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.examples.wordcount;
  
  import org.apache.kafka.common.serialization.Serdes;
  import org.apache.kafka.streams.processor.api.MockProcessorContext;
  import org.apache.kafka.streams.processor.api.Processor;
  import org.apache.kafka.streams.processor.api.Record;
  import org.apache.kafka.streams.state.KeyValueStore;
  import org.apache.kafka.streams.state.Stores;
  
  import org.junit.jupiter.api.Test;
  
  import java.util.Arrays;
  import java.util.List;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  /**
   * Demonstrate the use of {@link MockProcessorContext} for testing the {@link Processor} in the {@link WordCountProcessorDemo}.
   */
  public class WordCountProcessorTest {
      @Test
      public void test() {
          final MockProcessorContext<String, String> context = new MockProcessorContext<>();
  
          // Create, initialize, and register the state store.
          final KeyValueStore<String, Integer> store =
              Stores.keyValueStoreBuilder(Stores.inMemoryKeyValueStore("Counts"), Serdes.String(), Serdes.Integer())
                  .withLoggingDisabled() // Changelog is not supported by MockProcessorContext.
                  // Caching is disabled by default, but FYI: caching is also not supported by MockProcessorContext.
                  .build();
          store.init(context.getStateStoreContext(), store);
  
          // Create and initialize the processor under test
          final Processor<String, String, String, String> processor = new WordCountProcessorDemo.WordCountProcessor();
          processor.init(context);
  
          // send a record to the processor
          processor.process(new Record<>("key", "alpha beta\tgamma\n\talpha", 0L));
  
          // note that the processor does not forward during process()
          assertTrue(context.forwarded().isEmpty());
  
          // now, we trigger the punctuator, which iterates over the state store and forwards the contents.
          context.scheduledPunctuators().get(0).getPunctuator().punctuate(0L);
  
          // finally, we can verify the output.
          final List<MockProcessorContext.CapturedForward<String, String>> expected = Arrays.asList(
              new MockProcessorContext.CapturedForward<>(new Record<>("alpha", "2", 0L)),
              new MockProcessorContext.CapturedForward<>(new Record<>("beta", "1", 0L)),
              new MockProcessorContext.CapturedForward<>(new Record<>("gamma", "1", 0L))
          );
          assertThat(context.forwarded(), is(expected));
      }
  }
  