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   * 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
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
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  package org.apache.bifromq.mqtt.integration.v3;
  
  import static org.eclipse.paho.client.mqttv3.MqttException.REASON_CODE_INVALID_CLIENT_ID;
  import static org.mockito.ArgumentMatchers.argThat;
  import static org.mockito.Mockito.verify;
  import static org.testng.Assert.assertEquals;
  
  import org.apache.bifromq.mqtt.TestUtils;
  import org.apache.bifromq.mqtt.integration.MQTTTest;
  import org.apache.bifromq.mqtt.integration.v3.client.MqttTestClient;
  import org.apache.bifromq.plugin.eventcollector.mqttbroker.channelclosed.IdentifierRejected;
  import lombok.extern.slf4j.Slf4j;
  import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
  import org.eclipse.paho.client.mqttv3.MqttException;
  import org.testng.annotations.Test;
  
  @Slf4j
  public class MQTTBadConnectMessageTest extends MQTTTest {
      @Test(groups = "integration")
      public void testCleanSessionFalseAndEmptyClientIdentifier() {
          MqttTestClient mqttClient = new MqttTestClient(BROKER_URI, "");
  
          MqttConnectOptions connOpts = new MqttConnectOptions();
          connOpts.setMqttVersion(4);
          connOpts.setCleanSession(false);
          connOpts.setWill("/abc", new byte[] {}, 0, false);
          MqttException e = TestUtils.expectThrow(() -> mqttClient.connect(connOpts));
          assertEquals(e.getReasonCode(), REASON_CODE_INVALID_CLIENT_ID);
  
          verify(eventCollector).report(argThat(event -> event instanceof IdentifierRejected));
          mqttClient.close();
      }
  }
  