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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.
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  package org.apache.beam.learning.katas.windowing.fixedwindow;
  
  import java.io.Serializable;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.apache.beam.sdk.transforms.ParDo;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.TimestampedValue;
  import org.joda.time.Instant;
  import org.junit.Rule;
  import org.junit.Test;
  
  public class TaskTest implements Serializable {
  
    @Rule
    public final transient TestPipeline testPipeline = TestPipeline.create();
  
    @Test
    public void fixedWindow() {
      PCollection<String> eventsPColl =
          testPipeline.apply(
              Create.timestamped(
                  TimestampedValue.of("event", Instant.parse("2019-06-01T00:00:00+00:00")),
                  TimestampedValue.of("event", Instant.parse("2019-06-01T00:00:00+00:00")),
                  TimestampedValue.of("event", Instant.parse("2019-06-01T00:00:00+00:00")),
                  TimestampedValue.of("event", Instant.parse("2019-06-01T00:00:00+00:00")),
                  TimestampedValue.of("event", Instant.parse("2019-06-05T00:00:00+00:00")),
                  TimestampedValue.of("event", Instant.parse("2019-06-05T00:00:00+00:00")),
                  TimestampedValue.of("event", Instant.parse("2019-06-08T00:00:00+00:00")),
                  TimestampedValue.of("event", Instant.parse("2019-06-08T00:00:00+00:00")),
                  TimestampedValue.of("event", Instant.parse("2019-06-08T00:00:00+00:00")),
                  TimestampedValue.of("event", Instant.parse("2019-06-10T00:00:00+00:00"))
              )
          );
  
      PCollection<KV<String, Long>> results = Task.applyTransform(eventsPColl);
  
      PCollection<WindowedEvent> windowedResults =
          results.apply("WindowedEvent",
              ParDo.of(new DoFn<KV<String, Long>, WindowedEvent>() {
  
                @ProcessElement
                public void processElement(@Element KV<String, Long> element,
                    BoundedWindow window, OutputReceiver<WindowedEvent> out) {
  
                  out.output(
                      new WindowedEvent(element.getKey(), element.getValue(), window.toString()));
                }
  
              })
          );
  
      PAssert.that(windowedResults)
          .containsInAnyOrder(
              new WindowedEvent("event", 4L, "[2019-06-01T00:00:00.000Z..2019-06-02T00:00:00.000Z)"),
              new WindowedEvent("event", 2L, "[2019-06-05T00:00:00.000Z..2019-06-06T00:00:00.000Z)"),
              new WindowedEvent("event", 3L, "[2019-06-08T00:00:00.000Z..2019-06-09T00:00:00.000Z)"),
              new WindowedEvent("event", 1L, "[2019-06-10T00:00:00.000Z..2019-06-11T00:00:00.000Z)")
          );
  
      testPipeline.run().waitUntilFinish();
    }
  
  }