diff --git a/multiaddr_test.go b/multiaddr_test.go
index cc0676a..3a60751 100644
--- a/multiaddr_test.go
+++ b/multiaddr_test.go
@@ -27,7 +27,10 @@ func TestConstructFails(t *testing.T) {
 		"/tcp/65536",
 		"/onion/9imaq4ygg2iegci7:80",
 		"/onion/aaimaq4ygg2iegci7:80",
+		"/onion/timaq4ygg2iegci7:0",
+		"/onion/timaq4ygg2iegci7:-1",
 		"/onion/timaq4ygg2iegci7",
+		"/onion/timaq4ygg2iegci@:666",
 		"/udp/1234/sctp",
 		"/udp/1234/udt/1234",
 		"/udp/1234/utp/1234",