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.HashSet;
  import java.util.Optional;
  import java.util.Set;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public final class LeaderRecoveryStateTest {
      private static final byte NO_CHANGE = (byte) -1;
  
      @Test
      void testUniqueValues() {
          Set<Byte> set = new HashSet<>();
          for (LeaderRecoveryState recovery : LeaderRecoveryState.values()) {
              assertTrue(
                  set.add(recovery.value()),
                  String.format("Value %s for election state %s has already been used", recovery.value(), recovery)
              );
          }
      }
  
      @Test
      void testDoesNotContainNoChange() {
          for (LeaderRecoveryState recovery : LeaderRecoveryState.values()) {
              assertNotEquals(NO_CHANGE, recovery.value());
          }
      }
  
      @Test
      void testByteToLeaderRecoveryState() {
          assertEquals(LeaderRecoveryState.RECOVERED, LeaderRecoveryState.of((byte) 0));
          assertEquals(LeaderRecoveryState.RECOVERING, LeaderRecoveryState.of((byte) 1));
      }
  
      @Test
      void testLeaderRecoveryStateValue() {
          assertEquals(0, LeaderRecoveryState.RECOVERED.value());
          assertEquals(1, LeaderRecoveryState.RECOVERING.value());
      }
  
      @Test
      void testInvalidValue() {
          assertThrows(
              IllegalArgumentException.class,
              () -> LeaderRecoveryState.of(NO_CHANGE)
          );
          assertThrows(IllegalArgumentException.class, () -> LeaderRecoveryState.of((byte) 2));
      }
  
      @Test
      void testOptionalInvalidValue() {
          assertEquals(Optional.empty(), LeaderRecoveryState.optionalOf(NO_CHANGE));
          assertEquals(Optional.empty(), LeaderRecoveryState.optionalOf((byte) 2));
      }
  
      @Test
      void testChangeTo() {
          LeaderRecoveryState state = LeaderRecoveryState.RECOVERED;
          assertEquals(LeaderRecoveryState.RECOVERED, state.changeTo(NO_CHANGE));
          state = state.changeTo(LeaderRecoveryState.RECOVERING.value());
          assertEquals(LeaderRecoveryState.RECOVERING, state);
          assertEquals(LeaderRecoveryState.RECOVERING, state.changeTo(NO_CHANGE));
          state = state.changeTo(LeaderRecoveryState.RECOVERED.value());
          assertEquals(LeaderRecoveryState.RECOVERED, state);
      }
  }
  