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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.Serdes;
  import org.apache.kafka.common.serialization.StringSerializer;
  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.GlobalKTable;
  import org.apache.kafka.streams.kstream.KStream;
  import org.apache.kafka.streams.kstream.KeyValueMapper;
  import org.apache.kafka.streams.state.ValueAndTimestamp;
  import org.apache.kafka.test.MockApiProcessorSupplier;
  import org.apache.kafka.test.MockValueJoiner;
  import org.apache.kafka.test.StreamsTestUtils;
  
  import org.junit.jupiter.api.BeforeEach;
  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 GlobalKTableJoinsTest {
  
      private final StreamsBuilder builder = new StreamsBuilder();
      private final String streamTopic = "stream";
      private final String globalTopic = "global";
      private GlobalKTable<String, String> global;
      private KStream<String, String> stream;
      private KeyValueMapper<String, String, String> keyValueMapper;
  
      @BeforeEach
      public void setUp() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
          global = builder.globalTable(globalTopic, consumed);
          stream = builder.stream(streamTopic, consumed);
          keyValueMapper = (key, value) -> value;
      }
  
      @Test
      public void shouldLeftJoinWithStream() {
          final MockApiProcessorSupplier<String, String, Void, Void> supplier = new MockApiProcessorSupplier<>();
          stream
              .leftJoin(global, keyValueMapper, MockValueJoiner.TOSTRING_JOINER)
              .process(supplier);
  
          final Map<String, ValueAndTimestamp<String>> expected = new HashMap<>();
          expected.put("1", ValueAndTimestamp.make("a+A", 2L));
          expected.put("2", ValueAndTimestamp.make("b+B", 10L));
          expected.put("3", ValueAndTimestamp.make("c+null", 3L));
  
          verifyJoin(expected, supplier);
      }
  
      @Test
      public void shouldInnerJoinWithStream() {
          final MockApiProcessorSupplier<String, String, Void, Void> supplier = new MockApiProcessorSupplier<>();
          stream
              .join(global, keyValueMapper, MockValueJoiner.TOSTRING_JOINER)
              .process(supplier);
  
          final Map<String, ValueAndTimestamp<String>> expected = new HashMap<>();
          expected.put("1", ValueAndTimestamp.make("a+A", 2L));
          expected.put("2", ValueAndTimestamp.make("b+B", 10L));
  
          verifyJoin(expected, supplier);
      }
  
      private void verifyJoin(final Map<String, ValueAndTimestamp<String>> expected,
                              final MockApiProcessorSupplier<String, String, Void, Void> supplier) {
          final Properties props = StreamsTestUtils.getStreamsConfig(Serdes.String(), Serdes.String());
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> globalInputTopic = driver.createInputTopic(globalTopic, new StringSerializer(), new StringSerializer());
              // write some data to the global table
              globalInputTopic.pipeInput("a", "A", 1L);
              globalInputTopic.pipeInput("b", "B", 5L);
              final TestInputTopic<String, String> streamInputTopic = driver.createInputTopic(streamTopic, new StringSerializer(), new StringSerializer());
              //write some data to the stream
              streamInputTopic.pipeInput("1", "a", 2L);
              streamInputTopic.pipeInput("2", "b", 10L);
              streamInputTopic.pipeInput("3", "c", 3L);
          }
  
          assertEquals(expected, supplier.theCapturedProcessor().lastValueAndTimestampPerKey());
      }
  }
  