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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
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  package org.apache.beam.runners.dataflow.worker;
  
  import static org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.base.Preconditions.checkState;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  
  import org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoFn;
  import org.apache.beam.runners.dataflow.worker.util.common.worker.Receiver;
  import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
  import org.apache.beam.sdk.transforms.windowing.PaneInfo;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.WindowedValue;
  import org.apache.beam.sdk.values.WindowedValues;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.joda.time.Instant;
  import org.junit.Test;
  
  /** Tests for {@link ReifyTimestampAndWindowsParDoFnFactory} */
  public class ReifyTimestampAndWindowsParDoFnFactoryTest {
  
    private <K, V> void verifyReifiedIsInTheSameWindows(WindowedValue<KV<K, V>> elem)
        throws Exception {
      ParDoFn reifyFn =
          new ReifyTimestampAndWindowsParDoFnFactory()
              .create(null, null, null, null, null, null, null);
  
      SingleValueReceiver<WindowedValue<KV<K, WindowedValue<V>>>> receiver =
          new SingleValueReceiver<>();
  
      reifyFn.startBundle(receiver);
  
      // The important thing to test that is not just a restatement of the ParDoFn is that
      // it only produces one element per input
      reifyFn.processElement(elem);
  
      assertThat(receiver.reified.getValue().getKey(), equalTo(elem.getValue().getKey()));
      assertThat(
          receiver.reified.getValue().getValue().getValue(), equalTo(elem.getValue().getValue()));
      assertThat(receiver.reified.getValue().getValue().getTimestamp(), equalTo(elem.getTimestamp()));
      assertThat(receiver.reified.getValue().getValue().getWindows(), equalTo(elem.getWindows()));
      assertThat(receiver.reified.getValue().getValue().getPaneInfo(), equalTo(elem.getPaneInfo()));
    }
  
    @Test
    public void testSingleWindow() throws Exception {
      verifyReifiedIsInTheSameWindows(
          WindowedValues.of(
              KV.of(42, "bizzle"),
              new Instant(73),
              new IntervalWindow(new Instant(5), new Instant(15)),
              PaneInfo.NO_FIRING));
    }
  
    @Test
    public void testMultiWindowStaysCompressed() throws Exception {
      verifyReifiedIsInTheSameWindows(
          WindowedValues.of(
              KV.of(42, "bizzle"),
              new Instant(73),
              ImmutableList.of(
                  new IntervalWindow(new Instant(5), new Instant(15)),
                  new IntervalWindow(new Instant(17), new Instant(97))),
              PaneInfo.NO_FIRING));
    }
  
    private static class SingleValueReceiver<T> implements Receiver {
  
      public @Nullable T reified = null;
  
      @Override
      public void process(Object outputElem) throws Exception {
        checkState(reified == null, "Element output more than once");
        reified = (T) outputElem;
      }
    }
  }
  