import org.codelibs.fess.util.ComponentUtil;
import org.codelibs.fess.util.SearchEngineUtil;
import org.lastaflute.di.exception.IORuntimeException;
import org.opensearch.action.admin.cluster.health.ClusterHealthResponse;
import org.opensearch.cluster.health.ClusterHealthStatus;
import org.opensearch.common.xcontent.XContentType;

/**
 * Response entity for ping operations.
 */
public class PingResponse {

     * @throws NoAvailableChannelException if no healthy channels available
     */
    public ChannelInfo selectChannel(CommonServerMessageBlock message) throws NoAvailableChannelException {
        Collection<ChannelInfo> availableChannels = manager.getHealthyChannels();

        if (availableChannels.isEmpty()) {
            throw new NoAvailableChannelException("No healthy channels available");
        }

        when(mockRequest.getTreeId()).thenReturn(123);

        // Should throw NoAvailableChannelException when no healthy channels
        assertThrows(ChannelLoadBalancer.NoAvailableChannelException.class, () -> loadBalancer.selectChannel(mockRequest),
                "Should throw exception when no healthy channels available");
    }

#### 2. Start Fess Server

    $ unzip target/releases/fess-*.zip
    $ ./fess-*/bin/fess &

Wait for Fess to be ready (this may take up to 60 seconds):

    $ curl -s "http://localhost:8080/api/v1/health"

You should see a JSON response when Fess is ready.

#### 3. Clone Test Data

Required for SearchApiTests:

    $ git clone https://github.com/codelibs/fess-testdata.git /tmp/fess-testdata

    }

    @Test
    void testGetHealthyChannels() throws UnknownHostException {
        assertTrue(channelManager.getHealthyChannels().isEmpty());

        // Add a healthy channel manually for testing
        InetAddress addr = InetAddress.getByName("192.168.1.100");
        NetworkInterfaceInfo localInterface = new NetworkInterfaceInfo(addr, 1000);

        assertEquals("adaptive", config.getLoadBalancingStrategy(), "Default strategy should be adaptive");
        assertEquals(10, config.getChannelHealthCheckInterval(), "Default health check interval should be 10");
    }

    @Test
    void testMultiChannelEnabledProperty() throws CIFSException {
        Properties props = new Properties();