*/
    @Test
    public void testConcurrentListenerInvocation() throws Exception {
        // This test verifies CopyOnWriteArrayList allows safe iteration
        assertTrue("OnConnectListener list should be thread-safe",
                fesenClient.onConnectListenerList instanceof java.util.concurrent.CopyOnWriteArrayList);
    }

    /**
     * Test: Retry logic correctly enforces maxRetryCount

import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

 */
package org.codelibs.fess.crawler.client;

import static org.codelibs.core.stream.StreamUtil.split;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;

import org.apache.commons.lang3.RandomUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;