ping: Add timeout to destinations

ping/destination_test.go

@@ -0,0 +1,24 @@
+package ping_test
+
+import (
+	"context"
+	"net/netip"
+	"testing"
+	"time"
+
+	"github.com/sagernet/sing-tun/ping"
+	"github.com/sagernet/sing/common/logger"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestIsClosed(t *testing.T) {
+	t.Parallel()
+	destination, err := ping.ConnectDestination(context.Background(), logger.NOP(), nil, netip.MustParseAddr("1.1.1.1"), nil, 30*time.Second)
+	require.NoError(t, err)
+	defer destination.Close()
+	time.Sleep(1 * time.Second)
+	require.False(t, destination.IsClosed())
+	destination.Close()
+	require.True(t, destination.IsClosed())
+}