signal: remove oneshot channels from tests (#7015)

tokio/tests/signal_ctrl_c.rs

@@ -9,23 +9,15 @@ mod support {
 use support::signal::send_signal;
 
 use tokio::signal;
-use tokio::sync::oneshot;
 use tokio_test::assert_ok;
 
 #[tokio::test]
 async fn ctrl_c() {
     let ctrl_c = signal::ctrl_c();
 
-    let (fire, wait) = oneshot::channel();
-
-    // NB: simulate a signal coming in by exercising our signal handler
-    // to avoid complications with sending SIGINT to the test process
     tokio::spawn(async {
-        wait.await.expect("wait failed");
         send_signal(libc::SIGINT);
     });
 
-    let _ = fire.send(());
-
     assert_ok!(ctrl_c.await);
 }

tokio/tests/signal_info.rs

@@ -17,24 +17,16 @@ use support::signal::send_signal;
 
 use tokio::signal;
 use tokio::signal::unix::SignalKind;
-use tokio::sync::oneshot;
 use tokio::time::{timeout, Duration};
 
 #[tokio::test]
 async fn siginfo() {
     let mut sig = signal::unix::signal(SignalKind::info()).expect("installed signal handler");
 
-    let (fire, wait) = oneshot::channel();
-
-    // NB: simulate a signal coming in by exercising our signal handler
-    // to avoid complications with sending SIGINFO to the test process
     tokio::spawn(async {
-        wait.await.expect("wait failed");
         send_signal(libc::SIGINFO);
     });
 
-    let _ = fire.send(());
-
     // Add a timeout to ensure the test doesn't hang.
     timeout(Duration::from_secs(5), sig.recv())
         .await