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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.streams.kstream.internals;
  
  import org.apache.kafka.common.serialization.IntegerSerializer;
  import org.apache.kafka.common.serialization.Serdes;
  import org.apache.kafka.common.serialization.StringSerializer;
  import org.apache.kafka.streams.KeyValueTimestamp;
  import org.apache.kafka.streams.StreamsBuilder;
  import org.apache.kafka.streams.TestInputTopic;
  import org.apache.kafka.streams.TopologyTestDriver;
  import org.apache.kafka.streams.kstream.Consumed;
  import org.apache.kafka.streams.kstream.KStream;
  import org.apache.kafka.streams.kstream.ValueMapperWithKey;
  import org.apache.kafka.test.MockApiProcessorSupplier;
  import org.apache.kafka.test.StreamsTestUtils;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Properties;
  
  import static org.junit.jupiter.api.Assertions.assertArrayEquals;
  
  public class KStreamMapValuesTest {
      private final String topicName = "topic";
      private final MockApiProcessorSupplier<Integer, Integer, Void, Void> supplier = new MockApiProcessorSupplier<>();
      private final Properties props = StreamsTestUtils.getStreamsConfig(Serdes.Integer(), Serdes.String());
  
      @Test
      public void testFlatMapValues() {
          final StreamsBuilder builder = new StreamsBuilder();
  
          final int[] expectedKeys = {1, 10, 100, 1000};
  
          final KStream<Integer, String> stream = builder.stream(topicName, Consumed.with(Serdes.Integer(), Serdes.String()));
          stream.mapValues(CharSequence::length).process(supplier);
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              for (final int expectedKey : expectedKeys) {
                  final TestInputTopic<Integer, String> inputTopic =
                          driver.createInputTopic(topicName, new IntegerSerializer(), new StringSerializer());
                  inputTopic.pipeInput(expectedKey, Integer.toString(expectedKey), expectedKey / 2L);
              }
          }
          final KeyValueTimestamp[] expected = {new KeyValueTimestamp<>(1, 1, 0),
              new KeyValueTimestamp<>(10, 2, 5),
              new KeyValueTimestamp<>(100, 3, 50),
              new KeyValueTimestamp<>(1000, 4, 500)};
  
          assertArrayEquals(expected, supplier.theCapturedProcessor().processed().toArray());
      }
  
      @Test
      public void testMapValuesWithKeys() {
          final StreamsBuilder builder = new StreamsBuilder();
  
          final ValueMapperWithKey<Integer, CharSequence, Integer> mapper = (readOnlyKey, value) -> value.length() + readOnlyKey;
  
          final int[] expectedKeys = {1, 10, 100, 1000};
  
          final KStream<Integer, String> stream = builder.stream(topicName, Consumed.with(Serdes.Integer(), Serdes.String()));
          stream.mapValues(mapper).process(supplier);
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<Integer, String> inputTopic =
                      driver.createInputTopic(topicName, new IntegerSerializer(), new StringSerializer());
              for (final int expectedKey : expectedKeys) {
                  inputTopic.pipeInput(expectedKey, Integer.toString(expectedKey), expectedKey / 2L);
              }
          }
          final KeyValueTimestamp[] expected = {new KeyValueTimestamp<>(1, 2, 0),
              new KeyValueTimestamp<>(10, 12, 5),
              new KeyValueTimestamp<>(100, 103, 50),
              new KeyValueTimestamp<>(1000, 1004, 500)};
  
          assertArrayEquals(expected, supplier.theCapturedProcessor().processed().toArray());
      }
  
  }
  