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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.
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  package org.apache.kafka.streams.processor.internals;
  
  import org.apache.kafka.common.Cluster;
  import org.apache.kafka.common.Node;
  import org.apache.kafka.common.PartitionInfo;
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.streams.processor.TaskId;
  import org.apache.kafka.streams.processor.internals.TopologyMetadata.Subtopology;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import static org.apache.kafka.streams.processor.internals.assignment.AssignmentTestUtils.SUBTOPOLOGY_0;
  import static org.apache.kafka.streams.processor.internals.assignment.AssignmentTestUtils.SUBTOPOLOGY_1;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class PartitionGrouperTest {
  
      private final List<PartitionInfo> infos = Arrays.asList(
              new PartitionInfo("topic1", 0, Node.noNode(), new Node[0], new Node[0]),
              new PartitionInfo("topic1", 1, Node.noNode(), new Node[0], new Node[0]),
              new PartitionInfo("topic1", 2, Node.noNode(), new Node[0], new Node[0]),
              new PartitionInfo("topic2", 0, Node.noNode(), new Node[0], new Node[0]),
              new PartitionInfo("topic2", 1, Node.noNode(), new Node[0], new Node[0])
      );
  
      private final Cluster metadata = new Cluster(
          "cluster",
          Collections.singletonList(Node.noNode()),
          infos,
          Collections.emptySet(),
          Collections.emptySet());
  
      @Test
      public void shouldComputeGroupingForTwoGroups() {
          final PartitionGrouper grouper = new PartitionGrouper();
          final Map<TaskId, Set<TopicPartition>> expectedPartitionsForTask = new HashMap<>();
          final Map<Subtopology, Set<String>> topicGroups = new HashMap<>();
  
          topicGroups.put(SUBTOPOLOGY_0, Set.of("topic1"));
          expectedPartitionsForTask.put(new TaskId(SUBTOPOLOGY_0.nodeGroupId, 0, SUBTOPOLOGY_0.namedTopology), Set.of(new TopicPartition("topic1", 0)));
          expectedPartitionsForTask.put(new TaskId(SUBTOPOLOGY_0.nodeGroupId, 1, SUBTOPOLOGY_0.namedTopology), Set.of(new TopicPartition("topic1", 1)));
          expectedPartitionsForTask.put(new TaskId(SUBTOPOLOGY_0.nodeGroupId, 2, SUBTOPOLOGY_0.namedTopology), Set.of(new TopicPartition("topic1", 2)));
  
          topicGroups.put(SUBTOPOLOGY_1, Set.of("topic2"));
          expectedPartitionsForTask.put(new TaskId(SUBTOPOLOGY_1.nodeGroupId, 0, SUBTOPOLOGY_1.namedTopology), Set.of(new TopicPartition("topic2", 0)));
          expectedPartitionsForTask.put(new TaskId(SUBTOPOLOGY_1.nodeGroupId, 1, SUBTOPOLOGY_1.namedTopology), Set.of(new TopicPartition("topic2", 1)));
  
          assertEquals(expectedPartitionsForTask, grouper.partitionGroups(topicGroups, metadata));
      }
  
      @Test
      public void shouldComputeGroupingForSingleGroupWithMultipleTopics() {
          final PartitionGrouper grouper = new PartitionGrouper();
          final Map<TaskId, Set<TopicPartition>> expectedPartitionsForTask = new HashMap<>();
          final Map<Subtopology, Set<String>> topicGroups = new HashMap<>();
  
          topicGroups.put(SUBTOPOLOGY_0, Set.of("topic1", "topic2"));
          expectedPartitionsForTask.put(
              new TaskId(SUBTOPOLOGY_0.nodeGroupId, 0, SUBTOPOLOGY_0.namedTopology),
              Set.of(new TopicPartition("topic1", 0), new TopicPartition("topic2", 0)));
          expectedPartitionsForTask.put(
              new TaskId(SUBTOPOLOGY_0.nodeGroupId, 1,  SUBTOPOLOGY_0.namedTopology),
              Set.of(new TopicPartition("topic1", 1), new TopicPartition("topic2", 1)));
          expectedPartitionsForTask.put(
                  new TaskId(SUBTOPOLOGY_0.nodeGroupId, 2,  SUBTOPOLOGY_0.namedTopology),
              Set.of(new TopicPartition("topic1", 2)));
  
          assertEquals(expectedPartitionsForTask, grouper.partitionGroups(topicGroups, metadata));
      }
  
      @Test
      public void shouldNotCreateAnyTasksBecauseOneTopicHasUnknownPartitions() {
          final PartitionGrouper grouper = new PartitionGrouper();
          final Map<Subtopology, Set<String>> topicGroups = new HashMap<>();
      
          topicGroups.put(SUBTOPOLOGY_0, Set.of("topic1", "unknownTopic", "topic2"));
          assertThrows(RuntimeException.class, () -> grouper.partitionGroups(topicGroups, metadata));
      }
  }
  