if v, ok := err.(*RemoteErr); !ok || v.Error() != "Invalid Handler for type" {
			t.Fatalf("Unexpected error: %v, %T", err, err)
		}
		// Streams should not be able to set up until registered.
		// Thus, the error is a local error.
		_, err = remoteConn.NewStream(context.Background(), handlerTest, []byte(testPayload))
		if !errors.Is(err, ErrUnknownHandler) {