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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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
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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
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   * Unless required by applicable law or agreed to in writing, software
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  package org.apache.cassandra.gms;
  
  import java.net.UnknownHostException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.UUID;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.ServerTestUtils;
  import org.apache.cassandra.Util;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.db.commitlog.CommitLog;
  import org.apache.cassandra.dht.RandomPartitioner;
  import org.apache.cassandra.dht.Token;
  import org.apache.cassandra.distributed.test.log.ClusterMetadataTestHelper;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.tcm.ClusterMetadata;
  
  import static org.apache.cassandra.config.CassandraRelevantProperties.MAX_LOCAL_PAUSE_IN_MS;
  import static org.junit.Assert.assertFalse;
  
  public class FailureDetectorTest
  {
      @BeforeClass
      public static void setup()
      {
          DatabaseDescriptor.daemonInitialization();
          DatabaseDescriptor.setPartitionerUnsafe(RandomPartitioner.instance);
          // slow unit tests can cause problems with FailureDetector's GC pause handling
          MAX_LOCAL_PAUSE_IN_MS.setLong(20000);
          ServerTestUtils.prepareServerNoRegister();
          CommitLog.instance.start();
      }
  
      @Test
      public void testConvictAfterLeft() throws UnknownHostException
      {
          ArrayList<Token> endpointTokens = new ArrayList<>();
          ArrayList<Token> keyTokens = new ArrayList<>();
          List<InetAddressAndPort> hosts = new ArrayList<>();
          List<UUID> hostIds = new ArrayList<>();
  
          // we want to convict if there is any heartbeat data present in the FD
          DatabaseDescriptor.setPhiConvictThreshold(0);
  
          // create a ring of 2 nodes
          Util.createInitialRing(endpointTokens, keyTokens, hosts, hostIds, 3);
  
          InetAddressAndPort leftHost = hosts.get(1);
  
          FailureDetector.instance.report(leftHost);
  
          ClusterMetadataTestHelper.removeEndpoint(leftHost, true);
  
          // confirm that handleStateLeft was called and leftEndpoint was removed from TokenMetadata
          assertFalse("Left endpoint not removed from ClusterMetadata", ClusterMetadata.current().directory.allJoinedEndpoints().contains(leftHost));
  
          // confirm the FD's history for leftHost didn't get wiped by status jump to LEFT
          FailureDetector.instance.interpret(leftHost);
          assertFalse("Left endpoint not convicted", FailureDetector.instance.isAlive(leftHost));
      }
  }
  