update functional test and check warn message instead of a close channel

Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

lightning/src/ln/functional_tests.rs

@@ -7380,10 +7380,20 @@ fn test_data_loss_protect() {
 	}
 
 	// Check we close channel detecting A is fallen-behind
-	nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
-	check_closed_event!(nodes[1], 1, ClosureReason::ProcessingError { err: "Peer attempted to reestablish channel with a very old local commitment transaction".to_string() });
-	assert_eq!(check_closed_broadcast!(nodes[1], true).unwrap().data, "Peer attempted to reestablish channel with a very old local commitment transaction");
-	check_added_monitors!(nodes[1], 1);
+	// Check if we sent the warning message when we detecting that A is fallen-behind,
+	// and we give the possibility to A to  be able to recover from error.
+	for msg in nodes[1].node.get_and_clear_pending_msg_events() {
+		if let MessageSendEvent::HandleError { ref action, .. } = msg {
+			match action {
+				&ErrorAction::SendWarningMessage { ref msg, .. } => {
+					assert!(msg.data.contains(&"bad reestablish revocation_number".to_owned()));
+				},
+				_ => panic!("Unexpected event!"),
+			}
+		} else {
+			panic!("Unexpected event")
+		}
+	}
 
 	// Check A is able to claim to_remote output
 	let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap().clone();