assertThrows(ChannelLoadBalancer.NoAvailableChannelException.class, () -> loadBalancer.selectChannel(mockMessage));
    }

    @Test
    void testRoundRobinStrategy() {
        loadBalancer.setStrategy(LoadBalancingStrategy.ROUND_ROBIN);
        when(mockChannelManager.getHealthyChannels()).thenReturn(Arrays.asList(channel1, channel2));