Github user jbertram commented on a diff in the pull request:

    https://github.com/apache/activemq-artemis/pull/2466#discussion_r246563323
  
    --- Diff: 
tests/integration-tests/src/test/java/org/apache/activemq/artemis/tests/integration/mqtt/imported/MQTTQueueCleanTest.java
 ---
    @@ -0,0 +1,109 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements. See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License. You may obtain a copy of the License at
    + * <p>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p>
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.activemq.artemis.tests.integration.mqtt.imported;
    +
    +import org.apache.activemq.artemis.api.core.SimpleString;
    +import org.apache.activemq.artemis.core.postoffice.Binding;
    +import org.apache.activemq.artemis.core.postoffice.PostOffice;
    +import org.apache.activemq.artemis.core.server.ActiveMQServer;
    +import org.apache.activemq.artemis.core.server.ActiveMQServerLogger;
    +import org.apache.activemq.artemis.core.server.Queue;
    +import org.junit.Test;
    +
    +import java.util.HashSet;
    +import java.util.Random;
    +import java.util.Set;
    +
    +public class MQTTQueueCleanTest extends MQTTTestSupport {
    +
    +   private static final ActiveMQServerLogger log = 
ActiveMQServerLogger.LOGGER;
    +
    +   @Test
    +   public void testQueueCleanWhenConnectionSynExeConnectAndDisconnect() 
throws Exception {
    +      Random random = new Random();
    +      Set<MQTTClientProvider> clientProviders = new HashSet<>(11);
    +      int repeatCount = 0;
    +      String address = "clean/test";
    +      String clientId = "sameClientId";
    +      String queueName = "::sameClientId.clean.test";
    +      //The abnormal scene does not necessarily occur, repeating 100 times 
to ensure the recurrence of the abnormality
    +      while (repeatCount < 100) {
    +         repeatCount++;
    +         int subConnectionCount = random.nextInt(50) + 1;
    +         int sC = 0;
    +         try {
    +            //Reconnect at least twice to reproduce the problem
    +            while (sC < subConnectionCount) {
    +               sC++;
    +               MQTTClientProvider clientProvider = getMQTTClientProvider();
    +               clientProvider.setClientId(clientId);
    +               initializeConnection(clientProvider);
    +               clientProviders.add(clientProvider);
    +               clientProvider.subscribe(address, AT_LEAST_ONCE);
    +            }
    +         } finally {
    +            for (MQTTClientProvider clientProvider : clientProviders) {
    +               clientProvider.disconnect();
    +            }
    +            clientProviders.clear();
    +            assertTrue(waitForBindings(server, queueName, false, 0, 0, 
10000));
    --- End diff --
    
    From what I can tell the overridden version of `waitForBindings` isn't 
necessary. You could just use something like:
    
    `assertTrue(Wait.waitFor(() -> 
server.locateQueue(SimpleString.toSimpleString(queueName)) == null));`


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