1 #![cfg(all(feature = "env-filter", feature = "fmt"))]
2 use tracing::{self, subscriber::with_default, Span};
3 use tracing_subscriber::{filter::EnvFilter, FmtSubscriber};
4
5 #[test]
duplicate_spans()6 fn duplicate_spans() {
7 let subscriber = FmtSubscriber::builder()
8 .with_env_filter(EnvFilter::new("[root]=debug"))
9 .finish();
10
11 with_default(subscriber, || {
12 let root = tracing::debug_span!("root");
13 root.in_scope(|| {
14 // root:
15 assert_eq!(root, Span::current(), "Current span must be 'root'");
16 let leaf = tracing::debug_span!("leaf");
17 leaf.in_scope(|| {
18 // root:leaf:
19 assert_eq!(leaf, Span::current(), "Current span must be 'leaf'");
20 root.in_scope(|| {
21 // root:leaf:
22 assert_eq!(
23 leaf,
24 Span::current(),
25 "Current span must be 'leaf' after entering twice the 'root' span"
26 );
27 })
28 });
29 // root:
30 assert_eq!(
31 root,
32 Span::current(),
33 "Current span must be root ('leaf' exited, nested 'root' exited)"
34 );
35
36 root.in_scope(|| {
37 assert_eq!(root, Span::current(), "Current span must be root");
38 });
39 // root:
40 assert_eq!(
41 root,
42 Span::current(),
43 "Current span must still be root after exiting nested 'root'"
44 );
45 });
46 });
47 }
48