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   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.kafka.streams.examples.wordcount;
  
  import org.apache.kafka.streams.processor.Cancellable;
  import org.apache.kafka.streams.processor.PunctuationType;
  import org.apache.kafka.streams.processor.Punctuator;
  import org.apache.kafka.streams.processor.StateStore;
  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.StoreBuilder;
  
  import org.junit.jupiter.api.Test;
  
  import java.time.Duration;
  import java.util.List;
  
  import static java.util.Arrays.asList;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.is;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  /**
   * Demonstrate the use of {@link MockProcessorContext} for testing the {@link org.apache.kafka.streams.kstream.Transformer} in the {@link WordCountTransformerDemo}.
   */
  public class WordCountTransformerTest {
      @Test
      public void test() {
          final MockProcessorContext<String, String> context = new MockProcessorContext<>();
  
          // Create and initialize the transformer under test; including its provided store
          final WordCountTransformerDemo.MyProcessorSupplier supplier = new WordCountTransformerDemo.MyProcessorSupplier();
          for (final StoreBuilder<?> storeBuilder : supplier.stores()) {
              final StateStore store = storeBuilder
                  .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);
              context.getStateStoreContext().register(store, null);
          }
          final Processor<String, String, String, String> processor = supplier.get();
          processor.init(new org.apache.kafka.streams.processor.api.MockProcessorContext<>() {
              @Override
              public <S extends StateStore> S getStateStore(final String name) {
                  return context.getStateStore(name);
              }
  
              @Override
              public <K extends String, V extends String> void forward(final Record<K, V> record) {
                  context.forward(record);
              }
  
              @Override
              public Cancellable schedule(final Duration interval, final PunctuationType type, final Punctuator callback) {
                  return context.schedule(interval, type, callback);
              }
          });
  
          // send a record to the transformer
          final Record<String, String> record = new Record<>("key", "alpha beta\tgamma\n\talpha", 0L);
          processor.process(record);
  
          // note that the transformer does not forward during transform()
          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<? extends String, ? extends String>> capturedForwards = context.forwarded();
          final List<MockProcessorContext.CapturedForward<? extends String, ? extends String>> expected = 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(capturedForwards, is(expected));
      }
  }
  