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.clients.consumer;
  
  import org.apache.kafka.common.utils.Serializer;
  
  import org.junit.jupiter.api.Test;
  
  import java.io.IOException;
  import java.util.Optional;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  /**
   * This test case ensures OffsetAndMetadata 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 OffsetAndMetadataTest {
  
      @Test
      public void testInvalidNegativeOffset() {
          assertThrows(IllegalArgumentException.class, () -> new OffsetAndMetadata(-239L, Optional.of(15), ""));
      }
  
      @Test
      public void testSerializationRoundtrip() throws IOException, ClassNotFoundException {
          checkSerde(new OffsetAndMetadata(239L, Optional.of(15), "blah"));
          checkSerde(new OffsetAndMetadata(239L, "blah"));
          checkSerde(new OffsetAndMetadata(239L));
      }
  
      private void checkSerde(OffsetAndMetadata offsetAndMetadata) throws IOException, ClassNotFoundException {
          byte[] bytes =  Serializer.serialize(offsetAndMetadata);
          OffsetAndMetadata deserialized = (OffsetAndMetadata) Serializer.deserialize(bytes);
          assertEquals(offsetAndMetadata, deserialized);
      }
  
      @Test
      public void testDeserializationCompatibilityBeforeLeaderEpoch() throws IOException, ClassNotFoundException {
          String fileName = "serializedData/offsetAndMetadataBeforeLeaderEpoch";
          Object deserializedObject = Serializer.deserialize(fileName);
          assertEquals(new OffsetAndMetadata(10, "test commit metadata"), deserializedObject);
      }
  
      @Test
      public void testDeserializationCompatibilityWithLeaderEpoch() throws IOException, ClassNotFoundException {
          String fileName = "serializedData/offsetAndMetadataWithLeaderEpoch";
          Object deserializedObject = Serializer.deserialize(fileName);
          assertEquals(new OffsetAndMetadata(10, Optional.of(235), "test commit metadata"), deserializedObject);
      }
  
  }
  