test: fix flaky test_webxdc_resend

src/peer_channels.rs

@@ -990,10 +990,19 @@ mod tests {
         alice.recv_msg_trash(&fiona_advert).await;
 
         fiona_connect_future.await.unwrap();
+
+        let realtime_send_loop = async {
+            // Keep sending in a loop because right after joining
+            // Fiona may miss messages.
+            loop {
                 send_webxdc_realtime_data(alice, instance.id, b"alice -> bob & fiona".into())
                     .await
                     .unwrap();
+                tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+            }
+        };
 
+        let realtime_receive_loop = async {
             loop {
                 let event = fiona.evtracker.recv().await.unwrap();
                 if let EventType::WebxdcRealtimeData { data, .. } = event.typ {
@@ -1007,6 +1016,15 @@ mod tests {
                     }
                 }
             }
+        };
+        tokio::select!(
+            _ = realtime_send_loop => {
+                panic!("Send loop should never finish");
+            },
+            _ = realtime_receive_loop => {
+                return;
+            }
+        );
     }
 
     async fn connect_alice_bob(