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.IntegerDeserializer;
  import org.apache.kafka.common.serialization.LongDeserializer;
  import org.apache.kafka.common.serialization.Serde;
  import org.apache.kafka.common.serialization.Serdes;
  import org.apache.kafka.common.serialization.StringDeserializer;
  import org.apache.kafka.common.serialization.StringSerializer;
  import org.apache.kafka.common.utils.Bytes;
  import org.apache.kafka.streams.KeyValue;
  import org.apache.kafka.streams.KeyValueTimestamp;
  import org.apache.kafka.streams.StreamsBuilder;
  import org.apache.kafka.streams.TestInputTopic;
  import org.apache.kafka.streams.TestOutputTopic;
  import org.apache.kafka.streams.Topology;
  import org.apache.kafka.streams.TopologyTestDriver;
  import org.apache.kafka.streams.TopologyWrapper;
  import org.apache.kafka.streams.kstream.Consumed;
  import org.apache.kafka.streams.kstream.GlobalKTable;
  import org.apache.kafka.streams.kstream.Grouped;
  import org.apache.kafka.streams.kstream.JoinWindows;
  import org.apache.kafka.streams.kstream.Joined;
  import org.apache.kafka.streams.kstream.KStream;
  import org.apache.kafka.streams.kstream.KTable;
  import org.apache.kafka.streams.kstream.KeyValueMapper;
  import org.apache.kafka.streams.kstream.Materialized;
  import org.apache.kafka.streams.kstream.Named;
  import org.apache.kafka.streams.kstream.Produced;
  import org.apache.kafka.streams.kstream.Repartitioned;
  import org.apache.kafka.streams.kstream.StreamJoined;
  import org.apache.kafka.streams.kstream.ValueJoiner;
  import org.apache.kafka.streams.kstream.ValueJoinerWithKey;
  import org.apache.kafka.streams.kstream.ValueMapper;
  import org.apache.kafka.streams.kstream.ValueMapperWithKey;
  import org.apache.kafka.streams.processor.FailOnInvalidTimestamp;
  import org.apache.kafka.streams.processor.TopicNameExtractor;
  import org.apache.kafka.streams.processor.api.ContextualFixedKeyProcessor;
  import org.apache.kafka.streams.processor.api.FixedKeyProcessorSupplier;
  import org.apache.kafka.streams.processor.api.FixedKeyRecord;
  import org.apache.kafka.streams.processor.api.Processor;
  import org.apache.kafka.streams.processor.api.ProcessorContext;
  import org.apache.kafka.streams.processor.api.ProcessorSupplier;
  import org.apache.kafka.streams.processor.api.Record;
  import org.apache.kafka.streams.processor.internals.ProcessorTopology;
  import org.apache.kafka.streams.processor.internals.SourceNode;
  import org.apache.kafka.streams.state.KeyValueIterator;
  import org.apache.kafka.streams.state.KeyValueStore;
  import org.apache.kafka.streams.state.StoreBuilder;
  import org.apache.kafka.streams.state.Stores;
  import org.apache.kafka.streams.test.TestRecord;
  import org.apache.kafka.test.MockApiFixedKeyProcessorSupplier;
  import org.apache.kafka.test.MockApiProcessor;
  import org.apache.kafka.test.MockApiProcessorSupplier;
  import org.apache.kafka.test.MockMapper;
  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.time.Duration;
  import java.time.Instant;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Set;
  import java.util.concurrent.TimeUnit;
  import java.util.function.Function;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import static java.time.Duration.ofMillis;
  import static java.util.Arrays.asList;
  import static java.util.Collections.emptyMap;
  import static org.apache.kafka.common.utils.Utils.mkEntry;
  import static org.apache.kafka.common.utils.Utils.mkMap;
  import static org.hamcrest.CoreMatchers.containsString;
  import static org.hamcrest.CoreMatchers.equalTo;
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.core.IsInstanceOf.instanceOf;
  import static org.hamcrest.core.IsNull.notNullValue;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class KStreamImplTest {
  
      private final Consumed<String, String> stringConsumed = Consumed.with(Serdes.String(), Serdes.String());
      private final MockApiProcessorSupplier<String, String, Void, Void> processorSupplier = new MockApiProcessorSupplier<>();
      private final MockApiFixedKeyProcessorSupplier<String, String, Void> fixedKeyProcessorSupplier = new MockApiFixedKeyProcessorSupplier<>();
  
      private StreamsBuilder builder;
      private KStream<String, String> testStream;
      private KTable<String, String> testTable;
      private GlobalKTable<String, String> testGlobalTable;
  
      private final Properties props = StreamsTestUtils.getStreamsConfig(Serdes.String(), Serdes.String());
  
      private final Serde<String> mySerde = new Serdes.StringSerde();
  
      @BeforeEach
      public void before() {
          builder = new StreamsBuilder();
          testStream = builder.stream("source");
          testTable = builder.table("topic");
          testGlobalTable = builder.globalTable("global");
      }
  
      @Test
      public void shouldNotAllowNullPredicateOnFilter() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.filter(null));
          assertThat(exception.getMessage(), equalTo("predicate cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullPredicateOnFilterWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.filter(null, Named.as("filter")));
          assertThat(exception.getMessage(), equalTo("predicate cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnFilter() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.filter((k, v) -> true, null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullPredicateOnFilterNot() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.filterNot(null));
          assertThat(exception.getMessage(), equalTo("predicate cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullPredicateOnFilterNotWithName() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.filterNot(null, Named.as("filter")));
          assertThat(exception.getMessage(), equalTo("predicate cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnFilterNot() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.filterNot((k, v) -> true, null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnSelectKey() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.selectKey(null));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnSelectKeyWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.selectKey(null, Named.as("keySelector")));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnSelectKey() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.selectKey((k, v) -> k, null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnMap() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.map(null));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnMapWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.map(null, Named.as("map")));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnMap() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.map(KeyValue::pair, null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnMapValues() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.mapValues((ValueMapper<Object, Object>) null));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnMapValuesWithKey() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.mapValues((ValueMapperWithKey<Object, Object, Object>) null));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnMapValuesWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.mapValues((ValueMapper<Object, Object>) null, Named.as("valueMapper")));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnMapValuesWithKeyWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.mapValues(
                  (ValueMapperWithKey<Object, Object, Object>) null,
                  Named.as("valueMapperWithKey")));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnMapValues() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.mapValues(v -> v, null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnMapValuesWithKey() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.mapValues((k, v) -> v, null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnFlatMap() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.flatMap(null));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnFlatMapWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.flatMap(null, Named.as("flatMapper")));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnFlatMap() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.flatMap((k, v) -> Collections.singleton(new KeyValue<>(k, v)), null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnFlatMapValues() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.flatMapValues((ValueMapper<Object, Iterable<Object>>) null));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnFlatMapValuesWithKey() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.flatMapValues((ValueMapperWithKey<Object, Object, ? extends Iterable<Object>>) null));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnFlatMapValuesWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.flatMapValues(
                  (ValueMapper<Object, Iterable<Object>>) null,
                  Named.as("flatValueMapper")));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnFlatMapValuesWithKeyWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.flatMapValues(
                  (ValueMapperWithKey<Object, Object, ? extends Iterable<Object>>) null,
                  Named.as("flatValueMapperWithKey")));
          assertThat(exception.getMessage(), equalTo("mapper cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNameOnFlatMapValues() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.flatMapValues(v -> Collections.emptyList(), null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNameOnFlatMapValuesWithKey() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.flatMapValues((k, v) -> Collections.emptyList(), null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullPrintedOnPrint() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.print(null));
          assertThat(exception.getMessage(), equalTo("printed cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullActionOnForEach() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.foreach(null));
          assertThat(exception.getMessage(), equalTo("action cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullActionOnForEachWithName() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.foreach(null, Named.as("foreach")));
          assertThat(exception.getMessage(), equalTo("action cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnForEach() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.foreach((k, v) -> { }, null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullActionOnPeek() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.peek(null));
          assertThat(exception.getMessage(), equalTo("action cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullActionOnPeekWithName() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.peek(null, Named.as("peek")));
          assertThat(exception.getMessage(), equalTo("action cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnPeek() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.peek((k, v) -> { }, null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullKStreamOnMerge() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.merge(null));
          assertThat(exception.getMessage(), equalTo("otherStream cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullKStreamOnMergeWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.merge(null, Named.as("merge")));
          assertThat(exception.getMessage(), equalTo("otherStream cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnMerge() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.merge(testStream, null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTopicOnTo() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.to((String) null));
          assertThat(exception.getMessage(), equalTo("topic cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullRepartitionedOnRepartition() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.repartition(null));
          assertThat(exception.getMessage(), equalTo("repartitioned cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTopicChooserOnTo() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.to((TopicNameExtractor<String, String>) null));
          assertThat(exception.getMessage(), equalTo("topicExtractor cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTopicOnToWithProduced() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.to((String) null, Produced.as("to")));
          assertThat(exception.getMessage(), equalTo("topic cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTopicChooserOnToWithProduced() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.to((TopicNameExtractor<String, String>) null, Produced.as("to")));
          assertThat(exception.getMessage(), equalTo("topicExtractor cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullProducedOnToWithTopicName() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.to("topic", null));
          assertThat(exception.getMessage(), equalTo("produced cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullProducedOnToWithTopicChooser() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.to((k, v, ctx) -> "topic", null));
          assertThat(exception.getMessage(), equalTo("produced cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullSelectorOnGroupBy() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.groupBy(null));
          assertThat(exception.getMessage(), equalTo("keySelector cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullSelectorOnGroupByWithGrouped() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.groupBy(null, Grouped.as("name")));
          assertThat(exception.getMessage(), equalTo("keySelector cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullGroupedOnGroupBy() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.groupBy((k, v) -> k, null));
          assertThat(exception.getMessage(), equalTo("grouped cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullGroupedOnGroupByKey() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.groupByKey(null));
          assertThat(exception.getMessage(), equalTo("grouped cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnToTable() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.toTable((Named) null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMaterializedOnToTable() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.toTable((Materialized<String, String, KeyValueStore<Bytes, byte[]>>) null));
          assertThat(exception.getMessage(), equalTo("materialized cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnToTableWithMaterialized() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.toTable(null, Materialized.with(null, null)));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMaterializedOnToTableWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.toTable(Named.as("name"), null));
          assertThat(exception.getMessage(), equalTo("materialized cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullOtherStreamOnJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(null, MockValueJoiner.TOSTRING_JOINER, JoinWindows.of(ofMillis(10))));
          assertThat(exception.getMessage(), equalTo("otherStream cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullOtherStreamOnJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(
                  null,
                  MockValueJoiner.TOSTRING_JOINER,
                  JoinWindows.of(ofMillis(10)),
                  StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("otherStream cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerOnJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testStream, (ValueJoiner<? super String, ? super String, ?>) null, JoinWindows.of(ofMillis(10))));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testStream, (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null, JoinWindows.of(ofMillis(10))));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerOnJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(
                    testStream,
                    (ValueJoiner<? super String, ? super String, ?>) null,
                    JoinWindows.of(ofMillis(10)),
                    StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(
                      testStream,
                      (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null,
                      JoinWindows.of(ofMillis(10)),
                      StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullJoinWindowsOnJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testStream, MockValueJoiner.TOSTRING_JOINER, null));
          assertThat(exception.getMessage(), equalTo("windows cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullJoinWindowsOnJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(
                  testStream,
                  MockValueJoiner.TOSTRING_JOINER,
                  null,
                  StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("windows cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullStreamJoinedOnJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(
                  testStream,
                  MockValueJoiner.TOSTRING_JOINER,
                  JoinWindows.of(ofMillis(10)),
                  null));
          assertThat(exception.getMessage(), equalTo("streamJoined cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullOtherStreamOnLeftJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(null, MockValueJoiner.TOSTRING_JOINER, JoinWindows.of(ofMillis(10))));
          assertThat(exception.getMessage(), equalTo("otherStream cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullOtherStreamOnLeftJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(
                  null,
                  MockValueJoiner.TOSTRING_JOINER,
                  JoinWindows.of(ofMillis(10)),
                  StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("otherStream cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerOnLeftJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testStream, (ValueJoiner<? super String, ? super String, ?>) null, JoinWindows.of(ofMillis(10))));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnLeftJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testStream, (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null, JoinWindows.of(ofMillis(10))));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerOnLeftJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(
                  testStream,
                  (ValueJoiner<? super String, ? super String, ?>) null,
                  JoinWindows.of(ofMillis(10)),
                  StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnLeftJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(
                  testStream,
                      (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null,
                      JoinWindows.of(ofMillis(10)),
                      StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
  
      @Test
      public void shouldNotAllowNullJoinWindowsOnLeftJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testStream, MockValueJoiner.TOSTRING_JOINER, null));
          assertThat(exception.getMessage(), equalTo("windows cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullJoinWindowsOnLeftJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(
                  testStream,
                  MockValueJoiner.TOSTRING_JOINER,
                  null,
                  StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("windows cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullStreamJoinedOnLeftJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(
                  testStream,
                  MockValueJoiner.TOSTRING_JOINER,
                  JoinWindows.of(ofMillis(10)),
                  null));
          assertThat(exception.getMessage(), equalTo("streamJoined cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullOtherStreamOnOuterJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.outerJoin(null, MockValueJoiner.TOSTRING_JOINER, JoinWindows.of(ofMillis(10))));
          assertThat(exception.getMessage(), equalTo("otherStream cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullOtherStreamOnOuterJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.outerJoin(
                  null,
                  MockValueJoiner.TOSTRING_JOINER,
                  JoinWindows.of(ofMillis(10)),
                  StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("otherStream cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerOnOuterJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.outerJoin(testStream, (ValueJoiner<? super String, ? super String, ?>) null, JoinWindows.of(ofMillis(10))));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnOuterJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.outerJoin(testStream, (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null, JoinWindows.of(ofMillis(10))));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerOnOuterJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.outerJoin(
                  testStream,
                  (ValueJoiner<? super String, ? super String, ?>) null,
                  JoinWindows.of(ofMillis(10)),
                  StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnOuterJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.outerJoin(
                      testStream,
                      (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null,
                      JoinWindows.of(ofMillis(10)),
                      StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullJoinWindowsOnOuterJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.outerJoin(testStream, MockValueJoiner.TOSTRING_JOINER, null));
          assertThat(exception.getMessage(), equalTo("windows cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullJoinWindowsOnOuterJoinWithStreamJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.outerJoin(
                  testStream,
                  MockValueJoiner.TOSTRING_JOINER,
                  null,
                  StreamJoined.as("name")));
          assertThat(exception.getMessage(), equalTo("windows cannot be null"));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldNotAllowNullStreamJoinedOnOuterJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.outerJoin(
                  testStream,
                  MockValueJoiner.TOSTRING_JOINER,
                  JoinWindows.of(ofMillis(10)),
                  null));
          assertThat(exception.getMessage(), equalTo("streamJoined cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTableOnTableJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(null, MockValueJoiner.TOSTRING_JOINER));
          assertThat(exception.getMessage(), equalTo("table cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTableOnTableJoinWithJoiner() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(null, MockValueJoiner.TOSTRING_JOINER, Joined.as("name")));
          assertThat(exception.getMessage(), equalTo("table cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerOnTableJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testTable, (ValueJoiner<? super String, ? super String, ?>) null));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnTableJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testTable, (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerOnTableJoinWithJoiner() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testTable, (ValueJoiner<? super String, ? super String, ?>) null, Joined.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnTableJoinWithJoiner() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testTable, (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null, Joined.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullJoinedOnTableJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testTable, MockValueJoiner.TOSTRING_JOINER, null));
          assertThat(exception.getMessage(), equalTo("joined cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTableOnTableLeftJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(null, MockValueJoiner.TOSTRING_JOINER));
          assertThat(exception.getMessage(), equalTo("table cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTableOnTableLeftJoinWithJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(null, MockValueJoiner.TOSTRING_JOINER, Joined.as("name")));
          assertThat(exception.getMessage(), equalTo("table cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerOnTableLeftJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testTable, (ValueJoiner<? super String, ? super String, ?>) null));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnTableLeftJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testTable, (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerOnTableLeftJoinWithJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testTable, (ValueJoiner<? super String, ? super String, ?>) null, Joined.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnTableLeftJoinWithJoined() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testTable, (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null, Joined.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullJoinedOnTableLeftJoin() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testTable, MockValueJoiner.TOSTRING_JOINER, null));
          assertThat(exception.getMessage(), equalTo("joined cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTableOnJoinWithGlobalTable() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(null, MockMapper.selectValueMapper(), MockValueJoiner.TOSTRING_JOINER));
          assertThat(exception.getMessage(), equalTo("globalTable cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTableOnJoinWithGlobalTableWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(
                  null,
                  MockMapper.selectValueMapper(),
                  MockValueJoiner.TOSTRING_JOINER,
                  Named.as("name")));
          assertThat(exception.getMessage(), equalTo("globalTable cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnJoinWithGlobalTable() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testGlobalTable, null, MockValueJoiner.TOSTRING_JOINER));
          assertThat(exception.getMessage(), equalTo("keySelector cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnJoinWithGlobalTableWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(
                  testGlobalTable,
                  null,
                  MockValueJoiner.TOSTRING_JOINER,
                  Named.as("name")));
          assertThat(exception.getMessage(), equalTo("keySelector cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerOnJoinWithGlobalTable() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testGlobalTable, MockMapper.selectValueMapper(), (ValueJoiner<? super String, ? super String, ?>) null));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnJoinWithGlobalTable() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(testGlobalTable, MockMapper.selectValueMapper(), (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerOnJoinWithGlobalTableWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(
                  testGlobalTable,
                  MockMapper.selectValueMapper(),
                  (ValueJoiner<? super String, ? super String, ?>) null,
                  Named.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnJoinWithGlobalTableWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.join(
                      testGlobalTable,
                      MockMapper.selectValueMapper(),
                      (ValueJoiner<? super String, ? super String, ?>) null,
                      Named.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTableOnLeftJoinWithGlobalTable() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(null, MockMapper.selectValueMapper(), MockValueJoiner.TOSTRING_JOINER));
          assertThat(exception.getMessage(), equalTo("globalTable cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullTableOnLeftJoinWithGlobalTableWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(
                  null,
                  MockMapper.selectValueMapper(),
                  MockValueJoiner.TOSTRING_JOINER,
                  Named.as("name")));
          assertThat(exception.getMessage(), equalTo("globalTable cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnLeftJoinWithGlobalTable() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testGlobalTable, null, MockValueJoiner.TOSTRING_JOINER));
          assertThat(exception.getMessage(), equalTo("keySelector cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullMapperOnLeftJoinWithGlobalTableWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(
                  testGlobalTable,
                  null,
                  MockValueJoiner.TOSTRING_JOINER,
                  Named.as("name")));
          assertThat(exception.getMessage(), equalTo("keySelector cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerOnLeftJoinWithGlobalTable() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testGlobalTable, MockMapper.selectValueMapper(), (ValueJoiner<? super String, ? super String, ?>) null));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnLeftJoinWithGlobalTable() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(testGlobalTable, MockMapper.selectValueMapper(), (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerOnLeftJoinWithGlobalTableWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(
                  testGlobalTable,
                  MockMapper.selectValueMapper(),
                  (ValueJoiner<? super String, ? super String, ?>) null,
                  Named.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullValueJoinerWithKeyOnLeftJoinWithGlobalTableWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.leftJoin(
                      testGlobalTable,
                      MockMapper.selectValueMapper(),
                      (ValueJoinerWithKey<? super String, ? super String, ? super String, ?>) null,
                      Named.as("name")));
          assertThat(exception.getMessage(), equalTo("joiner cannot be null"));
      }
  
      @SuppressWarnings({"rawtypes", "deprecation"})  // specifically testing the deprecated variant
      @Test
      public void shouldPreserveSerdesForOperators() {
          final StreamsBuilder builder = new StreamsBuilder();
          final KStream<String, String> stream1 = builder.stream(Collections.singleton("topic-1"), stringConsumed);
          final KTable<String, String> table1 = builder.table("topic-2", stringConsumed);
          final GlobalKTable<String, String> table2 = builder.globalTable("topic-2", stringConsumed);
          final ConsumedInternal<String, String> consumedInternal = new ConsumedInternal<>(stringConsumed);
  
          final KeyValueMapper<String, String, String> selector = (key, value) -> key;
          final KeyValueMapper<String, String, Iterable<KeyValue<String, String>>> flatSelector = (key, value) -> Collections.singleton(new KeyValue<>(key, value));
          final ValueMapper<String, String> mapper = value -> value;
          final ValueMapper<String, Iterable<String>> flatMapper = Collections::singleton;
          final ValueJoiner<String, String, String> joiner = (value1, value2) -> value1;
  
          assertEquals(((AbstractStream) stream1.filter((key, value) -> false)).keySerde(), consumedInternal.keySerde());
          assertEquals(((AbstractStream) stream1.filter((key, value) -> false)).valueSerde(), consumedInternal.valueSerde());
  
          assertEquals(((AbstractStream) stream1.filterNot((key, value) -> false)).keySerde(), consumedInternal.keySerde());
          assertEquals(((AbstractStream) stream1.filterNot((key, value) -> false)).valueSerde(), consumedInternal.valueSerde());
  
          assertNull(((AbstractStream) stream1.selectKey(selector)).keySerde());
          assertEquals(((AbstractStream) stream1.selectKey(selector)).valueSerde(), consumedInternal.valueSerde());
  
          assertNull(((AbstractStream) stream1.map(KeyValue::new)).keySerde());
          assertNull(((AbstractStream) stream1.map(KeyValue::new)).valueSerde());
  
          assertEquals(((AbstractStream) stream1.mapValues(mapper)).keySerde(), consumedInternal.keySerde());
          assertNull(((AbstractStream) stream1.mapValues(mapper)).valueSerde());
  
          assertNull(((AbstractStream) stream1.flatMap(flatSelector)).keySerde());
          assertNull(((AbstractStream) stream1.flatMap(flatSelector)).valueSerde());
  
          assertEquals(((AbstractStream) stream1.flatMapValues(flatMapper)).keySerde(), consumedInternal.keySerde());
          assertNull(((AbstractStream) stream1.flatMapValues(flatMapper)).valueSerde());
  
          assertNull(((AbstractStream) stream1.merge(stream1)).keySerde());
          assertNull(((AbstractStream) stream1.merge(stream1)).valueSerde());
  
  
          assertEquals(((AbstractStream) stream1.repartition()).keySerde(), consumedInternal.keySerde());
          assertEquals(((AbstractStream) stream1.repartition()).valueSerde(), consumedInternal.valueSerde());
          assertEquals(((AbstractStream) stream1.repartition(Repartitioned.with(mySerde, mySerde))).keySerde(), mySerde);
          assertEquals(((AbstractStream) stream1.repartition(Repartitioned.with(mySerde, mySerde))).valueSerde(), mySerde);
  
          assertEquals(((AbstractStream) stream1.groupByKey()).keySerde(), consumedInternal.keySerde());
          assertEquals(((AbstractStream) stream1.groupByKey()).valueSerde(), consumedInternal.valueSerde());
          assertEquals(((AbstractStream) stream1.groupByKey(Grouped.with(mySerde, mySerde))).keySerde(), mySerde);
          assertEquals(((AbstractStream) stream1.groupByKey(Grouped.with(mySerde, mySerde))).valueSerde(), mySerde);
  
          assertNull(((AbstractStream) stream1.groupBy(selector)).keySerde());
          assertEquals(((AbstractStream) stream1.groupBy(selector)).valueSerde(), consumedInternal.valueSerde());
          assertEquals(((AbstractStream) stream1.groupBy(selector, Grouped.with(mySerde, mySerde))).keySerde(), mySerde);
          assertEquals(((AbstractStream) stream1.groupBy(selector, Grouped.with(mySerde, mySerde))).valueSerde(), mySerde);
  
          assertNull(((AbstractStream) stream1.join(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)))).keySerde());
          assertNull(((AbstractStream) stream1.join(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)))).valueSerde());
          assertEquals(((AbstractStream) stream1.join(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)), StreamJoined.with(mySerde, mySerde, mySerde))).keySerde(), mySerde);
          assertNull(((AbstractStream) stream1.join(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)), StreamJoined.with(mySerde, mySerde, mySerde))).valueSerde());
  
          assertNull(((AbstractStream) stream1.leftJoin(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)))).keySerde());
          assertNull(((AbstractStream) stream1.leftJoin(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)))).valueSerde());
          assertEquals(((AbstractStream) stream1.leftJoin(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)), StreamJoined.with(mySerde, mySerde, mySerde))).keySerde(), mySerde);
          assertNull(((AbstractStream) stream1.leftJoin(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)), StreamJoined.with(mySerde, mySerde, mySerde))).valueSerde());
  
          assertNull(((AbstractStream) stream1.outerJoin(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)))).keySerde());
          assertNull(((AbstractStream) stream1.outerJoin(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)))).valueSerde());
          assertEquals(((AbstractStream) stream1.outerJoin(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)), StreamJoined.with(mySerde, mySerde, mySerde))).keySerde(), mySerde);
          assertNull(((AbstractStream) stream1.outerJoin(stream1, joiner, JoinWindows.of(Duration.ofMillis(100L)), StreamJoined.with(mySerde, mySerde, mySerde))).valueSerde());
  
          assertEquals(((AbstractStream) stream1.join(table1, joiner)).keySerde(), consumedInternal.keySerde());
          assertNull(((AbstractStream) stream1.join(table1, joiner)).valueSerde());
          assertEquals(((AbstractStream) stream1.join(table1, joiner, Joined.with(mySerde, mySerde, mySerde))).keySerde(), mySerde);
          assertNull(((AbstractStream) stream1.join(table1, joiner, Joined.with(mySerde, mySerde, mySerde))).valueSerde());
  
          assertEquals(((AbstractStream) stream1.leftJoin(table1, joiner)).keySerde(), consumedInternal.keySerde());
          assertNull(((AbstractStream) stream1.leftJoin(table1, joiner)).valueSerde());
          assertEquals(((AbstractStream) stream1.leftJoin(table1, joiner, Joined.with(mySerde, mySerde, mySerde))).keySerde(), mySerde);
          assertNull(((AbstractStream) stream1.leftJoin(table1, joiner, Joined.with(mySerde, mySerde, mySerde))).valueSerde());
  
          assertEquals(((AbstractStream) stream1.join(table2, selector, joiner)).keySerde(), consumedInternal.keySerde());
          assertNull(((AbstractStream) stream1.join(table2, selector, joiner)).valueSerde());
  
          assertEquals(((AbstractStream) stream1.leftJoin(table2, selector, joiner)).keySerde(), consumedInternal.keySerde());
          assertNull(((AbstractStream) stream1.leftJoin(table2, selector, joiner)).valueSerde());
      }
  
      @Test
      public void shouldUseRecordMetadataTimestampExtractorWithRepartition() {
          final StreamsBuilder builder = new StreamsBuilder();
          final KStream<String, String> stream1 = builder.stream(Arrays.asList("topic-1", "topic-2"), stringConsumed);
          final KStream<String, String> stream2 = builder.stream(Arrays.asList("topic-3", "topic-4"), stringConsumed);
  
          stream1.to("topic-5");
          stream2.repartition(Repartitioned.as("topic-6"));
  
          final ProcessorTopology processorTopology = TopologyWrapper.getInternalTopologyBuilder(builder.build()).setApplicationId("X").buildTopology();
          assertThat(processorTopology.source("X-topic-6-repartition").timestampExtractor(), instanceOf(FailOnInvalidTimestamp.class));
          assertNull(processorTopology.source("topic-4").timestampExtractor());
          assertNull(processorTopology.source("topic-3").timestampExtractor());
          assertNull(processorTopology.source("topic-2").timestampExtractor());
          assertNull(processorTopology.source("topic-1").timestampExtractor());
      }
  
      @Test
      public void shouldSendDataThroughRepartitionTopicUsingRepartitioned() {
          final StreamsBuilder builder = new StreamsBuilder();
          final String input = "topic";
          final KStream<String, String> stream = builder.stream(input, stringConsumed);
          stream.repartition(Repartitioned.with(Serdes.String(), Serdes.String())).process(processorSupplier);
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(input, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              inputTopic.pipeInput("a", "b");
          }
          assertThat(processorSupplier.theCapturedProcessor().processed(), equalTo(Collections.singletonList(new KeyValueTimestamp<>("a", "b", 0))));
      }
  
      @Test
      public void shouldSendDataToTopicUsingProduced() {
          final StreamsBuilder builder = new StreamsBuilder();
          final String input = "topic";
          final KStream<String, String> stream = builder.stream(input, stringConsumed);
          stream.to("to-topic", Produced.with(Serdes.String(), Serdes.String()));
          builder.stream("to-topic", stringConsumed).process(processorSupplier);
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(input, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              inputTopic.pipeInput("e", "f");
          }
          assertThat(processorSupplier.theCapturedProcessor().processed(), equalTo(Collections.singletonList(new KeyValueTimestamp<>("e", "f", 0))));
      }
  
      @Test
      public void shouldSendDataToDynamicTopics() {
          final StreamsBuilder builder = new StreamsBuilder();
          final String input = "topic";
          final KStream<String, String> stream = builder.stream(input, stringConsumed);
          stream.to((key, value, context) -> context.topic() + "-" + key + "-" + value.charAt(0),
              Produced.with(Serdes.String(), Serdes.String()));
          builder.stream(input + "-a-v", stringConsumed).process(processorSupplier);
          builder.stream(input + "-b-v", stringConsumed).process(processorSupplier);
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(input, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              inputTopic.pipeInput("a", "v1");
              inputTopic.pipeInput("a", "v2");
              inputTopic.pipeInput("b", "v1");
          }
          final List<MockApiProcessor<String, String, Void, Void>> mockProcessors = processorSupplier.capturedProcessors(2);
          assertThat(mockProcessors.get(0).processed(), equalTo(asList(new KeyValueTimestamp<>("a", "v1", 0),
              new KeyValueTimestamp<>("a", "v2", 0))));
          assertThat(mockProcessors.get(1).processed(), equalTo(Collections.singletonList(new KeyValueTimestamp<>("b", "v1", 0))));
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldUseRecordMetadataTimestampExtractorWhenInternalRepartitioningTopicCreatedWithRetention() {
          final StreamsBuilder builder = new StreamsBuilder();
          final KStream<String, String> kStream = builder.stream("topic-1", stringConsumed);
          final ValueJoiner<String, String, String> valueJoiner = MockValueJoiner.instance(":");
          final long windowSize = TimeUnit.MILLISECONDS.convert(1, TimeUnit.DAYS);
          final KStream<String, String> stream = kStream
              .map((key, value) -> KeyValue.pair(value, value));
          stream.join(kStream,
              valueJoiner,
              JoinWindows.of(ofMillis(windowSize)).grace(ofMillis(3 * windowSize)),
              StreamJoined.with(Serdes.String(), Serdes.String(), Serdes.String()))
              .to("output-topic", Produced.with(Serdes.String(), Serdes.String()));
  
          final ProcessorTopology topology = TopologyWrapper.getInternalTopologyBuilder(builder.build()).setApplicationId("X").buildTopology();
  
          final SourceNode<?, ?> originalSourceNode = topology.source("topic-1");
  
          for (final SourceNode<?, ?> sourceNode : topology.sources()) {
              if (sourceNode.name().equals(originalSourceNode.name())) {
                  assertNull(sourceNode.timestampExtractor());
              } else {
                  assertThat(sourceNode.timestampExtractor(), instanceOf(FailOnInvalidTimestamp.class));
              }
          }
      }
  
      @SuppressWarnings("deprecation")
      @Test
      public void shouldUseRecordMetadataTimestampExtractorWhenInternalRepartitioningTopicCreated() {
          final StreamsBuilder builder = new StreamsBuilder();
          final KStream<String, String> kStream = builder.stream("topic-1", stringConsumed);
          final ValueJoiner<String, String, String> valueJoiner = MockValueJoiner.instance(":");
          final long windowSize = TimeUnit.MILLISECONDS.convert(1, TimeUnit.DAYS);
          final KStream<String, String> stream = kStream
              .map((key, value) -> KeyValue.pair(value, value));
          stream.join(
              kStream,
              valueJoiner,
              JoinWindows.of(ofMillis(windowSize)).grace(ofMillis(3L * windowSize)),
              StreamJoined.with(Serdes.String(), Serdes.String(), Serdes.String())
          )
              .to("output-topic", Produced.with(Serdes.String(), Serdes.String()));
  
          final ProcessorTopology topology = TopologyWrapper.getInternalTopologyBuilder(builder.build()).setApplicationId("X").buildTopology();
  
          final SourceNode<?, ?> originalSourceNode = topology.source("topic-1");
  
          for (final SourceNode<?, ?> sourceNode : topology.sources()) {
              if (sourceNode.name().equals(originalSourceNode.name())) {
                  assertNull(sourceNode.timestampExtractor());
              } else {
                  assertThat(sourceNode.timestampExtractor(), instanceOf(FailOnInvalidTimestamp.class));
              }
          }
      }
  
      @Test
      public void shouldPropagateRepartitionFlagAfterGlobalKTableJoin() {
          final StreamsBuilder builder = new StreamsBuilder();
          final GlobalKTable<String, String> globalKTable = builder.globalTable("globalTopic");
          final KeyValueMapper<String, String, String> kvMappper = (k, v) -> k + v;
          final ValueJoiner<String, String, String> valueJoiner = (v1, v2) -> v1 + v2;
          builder.<String, String>stream("topic").selectKey((k, v) -> v)
              .join(globalKTable, kvMappper, valueJoiner)
              .groupByKey()
              .count();
  
          final Pattern repartitionTopicPattern = Pattern.compile("Sink: .*-repartition");
          final String topology = builder.build().describe().toString();
          final Matcher matcher = repartitionTopicPattern.matcher(topology);
          assertTrue(matcher.find());
          final String match = matcher.group();
          assertThat(match, notNullValue());
          assertTrue(match.endsWith("repartition"));
      }
  
      @Test
      public void shouldMergeTwoStreams() {
          final String topic1 = "topic-1";
          final String topic2 = "topic-2";
  
          final KStream<String, String> source1 = builder.stream(topic1);
          final KStream<String, String> source2 = builder.stream(topic2);
          final KStream<String, String> merged = source1.merge(source2);
  
          merged.process(processorSupplier);
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic1 =
                  driver.createInputTopic(topic1, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopic2 =
                  driver.createInputTopic(topic2, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              inputTopic1.pipeInput("A", "aa");
              inputTopic2.pipeInput("B", "bb");
              inputTopic2.pipeInput("C", "cc");
              inputTopic1.pipeInput("D", "dd");
          }
  
          assertEquals(asList(new KeyValueTimestamp<>("A", "aa", 0),
              new KeyValueTimestamp<>("B", "bb", 0),
              new KeyValueTimestamp<>("C", "cc", 0),
              new KeyValueTimestamp<>("D", "dd", 0)), processorSupplier.theCapturedProcessor().processed());
      }
  
      @Test
      public void shouldMergeMultipleStreams() {
          final String topic1 = "topic-1";
          final String topic2 = "topic-2";
          final String topic3 = "topic-3";
          final String topic4 = "topic-4";
  
          final KStream<String, String> source1 = builder.stream(topic1);
          final KStream<String, String> source2 = builder.stream(topic2);
          final KStream<String, String> source3 = builder.stream(topic3);
          final KStream<String, String> source4 = builder.stream(topic4);
          final KStream<String, String> merged = source1.merge(source2).merge(source3).merge(source4);
  
          merged.process(processorSupplier);
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic1 =
                  driver.createInputTopic(topic1, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopic2 =
                  driver.createInputTopic(topic2, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopic3 =
                  driver.createInputTopic(topic3, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopic4 =
                  driver.createInputTopic(topic4, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
  
              inputTopic1.pipeInput("A", "aa", 1L);
              inputTopic2.pipeInput("B", "bb", 9L);
              inputTopic3.pipeInput("C", "cc", 2L);
              inputTopic4.pipeInput("D", "dd", 8L);
              inputTopic4.pipeInput("E", "ee", 3L);
              inputTopic3.pipeInput("F", "ff", 7L);
              inputTopic2.pipeInput("G", "gg", 4L);
              inputTopic1.pipeInput("H", "hh", 6L);
          }
  
          assertEquals(asList(new KeyValueTimestamp<>("A", "aa", 1),
              new KeyValueTimestamp<>("B", "bb", 9),
              new KeyValueTimestamp<>("C", "cc", 2),
              new KeyValueTimestamp<>("D", "dd", 8),
              new KeyValueTimestamp<>("E", "ee", 3),
              new KeyValueTimestamp<>("F", "ff", 7),
              new KeyValueTimestamp<>("G", "gg", 4),
              new KeyValueTimestamp<>("H", "hh", 6)),
              processorSupplier.theCapturedProcessor().processed());
      }
  
      @Test
      public void shouldProcessFromSourceThatMatchPattern() {
          final KStream<String, String> pattern2Source = builder.stream(Pattern.compile("topic-\\d"));
  
          pattern2Source.process(processorSupplier);
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic3 =
                  driver.createInputTopic("topic-3", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopic4 =
                  driver.createInputTopic("topic-4", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopic5 =
                  driver.createInputTopic("topic-5", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopic6 =
                  driver.createInputTopic("topic-6", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopic7 =
                  driver.createInputTopic("topic-7", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
  
              inputTopic3.pipeInput("A", "aa", 1L);
              inputTopic4.pipeInput("B", "bb", 5L);
              inputTopic5.pipeInput("C", "cc", 10L);
              inputTopic6.pipeInput("D", "dd", 8L);
              inputTopic7.pipeInput("E", "ee", 3L);
          }
  
          assertEquals(asList(new KeyValueTimestamp<>("A", "aa", 1),
              new KeyValueTimestamp<>("B", "bb", 5),
              new KeyValueTimestamp<>("C", "cc", 10),
              new KeyValueTimestamp<>("D", "dd", 8),
              new KeyValueTimestamp<>("E", "ee", 3)),
              processorSupplier.theCapturedProcessor().processed());
      }
  
      @Test
      public void shouldProcessFromSourcesThatMatchMultiplePattern() {
          final String topic3 = "topic-without-pattern";
  
          final KStream<String, String> pattern2Source1 = builder.stream(Pattern.compile("topic-\\d"));
          final KStream<String, String> pattern2Source2 = builder.stream(Pattern.compile("topic-[A-Z]"));
          final KStream<String, String> source3 = builder.stream(topic3);
          final KStream<String, String> merged = pattern2Source1.merge(pattern2Source2).merge(source3);
  
          merged.process(processorSupplier);
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic3 =
                  driver.createInputTopic("topic-3", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopic4 =
                  driver.createInputTopic("topic-4", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopicA =
                  driver.createInputTopic("topic-A", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopicZ =
                  driver.createInputTopic("topic-Z", new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(topic3, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
  
              inputTopic3.pipeInput("A", "aa", 1L);
              inputTopic4.pipeInput("B", "bb", 5L);
              inputTopicA.pipeInput("C", "cc", 10L);
              inputTopicZ.pipeInput("D", "dd", 8L);
              inputTopic.pipeInput("E", "ee", 3L);
          }
  
          assertEquals(asList(new KeyValueTimestamp<>("A", "aa", 1),
              new KeyValueTimestamp<>("B", "bb", 5),
              new KeyValueTimestamp<>("C", "cc", 10),
              new KeyValueTimestamp<>("D", "dd", 8),
              new KeyValueTimestamp<>("E", "ee", 3)),
              processorSupplier.theCapturedProcessor().processed());
      }
  
      @Test
      public void shouldNotAllowBadProcessSupplierOnProcess() {
          final org.apache.kafka.streams.processor.api.Processor<String, String, Void, Void> processor =
              processorSupplier.get();
          final IllegalArgumentException exception = assertThrows(
              IllegalArgumentException.class,
              () -> testStream.process(() -> processor)
          );
          assertThat(exception.getMessage(), containsString("#get() must return a new object each time it is called."));
      }
  
      @Test
      public void shouldNotAllowBadProcessSupplierOnProcessWithStores() {
          final org.apache.kafka.streams.processor.api.Processor<String, String, Void, Void> processor =
              processorSupplier.get();
          final IllegalArgumentException exception = assertThrows(
                  IllegalArgumentException.class,
              () -> testStream.process(() -> processor, "storeName")
          );
          assertThat(exception.getMessage(), containsString("#get() must return a new object each time it is called."));
      }
  
      @Test
      public void shouldNotAllowBadProcessSupplierOnProcessWithNamed() {
          final org.apache.kafka.streams.processor.api.Processor<String, String, Void, Void> processor =
              processorSupplier.get();
          final IllegalArgumentException exception = assertThrows(
                  IllegalArgumentException.class,
              () -> testStream.process(() -> processor, Named.as("processor"))
          );
          assertThat(exception.getMessage(), containsString("#get() must return a new object each time it is called."));
      }
  
      @Test
      public void shouldNotAllowBadProcessSupplierOnProcessWithNamedAndStores() {
          final org.apache.kafka.streams.processor.api.Processor<String, String, Void, Void> processor =
              processorSupplier.get();
          final IllegalArgumentException exception = assertThrows(
                  IllegalArgumentException.class,
              () -> testStream.process(() -> processor, Named.as("processor"), "storeName")
          );
          assertThat(exception.getMessage(), containsString("#get() must return a new object each time it is called."));
      }
  
      @Test
      public void shouldNotAllowBadProcessSupplierOnProcessValues() {
          final org.apache.kafka.streams.processor.api.FixedKeyProcessor<String, String, Void> processor =
              fixedKeyProcessorSupplier.get();
          final IllegalArgumentException exception = assertThrows(
              IllegalArgumentException.class,
              () -> testStream.processValues(() -> processor)
          );
          assertThat(exception.getMessage(), containsString("#get() must return a new object each time it is called."));
      }
  
      @Test
      public void shouldNotAllowBadProcessSupplierOnProcessValuesWithStores() {
          final org.apache.kafka.streams.processor.api.FixedKeyProcessor<String, String, Void> processor =
              fixedKeyProcessorSupplier.get();
          final IllegalArgumentException exception = assertThrows(
              IllegalArgumentException.class,
              () -> testStream.processValues(() -> processor, "storeName")
          );
          assertThat(exception.getMessage(), containsString("#get() must return a new object each time it is called."));
      }
  
      @Test
      public void shouldNotAllowBadProcessSupplierOnProcessValuesWithNamed() {
          final org.apache.kafka.streams.processor.api.FixedKeyProcessor<String, String, Void> processor =
              fixedKeyProcessorSupplier.get();
          final IllegalArgumentException exception = assertThrows(
              IllegalArgumentException.class,
              () -> testStream.processValues(() -> processor, Named.as("processor"))
          );
          assertThat(exception.getMessage(), containsString("#get() must return a new object each time it is called."));
      }
  
      @Test
      public void shouldNotAllowBadProcessSupplierOnProcessValuesWithNamedAndStores() {
          final org.apache.kafka.streams.processor.api.FixedKeyProcessor<String, String, Void> processor =
              fixedKeyProcessorSupplier.get();
          final IllegalArgumentException exception = assertThrows(
              IllegalArgumentException.class,
              () -> testStream.processValues(() -> processor, Named.as("processor"), "storeName")
          );
          assertThat(exception.getMessage(), containsString("#get() must return a new object each time it is called."));
      }
  
      @Test
      public void shouldNotAllowNullProcessSupplierOnProcess() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process((ProcessorSupplier<? super String, ? super String, Void, Void>) null));
          assertThat(exception.getMessage(), equalTo("processorSupplier cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullProcessSupplierOnProcessWithStores() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process((ProcessorSupplier<? super String, ? super String, Void, Void>) null,
                                       "storeName"));
          assertThat(exception.getMessage(), equalTo("processorSupplier cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullProcessSupplierOnProcessWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process((ProcessorSupplier<? super String, ? super String, Void, Void>) null,
                                       Named.as("processor")));
          assertThat(exception.getMessage(), equalTo("processorSupplier cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullProcessSupplierOnProcessWithNamedAndStores() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process((ProcessorSupplier<? super String, ? super String, Void, Void>) null,
                                       Named.as("processor"), "stateStore"));
          assertThat(exception.getMessage(), equalTo("processorSupplier cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullStoreNamesOnProcess() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process(processorSupplier, (String[]) null));
          assertThat(exception.getMessage(), equalTo("stateStoreNames cannot be a null array"));
      }
  
      @Test
      public void shouldNotAllowNullStoreNameOnProcess() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process(processorSupplier, (String) null));
          assertThat(exception.getMessage(), equalTo("state store name cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullStoreNamesOnProcessWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process(processorSupplier, Named.as("processor"), (String[]) null));
          assertThat(exception.getMessage(), equalTo("stateStoreNames cannot be a null array"));
      }
  
      @Test
      public void shouldNotAllowNullStoreNameOnProcessWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process(processorSupplier, Named.as("processor"), (String) null));
          assertThat(exception.getMessage(), equalTo("state store name cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnProcess() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process(processorSupplier, (Named) null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnProcessWithStores() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process(processorSupplier, (Named) null, "storeName"));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullProcessValuesSupplierOnProcess() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.processValues((FixedKeyProcessorSupplier<? super String, ? super String, Void>) null));
          assertThat(exception.getMessage(), equalTo("processorSupplier cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullProcessSupplierOnProcessValuesWithStores() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.processValues((FixedKeyProcessorSupplier<? super String, ? super String, Void>) null,
                  "storeName"));
          assertThat(exception.getMessage(), equalTo("processorSupplier cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullProcessSupplierOnProcessValuesWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process((ProcessorSupplier<? super String, ? super String, Void, Void>) null,
                  Named.as("processor")));
          assertThat(exception.getMessage(), equalTo("processorSupplier cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullProcessSupplierOnProcessValuesWithNamedAndStores() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.process((ProcessorSupplier<? super String, ? super String, Void, Void>) null,
                  Named.as("processor"), "stateStore"));
          assertThat(exception.getMessage(), equalTo("processorSupplier cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullStoreNamesOnProcessValues() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.processValues(fixedKeyProcessorSupplier, (String[]) null));
          assertThat(exception.getMessage(), equalTo("stateStoreNames cannot be a null array"));
      }
  
      @Test
      public void shouldNotAllowNullStoreNameOnProcessValues() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.processValues(fixedKeyProcessorSupplier, (String) null));
          assertThat(exception.getMessage(), equalTo("state store name cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullStoreNamesOnProcessValuesWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.processValues(fixedKeyProcessorSupplier, Named.as("processor"), (String[]) null));
          assertThat(exception.getMessage(), equalTo("stateStoreNames cannot be a null array"));
      }
  
      @Test
      public void shouldNotAllowNullStoreNameOnProcessValuesWithNamed() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.processValues(fixedKeyProcessorSupplier, Named.as("processor"), (String) null));
          assertThat(exception.getMessage(), equalTo("state store name cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnProcessValues() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.processValues(fixedKeyProcessorSupplier, (Named) null));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotAllowNullNamedOnProcessValuesWithStores() {
          final NullPointerException exception = assertThrows(
              NullPointerException.class,
              () -> testStream.processValues(fixedKeyProcessorSupplier, (Named) null, "storeName"));
          assertThat(exception.getMessage(), equalTo("named cannot be null"));
      }
  
      @Test
      public void shouldNotMaterializedKTableFromKStream() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
  
          final StreamsBuilder builder = new StreamsBuilder();
  
          final String input = "input";
          final String output = "output";
  
          builder.stream(input, consumed).toTable().toStream().to(output);
  
          final String topologyDescription = builder.build().describe().toString();
  
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n" +
                  "   Sub-topology: 0\n" +
                  "    Source: KSTREAM-SOURCE-0000000000 (topics: [input])\n" +
                  "      --> KSTREAM-TOTABLE-0000000001\n" +
                  "    Processor: KSTREAM-TOTABLE-0000000001 (stores: [])\n" +
                  "      --> KTABLE-TOSTREAM-0000000003\n" +
                  "      <-- KSTREAM-SOURCE-0000000000\n" +
                  "    Processor: KTABLE-TOSTREAM-0000000003 (stores: [])\n" +
                  "      --> KSTREAM-SINK-0000000004\n" +
                  "      <-- KSTREAM-TOTABLE-0000000001\n" +
                  "    Sink: KSTREAM-SINK-0000000004 (topic: output)\n" +
                  "      <-- KTABLE-TOSTREAM-0000000003\n\n")
          );
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(input, new StringSerializer(), new StringSerializer());
              final TestOutputTopic<String, String> outputTopic =
                  driver.createOutputTopic(output, new StringDeserializer(), new StringDeserializer());
  
              inputTopic.pipeInput("A", "01", 5L);
              inputTopic.pipeInput("B", "02", 100L);
              inputTopic.pipeInput("C", "03", 0L);
              inputTopic.pipeInput("D", "04", 0L);
              inputTopic.pipeInput("A", "05", 10L);
              inputTopic.pipeInput("A", "06", 8L);
  
              final List<TestRecord<String, String>> outputExpectRecords = new ArrayList<>();
              outputExpectRecords.add(new TestRecord<>("A", "01", Instant.ofEpochMilli(5L)));
              outputExpectRecords.add(new TestRecord<>("B", "02", Instant.ofEpochMilli(100L)));
              outputExpectRecords.add(new TestRecord<>("C", "03", Instant.ofEpochMilli(0L)));
              outputExpectRecords.add(new TestRecord<>("D", "04", Instant.ofEpochMilli(0L)));
              outputExpectRecords.add(new TestRecord<>("A", "05", Instant.ofEpochMilli(10L)));
              outputExpectRecords.add(new TestRecord<>("A", "06", Instant.ofEpochMilli(8L)));
  
              assertEquals(outputTopic.readRecordsToList(), outputExpectRecords);
          }
      }
  
      @Test
      public void shouldProcessWithProcessorAndState() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
  
          final StreamsBuilder builder = new StreamsBuilder();
  
          final String input = "input";
  
          builder.addStateStore(Stores.keyValueStoreBuilder(
              Stores.inMemoryKeyValueStore("sum"),
              Serdes.String(),
              Serdes.Integer()
          ));
  
          builder.stream(input, consumed)
              .process(() -> new Processor<String, String, String, String>() {
                  private KeyValueStore<String, Integer> sumStore;
  
                  @Override
                  public void init(final ProcessorContext<String, String> context) {
                      this.sumStore = context.getStateStore("sum");
                  }
  
                  @Override
                  public void process(final Record<String, String> record) {
                      final String key = record.key();
                      final String value = record.value();
  
                      final Integer counter = sumStore.get(key);
                      if (counter == null) {
                          sumStore.putIfAbsent(key, value.length());
                      } else {
                          if (value == null) {
                              sumStore.delete(key);
                          } else {
                              sumStore.put(key, counter + value.length());
                          }
                      }
                  }
              }, Named.as("p"), "sum");
  
          final String topologyDescription = builder.build().describe().toString();
  
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n"
                  + "   Sub-topology: 0\n"
                  + "    Source: KSTREAM-SOURCE-0000000000 (topics: [input])\n"
                  + "      --> p\n"
                  + "    Processor: p (stores: [sum])\n"
                  + "      --> none\n"
                  + "      <-- KSTREAM-SOURCE-0000000000\n\n")
          );
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(
                      input,
                      new StringSerializer(),
                      new StringSerializer()
                  );
  
              inputTopic.pipeInput("A", "0", 5L);
              inputTopic.pipeInput("B", "00", 100L);
              inputTopic.pipeInput("C", "000", 0L);
              inputTopic.pipeInput("D", "0000", 0L);
              inputTopic.pipeInput("A", "00000", 10L);
              inputTopic.pipeInput("A", "000000", 8L);
  
              final KeyValueStore<String, Integer> sumStore = driver.getKeyValueStore("sum");
              assertEquals(12, sumStore.get("A").intValue());
              assertEquals(2, sumStore.get("B").intValue());
              assertEquals(3, sumStore.get("C").intValue());
              assertEquals(4, sumStore.get("D").intValue());
          }
      }
  
      @Test
      public void shouldBindStateWithProcessorSupplier() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
  
          final StreamsBuilder builder = new StreamsBuilder();
  
          final String input = "input";
  
          builder.stream(input, consumed)
              .process(new ProcessorSupplier<String, String, String, String>() {
  
                  @Override
                  public Processor<String, String, String, String> get() {
                      return new Processor<>() {
                          private KeyValueStore<String, Integer> sumStore;
  
                          @Override
                          public void init(final ProcessorContext<String, String> context) {
                              this.sumStore = context.getStateStore("sum");
                          }
  
                          @Override
                          public void process(final Record<String, String> record) {
                              final String key = record.key();
                              final String value = record.value();
  
                              final Integer counter = sumStore.get(key);
                              if (counter == null) {
                                  sumStore.putIfAbsent(key, value.length());
                              } else {
                                  if (value == null) {
                                      sumStore.delete(key);
                                  } else {
                                      sumStore.put(key, counter + value.length());
                                  }
                              }
                          }
                      };
                  }
  
                  @Override
                  public Set<StoreBuilder<?>> stores() {
                      final Set<StoreBuilder<?>> stores = new HashSet<>();
                      stores.add(Stores.keyValueStoreBuilder(
                          Stores.inMemoryKeyValueStore("sum"),
                          Serdes.String(),
                          Serdes.Integer()
                      ));
                      return stores;
                  }
              }, Named.as("p"));
  
          final String topologyDescription = builder.build().describe().toString();
  
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n"
                  + "   Sub-topology: 0\n"
                  + "    Source: KSTREAM-SOURCE-0000000000 (topics: [input])\n"
                  + "      --> p\n"
                  + "    Processor: p (stores: [sum])\n"
                  + "      --> none\n"
                  + "      <-- KSTREAM-SOURCE-0000000000\n\n")
          );
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(
                      input,
                      new StringSerializer(),
                      new StringSerializer()
                  );
  
              inputTopic.pipeInput("A", "0", 5L);
              inputTopic.pipeInput("B", "00", 100L);
              inputTopic.pipeInput("C", "000", 0L);
              inputTopic.pipeInput("D", "0000", 0L);
              inputTopic.pipeInput("A", "00000", 10L);
              inputTopic.pipeInput("A", "000000", 8L);
  
              final KeyValueStore<String, Integer> sumStore = driver.getKeyValueStore("sum");
              assertEquals(12, sumStore.get("A").intValue());
              assertEquals(2, sumStore.get("B").intValue());
              assertEquals(3, sumStore.get("C").intValue());
              assertEquals(4, sumStore.get("D").intValue());
          }
      }
  
      @Test
      public void shouldProcessValues() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
  
          final StreamsBuilder builder = new StreamsBuilder();
  
          final String input = "input";
          final String output = "output";
  
          builder.stream(input, consumed)
                 .processValues(() -> new ContextualFixedKeyProcessor<String, String, Integer>() {
                     @Override
                     public void process(final FixedKeyRecord<String, String> record) {
                         context().forward(record.withValue(record.value().length()));
                     }
                 }, Named.as("fkp"))
                 .to(output, Produced.valueSerde(Serdes.Integer()));
  
          final String topologyDescription = builder.build().describe().toString();
  
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n" +
                          "   Sub-topology: 0\n" +
                          "    Source: KSTREAM-SOURCE-0000000000 (topics: [input])\n" +
                          "      --> fkp\n" +
                          "    Processor: fkp (stores: [])\n" +
                          "      --> KSTREAM-SINK-0000000001\n" +
                          "      <-- KSTREAM-SOURCE-0000000000\n" +
                          "    Sink: KSTREAM-SINK-0000000001 (topic: output)\n" +
                          "      <-- fkp\n\n")
          );
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(
                      input,
                      new StringSerializer(),
                      new StringSerializer()
                  );
              final TestOutputTopic<String, Integer> outputTopic =
                  driver.createOutputTopic(
                      output,
                      new StringDeserializer(),
                      new IntegerDeserializer()
                  );
  
              inputTopic.pipeInput("A", "0", 5L);
              inputTopic.pipeInput("B", "00", 100L);
              inputTopic.pipeInput("C", "000", 0L);
              inputTopic.pipeInput("D", "0000", 0L);
              inputTopic.pipeInput("A", "00000", 10L);
              inputTopic.pipeInput("A", "000000", 8L);
  
              final List<TestRecord<String, Integer>> outputExpectRecords = new ArrayList<>();
              outputExpectRecords.add(new TestRecord<>("A", 1, Instant.ofEpochMilli(5L)));
              outputExpectRecords.add(new TestRecord<>("B", 2, Instant.ofEpochMilli(100L)));
              outputExpectRecords.add(new TestRecord<>("C", 3, Instant.ofEpochMilli(0L)));
              outputExpectRecords.add(new TestRecord<>("D", 4, Instant.ofEpochMilli(0L)));
              outputExpectRecords.add(new TestRecord<>("A", 5, Instant.ofEpochMilli(10L)));
              outputExpectRecords.add(new TestRecord<>("A", 6, Instant.ofEpochMilli(8L)));
  
              assertEquals(outputTopic.readRecordsToList(), outputExpectRecords);
          }
      }
  
      @Test
      public void shouldMaterializeKTableFromKStream() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
  
          final StreamsBuilder builder = new StreamsBuilder();
          final String storeName = "store";
  
          final String input = "input";
          builder.stream(input, consumed)
              .toTable(Materialized.as(Stores.inMemoryKeyValueStore(storeName)));
  
          final Topology topology = builder.build();
  
          final String topologyDescription = topology.describe().toString();
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n" +
                  "   Sub-topology: 0\n" +
                  "    Source: KSTREAM-SOURCE-0000000000 (topics: [input])\n" +
                  "      --> KSTREAM-TOTABLE-0000000001\n" +
                  "    Processor: KSTREAM-TOTABLE-0000000001 (stores: [store])\n" +
                  "      --> none\n" +
                  "      <-- KSTREAM-SOURCE-0000000000\n\n")
          );
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(topology, props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(input, new StringSerializer(), new StringSerializer());
              final KeyValueStore<String, String> store = driver.getKeyValueStore(storeName);
  
              inputTopic.pipeInput("A", "01");
              inputTopic.pipeInput("B", "02");
              inputTopic.pipeInput("A", "03");
              final Map<String, String> expectedStore = mkMap(mkEntry("A", "03"), mkEntry("B", "02"));
  
              assertThat(asMap(store), is(expectedStore));
          }
      }
  
      @Test
      public void shouldSupportKeyChangeKTableFromKStream() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
  
          final StreamsBuilder builder = new StreamsBuilder();
  
          final String input = "input";
          final String output = "output";
  
          builder.stream(input, consumed)
              .map((key, value) -> new KeyValue<>(key.charAt(0) - 'A', value))
              .toTable(Materialized.with(Serdes.Integer(), null))
              .toStream().to(output);
  
          final Topology topology = builder.build();
  
          final String topologyDescription = topology.describe().toString();
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n" +
                  "   Sub-topology: 0\n" +
                  "    Source: KSTREAM-SOURCE-0000000000 (topics: [input])\n" +
                  "      --> KSTREAM-MAP-0000000001\n" +
                  "    Processor: KSTREAM-MAP-0000000001 (stores: [])\n" +
                  "      --> KSTREAM-FILTER-0000000005\n" +
                  "      <-- KSTREAM-SOURCE-0000000000\n" +
                  "    Processor: KSTREAM-FILTER-0000000005 (stores: [])\n" +
                  "      --> KSTREAM-SINK-0000000004\n" +
                  "      <-- KSTREAM-MAP-0000000001\n" +
                  "    Sink: KSTREAM-SINK-0000000004 (topic: KSTREAM-TOTABLE-0000000002-repartition)\n" +
                  "      <-- KSTREAM-FILTER-0000000005\n" +
                  "\n" +
                  "  Sub-topology: 1\n" +
                  "    Source: KSTREAM-SOURCE-0000000006 (topics: [KSTREAM-TOTABLE-0000000002-repartition])\n" +
                  "      --> KSTREAM-TOTABLE-0000000002\n" +
                  "    Processor: KSTREAM-TOTABLE-0000000002 (stores: [])\n" +
                  "      --> KTABLE-TOSTREAM-0000000007\n" +
                  "      <-- KSTREAM-SOURCE-0000000006\n" +
                  "    Processor: KTABLE-TOSTREAM-0000000007 (stores: [])\n" +
                  "      --> KSTREAM-SINK-0000000008\n" +
                  "      <-- KSTREAM-TOTABLE-0000000002\n" +
                  "    Sink: KSTREAM-SINK-0000000008 (topic: output)\n" +
                  "      <-- KTABLE-TOSTREAM-0000000007\n\n")
          );
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(topology, props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(input, new StringSerializer(), new StringSerializer());
              final TestOutputTopic<Integer, String> outputTopic =
                  driver.createOutputTopic(output, new IntegerDeserializer(), new StringDeserializer());
  
              inputTopic.pipeInput("A", "01", 5L);
              inputTopic.pipeInput("B", "02", 100L);
              inputTopic.pipeInput("C", "03", 0L);
              inputTopic.pipeInput("D", "04", 0L);
              inputTopic.pipeInput("A", "05", 10L);
              inputTopic.pipeInput("A", "06", 8L);
  
              final List<TestRecord<Integer, String>> outputExpectRecords = new ArrayList<>();
              outputExpectRecords.add(new TestRecord<>(0, "01", Instant.ofEpochMilli(5L)));
              outputExpectRecords.add(new TestRecord<>(1, "02", Instant.ofEpochMilli(100L)));
              outputExpectRecords.add(new TestRecord<>(2, "03", Instant.ofEpochMilli(0L)));
              outputExpectRecords.add(new TestRecord<>(3, "04", Instant.ofEpochMilli(0L)));
              outputExpectRecords.add(new TestRecord<>(0, "05", Instant.ofEpochMilli(10L)));
              outputExpectRecords.add(new TestRecord<>(0, "06", Instant.ofEpochMilli(8L)));
  
              assertEquals(outputTopic.readRecordsToList(), outputExpectRecords);
          }
      }
  
      @Test
      public void shouldSupportForeignKeyTableTableJoinWithKTableFromKStream() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
          final StreamsBuilder builder = new StreamsBuilder();
  
          final String input1 = "input1";
          final String input2 = "input2";
          final String output = "output";
  
          final KTable<String, String> leftTable = builder.stream(input1, consumed).toTable();
          final KTable<String, String> rightTable = builder.stream(input2, consumed).toTable();
  
          final Function<String, String> extractor = value -> value.split("\\|")[1];
          final ValueJoiner<String, String, String> joiner = (value1, value2) -> "(" + value1 + "," + value2 + ")";
  
          leftTable.join(rightTable, extractor, joiner).toStream().to(output);
  
          final Topology topology = builder.build(props);
  
          final String topologyDescription = topology.describe().toString();
  
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n" +
                  "   Sub-topology: 0\n" +
                  "    Source: KTABLE-SOURCE-0000000016 (topics: [KTABLE-FK-JOIN-SUBSCRIPTION-RESPONSE-0000000014-topic])\n" +
                  "      --> KTABLE-FK-JOIN-SUBSCRIPTION-RESPONSE-RESOLVER-PROCESSOR-0000000017\n" +
                  "    Source: KSTREAM-SOURCE-0000000000 (topics: [input1])\n" +
                  "      --> KSTREAM-TOTABLE-0000000001\n" +
                  "    Processor: KTABLE-FK-JOIN-SUBSCRIPTION-RESPONSE-RESOLVER-PROCESSOR-0000000017 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000002])\n" +
                  "      --> KTABLE-FK-JOIN-OUTPUT-0000000018\n" +
                  "      <-- KTABLE-SOURCE-0000000016\n" +
                  "    Processor: KSTREAM-TOTABLE-0000000001 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000002])\n" +
                  "      --> KTABLE-FK-JOIN-SUBSCRIPTION-REGISTRATION-0000000007\n" +
                  "      <-- KSTREAM-SOURCE-0000000000\n" +
                  "    Processor: KTABLE-FK-JOIN-OUTPUT-0000000018 (stores: [])\n" +
                  "      --> KTABLE-TOSTREAM-0000000020\n" +
                  "      <-- KTABLE-FK-JOIN-SUBSCRIPTION-RESPONSE-RESOLVER-PROCESSOR-0000000017\n" +
                  "    Processor: KTABLE-FK-JOIN-SUBSCRIPTION-REGISTRATION-0000000007 (stores: [])\n" +
                  "      --> KTABLE-SINK-0000000008\n" +
                  "      <-- KSTREAM-TOTABLE-0000000001\n" +
                  "    Processor: KTABLE-TOSTREAM-0000000020 (stores: [])\n" +
                  "      --> KSTREAM-SINK-0000000021\n" +
                  "      <-- KTABLE-FK-JOIN-OUTPUT-0000000018\n" +
                  "    Sink: KSTREAM-SINK-0000000021 (topic: output)\n" +
                  "      <-- KTABLE-TOSTREAM-0000000020\n" +
                  "    Sink: KTABLE-SINK-0000000008 (topic: KTABLE-FK-JOIN-SUBSCRIPTION-REGISTRATION-0000000006-topic)\n" +
                  "      <-- KTABLE-FK-JOIN-SUBSCRIPTION-REGISTRATION-0000000007\n" +
                  "\n" +
                  "  Sub-topology: 1\n" +
                  "    Source: KSTREAM-SOURCE-0000000003 (topics: [input2])\n" +
                  "      --> KSTREAM-TOTABLE-0000000004\n" +
                  "    Source: KTABLE-SOURCE-0000000009 (topics: [KTABLE-FK-JOIN-SUBSCRIPTION-REGISTRATION-0000000006-topic])\n" +
                  "      --> KTABLE-FK-JOIN-SUBSCRIPTION-PROCESSOR-0000000011\n" +
                  "    Processor: KSTREAM-TOTABLE-0000000004 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000005])\n" +
                  "      --> KTABLE-FK-JOIN-SUBSCRIPTION-PROCESSOR-0000000013\n" +
                  "      <-- KSTREAM-SOURCE-0000000003\n" +
                  "    Processor: KTABLE-FK-JOIN-SUBSCRIPTION-PROCESSOR-0000000011 (stores: [KTABLE-FK-JOIN-SUBSCRIPTION-STATE-STORE-0000000010])\n" +
                  "      --> KTABLE-FK-JOIN-SUBSCRIPTION-PROCESSOR-0000000012\n" +
                  "      <-- KTABLE-SOURCE-0000000009\n" +
                  "    Processor: KTABLE-FK-JOIN-SUBSCRIPTION-PROCESSOR-0000000012 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000005])\n" +
                  "      --> KTABLE-SINK-0000000015\n" +
                  "      <-- KTABLE-FK-JOIN-SUBSCRIPTION-PROCESSOR-0000000011\n" +
                  "    Processor: KTABLE-FK-JOIN-SUBSCRIPTION-PROCESSOR-0000000013 (stores: [KTABLE-FK-JOIN-SUBSCRIPTION-STATE-STORE-0000000010])\n" +
                  "      --> KTABLE-SINK-0000000015\n" +
                  "      <-- KSTREAM-TOTABLE-0000000004\n" +
                  "    Sink: KTABLE-SINK-0000000015 (topic: KTABLE-FK-JOIN-SUBSCRIPTION-RESPONSE-0000000014-topic)\n" +
                  "      <-- KTABLE-FK-JOIN-SUBSCRIPTION-PROCESSOR-0000000012, KTABLE-FK-JOIN-SUBSCRIPTION-PROCESSOR-0000000013\n\n")
          );
  
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(topology, props)) {
              final TestInputTopic<String, String> left = driver.createInputTopic(input1, new StringSerializer(), new StringSerializer());
              final TestInputTopic<String, String> right = driver.createInputTopic(input2, new StringSerializer(), new StringSerializer());
              final TestOutputTopic<String, String> outputTopic = driver.createOutputTopic(output, new StringDeserializer(), new StringDeserializer());
  
              // Pre-populate the RHS records. This test is all about what happens when we add/remove LHS records
              right.pipeInput("rhs1", "rhsValue1");
              right.pipeInput("rhs2", "rhsValue2");
              right.pipeInput("rhs3", "rhsValue3"); // this unreferenced FK won't show up in any results
  
              assertThat(outputTopic.readKeyValuesToMap(), is(emptyMap()));
  
              left.pipeInput("lhs1", "lhsValue1|rhs1");
              left.pipeInput("lhs2", "lhsValue2|rhs2");
  
              final Map<String, String> expected = mkMap(
                  mkEntry("lhs1", "(lhsValue1|rhs1,rhsValue1)"),
                  mkEntry("lhs2", "(lhsValue2|rhs2,rhsValue2)")
              );
              assertThat(outputTopic.readKeyValuesToMap(), is(expected));
  
              // Add another reference to an existing FK
              left.pipeInput("lhs3", "lhsValue3|rhs1");
  
              assertThat(
                  outputTopic.readKeyValuesToMap(),
                  is(mkMap(
                      mkEntry("lhs3", "(lhsValue3|rhs1,rhsValue1)")
                  ))
              );
  
              left.pipeInput("lhs1", (String) null);
              assertThat(
                  outputTopic.readKeyValuesToMap(),
                  is(mkMap(
                      mkEntry("lhs1", null)
                  ))
              );
          }
      }
  
      @Test
      public void shouldSupportTableTableJoinWithKStreamToKTable() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
          final StreamsBuilder builder = new StreamsBuilder();
  
          final String leftTopic = "left";
          final String rightTopic = "right";
          final String outputTopic = "output";
  
          final KTable<String, String> table1 = builder.stream(leftTopic, consumed).toTable();
          final KTable<String, String> table2 = builder.stream(rightTopic, consumed).toTable();
  
          table1.join(table2, MockValueJoiner.TOSTRING_JOINER).toStream().to(outputTopic);
  
          final Topology topology = builder.build(props);
  
          final String topologyDescription = topology.describe().toString();
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n" +
                  "   Sub-topology: 0\n" +
                  "    Source: KSTREAM-SOURCE-0000000000 (topics: [left])\n" +
                  "      --> KSTREAM-TOTABLE-0000000001\n" +
                  "    Source: KSTREAM-SOURCE-0000000003 (topics: [right])\n" +
                  "      --> KSTREAM-TOTABLE-0000000004\n" +
                  "    Processor: KSTREAM-TOTABLE-0000000001 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000002])\n" +
                  "      --> KTABLE-JOINTHIS-0000000007\n" +
                  "      <-- KSTREAM-SOURCE-0000000000\n" +
                  "    Processor: KSTREAM-TOTABLE-0000000004 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000005])\n" +
                  "      --> KTABLE-JOINOTHER-0000000008\n" +
                  "      <-- KSTREAM-SOURCE-0000000003\n" +
                  "    Processor: KTABLE-JOINOTHER-0000000008 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000002])\n" +
                  "      --> KTABLE-MERGE-0000000006\n" +
                  "      <-- KSTREAM-TOTABLE-0000000004\n" +
                  "    Processor: KTABLE-JOINTHIS-0000000007 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000005])\n" +
                  "      --> KTABLE-MERGE-0000000006\n" +
                  "      <-- KSTREAM-TOTABLE-0000000001\n" +
                  "    Processor: KTABLE-MERGE-0000000006 (stores: [])\n" +
                  "      --> KTABLE-TOSTREAM-0000000009\n" +
                  "      <-- KTABLE-JOINTHIS-0000000007, KTABLE-JOINOTHER-0000000008\n" +
                  "    Processor: KTABLE-TOSTREAM-0000000009 (stores: [])\n" +
                  "      --> KSTREAM-SINK-0000000010\n" +
                  "      <-- KTABLE-MERGE-0000000006\n" +
                  "    Sink: KSTREAM-SINK-0000000010 (topic: output)\n" +
                  "      <-- KTABLE-TOSTREAM-0000000009\n\n"));
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(topology, props)) {
              final TestInputTopic<String, String> left = driver.createInputTopic(leftTopic, new StringSerializer(), new StringSerializer());
              final TestInputTopic<String, String> right = driver.createInputTopic(rightTopic, new StringSerializer(), new StringSerializer());
              final TestOutputTopic<String, String> output = driver.createOutputTopic(outputTopic, new StringDeserializer(), new StringDeserializer());
  
              right.pipeInput("lhs1", "rhsValue1");
              right.pipeInput("rhs2", "rhsValue2");
              right.pipeInput("lhs3", "rhsValue3");
  
              assertThat(output.readKeyValuesToMap(), is(emptyMap()));
  
              left.pipeInput("lhs1", "lhsValue1");
              left.pipeInput("lhs2", "lhsValue2");
  
              final Map<String, String> expected = mkMap(
                  mkEntry("lhs1", "lhsValue1+rhsValue1")
              );
  
              assertThat(
                  output.readKeyValuesToMap(),
                  is(expected)
              );
  
              left.pipeInput("lhs3", "lhsValue3");
  
              assertThat(
                  output.readKeyValuesToMap(),
                  is(mkMap(
                      mkEntry("lhs3", "lhsValue3+rhsValue3")
                  ))
              );
  
              left.pipeInput("lhs1", "lhsValue4");
              assertThat(
                  output.readKeyValuesToMap(),
                  is(mkMap(
                      mkEntry("lhs1", "lhsValue4+rhsValue1")
                  ))
              );
          }
      }
  
      @Test
      public void shouldSupportStreamTableJoinWithKStreamToKTable() {
          final StreamsBuilder builder = new StreamsBuilder();
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
  
          final String streamTopic = "streamTopic";
          final String tableTopic = "tableTopic";
          final String outputTopic = "output";
  
          final KStream<String, String> stream = builder.stream(streamTopic, consumed);
          final KTable<String, String> table =  builder.stream(tableTopic, consumed).toTable();
  
          stream.join(table, MockValueJoiner.TOSTRING_JOINER).to(outputTopic);
  
          final Topology topology = builder.build(props);
  
          final String topologyDescription = topology.describe().toString();
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n" +
                  "   Sub-topology: 0\n" +
                  "    Source: KSTREAM-SOURCE-0000000000 (topics: [streamTopic])\n" +
                  "      --> KSTREAM-JOIN-0000000004\n" +
                  "    Processor: KSTREAM-JOIN-0000000004 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000003])\n" +
                  "      --> KSTREAM-SINK-0000000005\n" +
                  "      <-- KSTREAM-SOURCE-0000000000\n" +
                  "    Source: KSTREAM-SOURCE-0000000001 (topics: [tableTopic])\n" +
                  "      --> KSTREAM-TOTABLE-0000000002\n" +
                  "    Sink: KSTREAM-SINK-0000000005 (topic: output)\n" +
                  "      <-- KSTREAM-JOIN-0000000004\n" +
                  "    Processor: KSTREAM-TOTABLE-0000000002 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000003])\n" +
                  "      --> none\n" +
                  "      <-- KSTREAM-SOURCE-0000000001\n\n"));
  
          try (final TopologyTestDriver driver = new TopologyTestDriver(topology, props)) {
              final TestInputTopic<String, String> left = driver.createInputTopic(streamTopic, new StringSerializer(), new StringSerializer());
              final TestInputTopic<String, String> right = driver.createInputTopic(tableTopic, new StringSerializer(), new StringSerializer());
              final TestOutputTopic<String, String> output = driver.createOutputTopic(outputTopic, new StringDeserializer(), new StringDeserializer());
  
              right.pipeInput("lhs1", "rhsValue1");
              right.pipeInput("rhs2", "rhsValue2");
              right.pipeInput("lhs3", "rhsValue3");
  
              assertThat(output.readKeyValuesToMap(), is(emptyMap()));
  
              left.pipeInput("lhs1", "lhsValue1");
              left.pipeInput("lhs2", "lhsValue2");
  
              final Map<String, String> expected = mkMap(
                  mkEntry("lhs1", "lhsValue1+rhsValue1")
              );
  
              assertThat(
                  output.readKeyValuesToMap(),
                  is(expected)
              );
  
              left.pipeInput("lhs3", "lhsValue3");
  
              assertThat(
                  output.readKeyValuesToMap(),
                  is(mkMap(
                      mkEntry("lhs3", "lhsValue3+rhsValue3")
                  ))
              );
  
              left.pipeInput("lhs1", "lhsValue4");
              assertThat(
                  output.readKeyValuesToMap(),
                  is(mkMap(
                      mkEntry("lhs1", "lhsValue4+rhsValue1")
                  ))
              );
          }
      }
  
      @Test
      public void shouldSupportGroupByCountWithKStreamToKTable() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
          final StreamsBuilder builder = new StreamsBuilder();
  
          final String input = "input";
          final String output = "output";
  
          builder
              .stream(input, consumed)
              .toTable()
              .groupBy(MockMapper.selectValueKeyValueMapper(), Grouped.with(Serdes.String(), Serdes.String()))
              .count()
              .toStream()
              .to(output);
  
          final Topology topology = builder.build(props);
  
          final String topologyDescription = topology.describe().toString();
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n" +
                  "   Sub-topology: 0\n" +
                  "    Source: KSTREAM-SOURCE-0000000000 (topics: [input])\n" +
                  "      --> KSTREAM-TOTABLE-0000000001\n" +
                  "    Processor: KSTREAM-TOTABLE-0000000001 (stores: [KSTREAM-TOTABLE-STATE-STORE-0000000002])\n" +
                  "      --> KTABLE-SELECT-0000000003\n" +
                  "      <-- KSTREAM-SOURCE-0000000000\n" +
                  "    Processor: KTABLE-SELECT-0000000003 (stores: [])\n" +
                  "      --> KSTREAM-SINK-0000000005\n" +
                  "      <-- KSTREAM-TOTABLE-0000000001\n" +
                  "    Sink: KSTREAM-SINK-0000000005 (topic: KTABLE-AGGREGATE-STATE-STORE-0000000004-repartition)\n" +
                  "      <-- KTABLE-SELECT-0000000003\n" +
                  "\n" +
                  "  Sub-topology: 1\n" +
                  "    Source: KSTREAM-SOURCE-0000000006 (topics: [KTABLE-AGGREGATE-STATE-STORE-0000000004-repartition])\n" +
                  "      --> KTABLE-AGGREGATE-0000000007\n" +
                  "    Processor: KTABLE-AGGREGATE-0000000007 (stores: [KTABLE-AGGREGATE-STATE-STORE-0000000004])\n" +
                  "      --> KTABLE-TOSTREAM-0000000008\n" +
                  "      <-- KSTREAM-SOURCE-0000000006\n" +
                  "    Processor: KTABLE-TOSTREAM-0000000008 (stores: [])\n" +
                  "      --> KSTREAM-SINK-0000000009\n" +
                  "      <-- KTABLE-AGGREGATE-0000000007\n" +
                  "    Sink: KSTREAM-SINK-0000000009 (topic: output)\n" +
                  "      <-- KTABLE-TOSTREAM-0000000008\n\n"));
  
          try (
              final TopologyTestDriver driver = new TopologyTestDriver(builder.build(), props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(input, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestOutputTopic<String, Long> outputTopic =
                  driver.createOutputTopic(output, new StringDeserializer(), new LongDeserializer());
  
              inputTopic.pipeInput("A", "green", 10L);
              inputTopic.pipeInput("B", "green", 9L);
              inputTopic.pipeInput("A", "blue", 12L);
              inputTopic.pipeInput("C", "yellow", 15L);
              inputTopic.pipeInput("D", "green", 11L);
  
              assertEquals(
                  asList(
                      new TestRecord<>("green", 1L, Instant.ofEpochMilli(10)),
                      new TestRecord<>("green", 2L, Instant.ofEpochMilli(10)),
                      new TestRecord<>("green", 1L, Instant.ofEpochMilli(12)),
                      new TestRecord<>("blue", 1L, Instant.ofEpochMilli(12)),
                      new TestRecord<>("yellow", 1L, Instant.ofEpochMilli(15)),
                      new TestRecord<>("green", 2L, Instant.ofEpochMilli(12))),
                  outputTopic.readRecordsToList());
          }
      }
  
      @Test
      public void shouldSupportTriggerMaterializedWithKTableFromKStream() {
          final Consumed<String, String> consumed = Consumed.with(Serdes.String(), Serdes.String());
          final StreamsBuilder builder = new StreamsBuilder();
  
          final String input = "input";
          final String output = "output";
          final String storeName = "store";
  
          builder.stream(input, consumed)
              .toTable()
              .mapValues(
                  value -> value.charAt(0) - (int) 'a',
                  Materialized.<String, Integer, KeyValueStore<Bytes, byte[]>>as(storeName)
                      .withKeySerde(Serdes.String())
                      .withValueSerde(Serdes.Integer()))
              .toStream()
              .to(output);
  
          final Topology topology = builder.build(props);
  
          final String topologyDescription = topology.describe().toString();
          assertThat(
              topologyDescription,
              equalTo("Topologies:\n" +
                  "   Sub-topology: 0\n" +
                  "    Source: KSTREAM-SOURCE-0000000000 (topics: [input])\n" +
                  "      --> KSTREAM-TOTABLE-0000000001\n" +
                  "    Processor: KSTREAM-TOTABLE-0000000001 (stores: [])\n" +
                  "      --> KTABLE-MAPVALUES-0000000003\n" +
                  "      <-- KSTREAM-SOURCE-0000000000\n" +
                  "    Processor: KTABLE-MAPVALUES-0000000003 (stores: [store])\n" +
                  "      --> KTABLE-TOSTREAM-0000000004\n" +
                  "      <-- KSTREAM-TOTABLE-0000000001\n" +
                  "    Processor: KTABLE-TOSTREAM-0000000004 (stores: [])\n" +
                  "      --> KSTREAM-SINK-0000000005\n" +
                  "      <-- KTABLE-MAPVALUES-0000000003\n" +
                  "    Sink: KSTREAM-SINK-0000000005 (topic: output)\n" +
                  "      <-- KTABLE-TOSTREAM-0000000004\n\n"));
  
          try (
              final TopologyTestDriver driver = new TopologyTestDriver(topology, props)) {
              final TestInputTopic<String, String> inputTopic =
                  driver.createInputTopic(input, new StringSerializer(), new StringSerializer(), Instant.ofEpochMilli(0L), Duration.ZERO);
              final TestOutputTopic<String, Integer> outputTopic =
                  driver.createOutputTopic(output, new StringDeserializer(), new IntegerDeserializer());
              final KeyValueStore<String, Integer> store = driver.getKeyValueStore(storeName);
  
              inputTopic.pipeInput("A", "green", 10L);
              inputTopic.pipeInput("B", "green", 9L);
              inputTopic.pipeInput("A", "blue", 12L);
              inputTopic.pipeInput("C", "yellow", 15L);
              inputTopic.pipeInput("D", "green", 11L);
  
              final Map<String, Integer> expectedStore = new HashMap<>();
              expectedStore.putIfAbsent("A", 1);
              expectedStore.putIfAbsent("B", 6);
              expectedStore.putIfAbsent("C", 24);
              expectedStore.putIfAbsent("D", 6);
  
              assertEquals(expectedStore, asMap(store));
  
              assertEquals(
                  asList(
                      new TestRecord<>("A", 6, Instant.ofEpochMilli(10)),
                      new TestRecord<>("B", 6, Instant.ofEpochMilli(9)),
                      new TestRecord<>("A", 1, Instant.ofEpochMilli(12)),
                      new TestRecord<>("C", 24, Instant.ofEpochMilli(15)),
                      new TestRecord<>("D", 6, Instant.ofEpochMilli(11))),
                  outputTopic.readRecordsToList());
  
          }
      }
  
      private static <K, V> Map<K, V> asMap(final KeyValueStore<K, V> store) {
          final HashMap<K, V> result = new HashMap<>();
          try (final KeyValueIterator<K, V> it = store.all()) {
              it.forEachRemaining(kv -> result.put(kv.key, kv.value));
          }
          return result;
      }
  }
  