use tokio::net::TcpStream; use tokio::sync::oneshot; use tokio::time::{timeout, Duration}; use futures::executor::block_on; use std::net::TcpListener; #[test] #[should_panic( expected = "there is no reactor running, must be called from the context of a Tokio 1.x runtime" )] fn timeout_panics_when_no_tokio_context() { block_on(timeout_value()); } #[test] #[should_panic( expected = "there is no reactor running, must be called from the context of a Tokio 1.x runtime" )] fn panics_when_no_reactor() { let srv = TcpListener::bind("127.0.0.1:0").unwrap(); let addr = srv.local_addr().unwrap(); block_on(TcpStream::connect(&addr)).unwrap(); } async fn timeout_value() { let (_tx, rx) = oneshot::channel::<()>(); let dur = Duration::from_millis(20); let _ = timeout(dur, rx).await; } #[test] #[should_panic( expected = "there is no reactor running, must be called from the context of a Tokio 1.x runtime" )] fn io_panics_when_no_tokio_context() { let _ = tokio::net::TcpListener::from_std(std::net::TcpListener::bind("127.0.0.1:0").unwrap()); }