    @Test
    public void test_listClientRooms_unknown_socket() {

        final SocketIoAdapter adapter = ADAPTER_FACTORY.createAdapter(null);

        final SocketIoSocket socket1 = createDummySocket();
        final SocketIoSocket socket2 = createDummySocket();

        assertEquals(0, adapter.listClientRooms(socket1).length);
        assertEquals(0, adapter.listClientRooms(socket2).length);
    }