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.common;
  
  import org.apache.kafka.common.utils.Serializer;
  
  import org.junit.jupiter.api.Test;
  
  import java.io.IOException;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  
  /**
   * This test ensures TopicPartition class is serializable and is serialization compatible.
   * Note: this ensures that the current code can deserialize data serialized with older versions of the code, but not the reverse.
   * That is, older code won't necessarily be able to deserialize data serialized with newer code.
   */
  public class TopicPartitionTest {
      private final String topicName = "mytopic";
      private final int partNum = 5;
  
      private void checkValues(TopicPartition deSerTP) {
          //assert deserialized values are same as original
          assertEquals(partNum, deSerTP.partition(), "partition number should be " + partNum + " but got " + deSerTP.partition());
          assertEquals(topicName, deSerTP.topic(), "topic should be " + topicName + " but got " + deSerTP.topic());
      }
  
      @Test
      public void testSerializationRoundtrip() throws IOException, ClassNotFoundException {
          //assert TopicPartition is serializable and deserialization renders the clone of original properly
          TopicPartition origTp = new TopicPartition(topicName, partNum);
          byte[] byteArray = Serializer.serialize(origTp);
  
          //deserialize the byteArray and check if the values are same as original
          Object deserializedObject = Serializer.deserialize(byteArray);
          assertInstanceOf(TopicPartition.class, deserializedObject);
          checkValues((TopicPartition) deserializedObject);
      }
  
      @Test
      public void testTopiPartitionSerializationCompatibility() throws IOException, ClassNotFoundException {
          // assert serialized TopicPartition object in file (serializedData/topicPartitionSerializedfile) is
          // deserializable into TopicPartition and is compatible
          Object deserializedObject = Serializer.deserialize("serializedData/topicPartitionSerializedfile");
          assertInstanceOf(TopicPartition.class, deserializedObject);
          checkValues((TopicPartition) deserializedObject);
      }
  }
  