content: /*
   * 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
   * limitations under the License.
   */
  
  package org.apache.kafka.metadata;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.List;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public final class LeaderAndIsrTest {
      @Test
      public void testRecoveringLeaderAndIsr() {
          LeaderAndIsr leaderAndIsr = new LeaderAndIsr(1, List.of(1, 2));
          LeaderAndIsr recoveringLeaderAndIsr = leaderAndIsr.newRecoveringLeaderAndIsr(3, List.of(3));
  
          assertEquals(3, recoveringLeaderAndIsr.leader());
          assertEquals(List.of(3), recoveringLeaderAndIsr.isr());
          assertEquals(LeaderRecoveryState.RECOVERING, recoveringLeaderAndIsr.leaderRecoveryState());
      }
  
      @Test
      public void testNewLeaderAndIsr() {
          LeaderAndIsr leaderAndIsr = new LeaderAndIsr(1, List.of(1, 2));
          LeaderAndIsr newLeaderAndIsr = leaderAndIsr.newLeaderAndIsr(2, List.of(1, 2));
  
          assertEquals(2, newLeaderAndIsr.leader());
          assertEquals(List.of(1, 2), newLeaderAndIsr.isr());
          assertEquals(LeaderRecoveryState.RECOVERED, newLeaderAndIsr.leaderRecoveryState());
      }
  
      @Test
      public void testNewLeader() {
          LeaderAndIsr leaderAndIsr = new LeaderAndIsr(2, List.of(1, 2, 3));
  
          assertEquals(2, leaderAndIsr.leader());
          assertEquals(List.of(1, 2, 3), leaderAndIsr.isr());
  
          LeaderAndIsr newLeaderAndIsr = leaderAndIsr.newLeader(3);
  
          assertEquals(3, newLeaderAndIsr.leader());
          assertEquals(List.of(1, 2, 3), newLeaderAndIsr.isr());
      }
  
      @Test
      public void testNewEpoch() {
          LeaderAndIsr leaderAndIsr = new LeaderAndIsr(3, List.of(1, 2, 3));
  
          assertEquals(0, leaderAndIsr.leaderEpoch());
  
          LeaderAndIsr leaderWithNewEpoch = leaderAndIsr.newEpoch();
  
          assertEquals(1, leaderWithNewEpoch.leaderEpoch());
      }
  
      @Test
      public void testLeaderOpt() {
          LeaderAndIsr leaderAndIsr = new LeaderAndIsr(2, List.of(1, 2, 3));
  
          assertEquals(2, leaderAndIsr.leaderOpt().orElse(0));
      }
  }
  