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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.common.serialization;
  
  import org.apache.kafka.clients.CommonClientConfigs;
  import org.apache.kafka.common.KafkaException;
  import org.apache.kafka.common.config.ConfigException;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertInstanceOf;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  
  public class ListSerializerTest {
      private final ListSerializer<?> listSerializer = new ListSerializer<>();
      private final Map<String, Object> props = new HashMap<>();
      private final String nonExistingClass = "non.existing.class";
      private static class FakeObject {
      }
  
      @Test
      public void testListKeySerializerNoArgConstructorsWithClassName() {
          props.put(CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_INNER_CLASS, Serdes.StringSerde.class.getName());
          listSerializer.configure(props, true);
          final Serializer<?> inner = listSerializer.getInnerSerializer();
          assertNotNull(inner, "Inner serializer should be not null");
          assertInstanceOf(StringSerializer.class, inner, "Inner serializer type should be StringSerializer");
      }
  
      @Test
      public void testListValueSerializerNoArgConstructorsWithClassName() {
          props.put(CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_INNER_CLASS, Serdes.StringSerde.class.getName());
          listSerializer.configure(props, false);
          final Serializer<?> inner = listSerializer.getInnerSerializer();
          assertNotNull(inner, "Inner serializer should be not null");
          assertInstanceOf(StringSerializer.class, inner, "Inner serializer type should be StringSerializer");
      }
  
      @Test
      public void testListKeySerializerNoArgConstructorsWithClassObject() {
          props.put(CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_INNER_CLASS, Serdes.StringSerde.class);
          listSerializer.configure(props, true);
          final Serializer<?> inner = listSerializer.getInnerSerializer();
          assertNotNull(inner, "Inner serializer should be not null");
          assertInstanceOf(StringSerializer.class, inner, "Inner serializer type should be StringSerializer");
      }
  
      @Test
      public void testListValueSerializerNoArgConstructorsWithClassObject() {
          props.put(CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_INNER_CLASS, Serdes.StringSerde.class);
          listSerializer.configure(props, false);
          final Serializer<?> inner = listSerializer.getInnerSerializer();
          assertNotNull(inner, "Inner serializer should be not null");
          assertInstanceOf(StringSerializer.class, inner, "Inner serializer type should be StringSerializer");
      }
  
      @Test
      public void testListSerializerNoArgConstructorsShouldThrowConfigExceptionDueMissingProp() {
          ConfigException exception = assertThrows(
              ConfigException.class,
              () -> listSerializer.configure(props, true)
          );
          assertEquals("Not able to determine the serializer class because it was neither passed via the constructor nor set in the config.", exception.getMessage());
  
          exception = assertThrows(
              ConfigException.class,
              () -> listSerializer.configure(props, false)
          );
          assertEquals("Not able to determine the serializer class because it was neither passed via the constructor nor set in the config.", exception.getMessage());
      }
  
      @Test
      public void testListKeySerializerNoArgConstructorsShouldThrowKafkaExceptionDueInvalidClass() {
          props.put(CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_INNER_CLASS, new FakeObject());
          final KafkaException exception = assertThrows(
              KafkaException.class,
              () -> listSerializer.configure(props, true)
          );
          assertEquals("Could not create a serializer class instance using \"" + CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_INNER_CLASS + "\" property.", exception.getMessage());
      }
  
      @Test
      public void testListValueSerializerNoArgConstructorsShouldThrowKafkaExceptionDueInvalidClass() {
          props.put(CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_INNER_CLASS, new FakeObject());
          final KafkaException exception = assertThrows(
              KafkaException.class,
              () -> listSerializer.configure(props, false)
          );
          assertEquals("Could not create a serializer class instance using \"" + CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_INNER_CLASS + "\" property.", exception.getMessage());
      }
  
      @Test
      public void testListKeySerializerNoArgConstructorsShouldThrowKafkaExceptionDueClassNotFound() {
          props.put(CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_INNER_CLASS, nonExistingClass);
          final KafkaException exception = assertThrows(
              KafkaException.class,
              () -> listSerializer.configure(props, true)
          );
          assertEquals("Invalid value non.existing.class for configuration " + CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_INNER_CLASS + ": Serializer class " + nonExistingClass + " could not be found.", exception.getMessage());
      }
  
      @Test
      public void testListValueSerializerNoArgConstructorsShouldThrowKafkaExceptionDueClassNotFound() {
          props.put(CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_INNER_CLASS, nonExistingClass);
          final KafkaException exception = assertThrows(
              KafkaException.class,
              () -> listSerializer.configure(props, false)
          );
          assertEquals("Invalid value non.existing.class for configuration " + CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_INNER_CLASS + ": Serializer class " + nonExistingClass + " could not be found.", exception.getMessage());
      }
  
      @Test
      public void testListKeySerializerShouldThrowConfigExceptionDueAlreadyInitialized() {
          props.put(CommonClientConfigs.DEFAULT_LIST_KEY_SERDE_INNER_CLASS, Serdes.StringSerde.class);
          final ListSerializer<Integer> initializedListSerializer = new ListSerializer<>(Serdes.Integer().serializer());
          final ConfigException exception = assertThrows(
              ConfigException.class,
              () -> initializedListSerializer.configure(props, true)
          );
          assertEquals("List serializer was already initialized using a non-default constructor", exception.getMessage());
      }
  
      @Test
      public void testListValueSerializerShouldThrowConfigExceptionDueAlreadyInitialized() {
          props.put(CommonClientConfigs.DEFAULT_LIST_VALUE_SERDE_INNER_CLASS, Serdes.StringSerde.class);
          final ListSerializer<Integer> initializedListSerializer = new ListSerializer<>(Serdes.Integer().serializer());
          final ConfigException exception = assertThrows(
              ConfigException.class,
              () -> initializedListSerializer.configure(props, false)
          );
          assertEquals("List serializer was already initialized using a non-default constructor", exception.getMessage());
      }
  
  }
  