}

        // Should eventually remove the channel
        verify(mockChannelManager, atLeast(1)).removeChannel(failedChannel);
        verify(mockChannelManager, atLeast(1)).establishReplacementChannel();
    }

    @Test
    void testShutdown() {
        failover.shutdown();

        // Should not throw any exceptions
        assertDoesNotThrow(() -> failover.shutdown());
    }

    }

    @Test
    void testEstablishReplacementChannel() {
        // Should not throw exception even when no interfaces are available
        assertDoesNotThrow(() -> channelManager.establishReplacementChannel());
    }

    @Test
    void testGetChannelForTransport() {
        ChannelInfo result = channelManager.getChannelForTransport(mockTransport);
        assertNull(result); // No channels registered yet

        manager.removeChannel(channel);
        failoverStates.remove(channel.getChannelId());

        // Try to establish a replacement channel
        manager.establishReplacementChannel();
    }

    /**
     * State tracking for channel failover
     */
    public static class FailoverState {

        private final String channelId;
        private final long failureTime;

        } catch (Exception e) {
            log.debug("Error disconnecting removed channel", e);
        }
    }

    /**
     * Establish a replacement channel
     */
    public void establishReplacementChannel() {
        if (!multiChannelEnabled)
            return;

        try {
            int currentChannels = channels.size();
            if (currentChannels < maxChannels && canEstablishMoreChannels()) {

        
        manager.removeChannel(channel);
        failoverStates.remove(channel.getChannelId());
        
        // Try to establish a replacement channel
        manager.establishReplacementChannel();
    }
}
```

## 5. Integration with Existing Code

### 5.1 Session Integration
```java
// In SmbSession.java
private ChannelManager channelManager;