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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
   * limitations under the License.
   */
  
  package org.apache.kafka.controller;
  
  import org.apache.kafka.metadata.VersionRange;
  import org.apache.kafka.server.common.Feature;
  import org.apache.kafka.server.common.MetadataVersion;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.ValueSource;
  
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class QuorumFeaturesTest {
      private static final Map<String, VersionRange> LOCAL = Map.of(
          "foo", VersionRange.of(0, 3),
          "bar", VersionRange.of(0, 4),
          "baz", VersionRange.of(2, 2)
      );
  
      private static final QuorumFeatures QUORUM_FEATURES = new QuorumFeatures(0, LOCAL,
          List.of(0, 1, 2));
  
      @Test
      public void testDefaultFeatureMap() {
          Map<String, VersionRange> expectedFeatures = new HashMap<>(1);
          expectedFeatures.put(MetadataVersion.FEATURE_NAME, VersionRange.of(
              MetadataVersion.MINIMUM_VERSION.featureLevel(),
              MetadataVersion.LATEST_PRODUCTION.featureLevel()));
          for (Feature feature : Feature.PRODUCTION_FEATURES) {
              short maxVersion = feature.latestProduction();
              if (maxVersion > 0) {
                  expectedFeatures.put(feature.featureName(), VersionRange.of(
                      feature.minimumProduction(),
                      maxVersion
                  ));
              }
          }
          assertEquals(expectedFeatures, QuorumFeatures.defaultSupportedFeatureMap(false));
      }
  
      @Test
      public void testDefaultFeatureMapWithUnstable() {
          Map<String, VersionRange> expectedFeatures = new HashMap<>(1);
          expectedFeatures.put(MetadataVersion.FEATURE_NAME, VersionRange.of(
              MetadataVersion.MINIMUM_VERSION.featureLevel(),
              MetadataVersion.latestTesting().featureLevel()));
          for (Feature feature : Feature.PRODUCTION_FEATURES) {
              short maxVersion = feature.defaultLevel(MetadataVersion.latestTesting());
              if (maxVersion > 0) {
                  expectedFeatures.put(feature.featureName(), VersionRange.of(
                      feature.minimumProduction(),
                      maxVersion
                  ));
              }
          }
          assertEquals(expectedFeatures, QuorumFeatures.defaultSupportedFeatureMap(true));
      }
  
      @ParameterizedTest
      @ValueSource(booleans = {true, false})
      public void ensureDefaultSupportedFeaturesRangeMaxNotZero(boolean unstableVersionsEnabled) {
          Map<String, VersionRange> quorumFeatures = QuorumFeatures.defaultSupportedFeatureMap(unstableVersionsEnabled);
          for (VersionRange range : quorumFeatures.values()) {
              assertNotEquals(0, range.max());
          }
      }
  
      @Test
      public void testLocalSupportedFeature() {
          assertEquals(VersionRange.of(0, 3), QUORUM_FEATURES.localSupportedFeature("foo"));
          assertEquals(VersionRange.of(0, 4), QUORUM_FEATURES.localSupportedFeature("bar"));
          assertEquals(VersionRange.of(2, 2), QUORUM_FEATURES.localSupportedFeature("baz"));
          assertEquals(VersionRange.of(0, 0), QUORUM_FEATURES.localSupportedFeature("quux"));
      }
  
      @Test
      public void testReasonNotSupported() {
          assertEquals(Optional.of("Local controller 0 only supports versions 0-3"),
              QuorumFeatures.reasonNotSupported((short) 10,
                  "Local controller 0", VersionRange.of(0, 3)));
          assertEquals(Optional.empty(),
              QuorumFeatures.reasonNotSupported((short) 3,
                  "Local controller 0", VersionRange.of(0, 3)));
      }
  
      @Test
      public void testIsControllerId() {
          assertTrue(QUORUM_FEATURES.isControllerId(0));
          assertTrue(QUORUM_FEATURES.isControllerId(1));
          assertTrue(QUORUM_FEATURES.isControllerId(2));
          assertFalse(QUORUM_FEATURES.isControllerId(3));
      }
  }
  