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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
   *
   * 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
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  package org.apache.cassandra.locator;
  
  import org.apache.cassandra.dht.Murmur3Partitioner;
  import org.apache.cassandra.dht.Token;
  import org.junit.Assert;
  import org.junit.Test;
  
  import static org.apache.cassandra.locator.ReplicaUtils.*;
  
  public class ReplicaLayoutTest
  {
      @Test
      public void testConflictResolution()
      {
          final Token token = new Murmur3Partitioner.LongToken(1L);
          final Replica f1 = Replica.fullReplica(EP1, R1);
          final Replica f2 = Replica.fullReplica(EP2, R1);
          final Replica t2 = Replica.transientReplica(EP2, R1);
          final Replica f3 = Replica.fullReplica(EP3, R1);
          final Replica t4 = Replica.transientReplica(EP4, R1);
  
          {
              // test no conflict
              EndpointsForToken natural = EndpointsForToken.of(token, f1, f3);
              EndpointsForToken pending = EndpointsForToken.of(token, t2, t4);
              Assert.assertFalse(ReplicaLayout.haveWriteConflicts(natural, pending));
          }
          {
              // test full in natural, transient in pending
              EndpointsForToken natural = EndpointsForToken.of(token, f1, f2, f3);
              EndpointsForToken pending = EndpointsForToken.of(token, t2, t4);
              EndpointsForToken expectNatural = natural;
              EndpointsForToken expectPending = EndpointsForToken.of(token, t4);
              Assert.assertTrue(ReplicaLayout.haveWriteConflicts(natural, pending));
              assertEquals(expectNatural, ReplicaLayout.resolveWriteConflictsInNatural(natural, pending));
              assertEquals(expectPending, ReplicaLayout.resolveWriteConflictsInPending(natural, pending));
          }
          {
              // test transient in natural, full in pending
              EndpointsForToken natural = EndpointsForToken.of(token, f1, t2, f3);
              EndpointsForToken pending = EndpointsForToken.of(token, f2, t4);
              EndpointsForToken expectNatural = EndpointsForToken.of(token, f1, f2, f3);
              EndpointsForToken expectPending = EndpointsForToken.of(token, t4);
              Assert.assertTrue(ReplicaLayout.haveWriteConflicts(natural, pending));
              assertEquals(expectNatural, ReplicaLayout.resolveWriteConflictsInNatural(natural, pending));
              assertEquals(expectPending, ReplicaLayout.resolveWriteConflictsInPending(natural, pending));
          }
      }
  
      private static void assertEquals(AbstractReplicaCollection<?> a, AbstractReplicaCollection<?> b)
      {
          Assert.assertEquals(a.list, b.list);
      }
  
  }
  