1 files changed, 15 insertions, 0 deletions
diff --git a/third_party/rust/tracing/tests/no_subscriber.rs b/third_party/rust/tracing/tests/no_subscriber.rs
new file mode 100644
index 0000000000..5f927c1dee
--- /dev/null
+++ b/third_party/rust/tracing/tests/no_subscriber.rs
@@ -0,0 +1,15 @@
+#![cfg(feature = "std")]
+
+use tracing::subscriber::{self, NoSubscriber};
+
+#[cfg_attr(target_arch = "wasm32", wasm_bindgen_test::wasm_bindgen_test)]
+#[test]
+fn no_subscriber_disables_global() {
+    // Reproduces https://github.com/tokio-rs/tracing/issues/1999
+    let (subscriber, handle) = tracing_mock::subscriber::mock().done().run_with_handle();
+    subscriber::set_global_default(subscriber).expect("setting global default must succeed");
+    subscriber::with_default(NoSubscriber::default(), || {
+        tracing::info!("this should not be recorded");
+    });
+    handle.assert_finished();
+}