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.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.KTable;
  import org.apache.kafka.test.MockApiProcessorSupplier;
  import org.apache.kafka.test.StreamsTestUtils;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Properties;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class KTableMapKeysTest {
      private final Properties props = StreamsTestUtils.getStreamsConfig(Serdes.Integer(), Serdes.String());
  
      @Test
      public void testMapKeysConvertingToStream() {
          final StreamsBuilder builder = new StreamsBuilder();
          final String topic1 = "topic_map_keys";
  
          final KTable<Integer, String> table1 = builder.table(topic1, Consumed.with(Serdes.Integer(), Serdes.String()));
  
          final Map<Integer, String> keyMap = new HashMap<>();
          keyMap.put(1, "ONE");
          keyMap.put(2, "TWO");
          keyMap.put(3, "THREE");
  
          final KStream<String, String> convertedStream = table1.toStream((key, value) -> keyMap.get(key));
  
          final KeyValueTimestamp[] expected = new KeyValueTimestamp[] {new KeyValueTimestamp<>("ONE", "V_ONE", 5),
              new KeyValueTimestamp<>("TWO", "V_TWO", 10),
              new KeyValueTimestamp<>("THREE", "V_THREE", 15)};
          final int[] originalKeys = new int[] {1, 2, 3};
          final String[] values = new String[] {"V_ONE", "V_TWO", "V_THREE"};
  
          final MockApiProcessorSupplier<String, String, Void, Void> supplier = new MockApiProcessorSupplier<>();
          convertedStream.process(supplier);
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              for (int i = 0; i < originalKeys.length; i++) {
                  final TestInputTopic<Integer, String> inputTopic =
                          driver.createInputTopic(topic1, new IntegerSerializer(), new StringSerializer());
                  inputTopic.pipeInput(originalKeys[i], values[i], 5 + i * 5);
              }
          }
  
          assertEquals(3, supplier.theCapturedProcessor().processed().size());
          for (int i = 0; i < expected.length; i++) {
              assertEquals(expected[i], supplier.theCapturedProcessor().processed().get(i));
          }
      }
  }