hello from {}", from)
);
span.in_scope(|| {});
});
handle.assert_finished();
}
#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
#[test]
fn arced_subscriber() {
use std::sync::Arc;
let (subscriber, handle) = subscriber::mock()
.new_span(
expect::span().named("foo").with_field(
expect::field("bar")
.with_value(&display("hello from my span"))
.only(),
),
)
.enter(expect::span().named("foo"))
.exit(expect::span().named("foo"))
.drop_span(expect::span().named("foo"))
.event(
expect::event()
.with_fields(expect::field("message").with_value(&display("hello from my event"))),
)
.only()
.run_with_handle();
let subscriber: Arc<dyn Subscriber + Send + Sync + 'static> = Arc::new(subscriber);
// Test using a clone of the `Arc`ed subscriber
with_default(subscriber.clone(), || {
let from = "my span";
let span = tracing::span!(
Level::TRACE,
"foo",
bar = format_args!("hello from {}", from)
);
span.in_scope(|| {});
});
with_default(subscriber, || {
tracing::info!("hello from my event");
});
handle.assert_finished();
}
|
