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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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,
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   * See the License for the specific language governing permissions and
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  package org.apache.beam.sdk.extensions.euphoria.core.client.operator;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  
  import org.apache.beam.sdk.extensions.euphoria.core.client.util.Triple;
  import org.apache.beam.sdk.transforms.windowing.DefaultTrigger;
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.transforms.windowing.Window;
  import org.apache.beam.sdk.transforms.windowing.WindowDesc;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.TypeDescriptors;
  import org.apache.beam.sdk.values.WindowingStrategy.AccumulationMode;
  import org.joda.time.Duration;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Test behavior of operator {@code TopPerKey}. */
  @RunWith(JUnit4.class)
  @SuppressWarnings({
    "rawtypes" // TODO(https://github.com/apache/beam/issues/20447)
  })
  public class TopPerKeyTest {
  
    @Test
    public void testBuild() {
      final PCollection<String> dataset = TestUtils.createMockDataset(TypeDescriptors.strings());
      final FixedWindows windowing = FixedWindows.of(org.joda.time.Duration.standardHours(1));
      final DefaultTrigger trigger = DefaultTrigger.of();
      final PCollection<Triple<String, Long, Long>> result =
          TopPerKey.named("TopPerKey1")
              .of(dataset)
              .keyBy(s -> s)
              .valueBy(s -> 1L)
              .scoreBy(s -> 1L)
              .windowBy(windowing)
              .triggeredBy(trigger)
              .discardingFiredPanes()
              .withAllowedLateness(Duration.millis(1000))
              .output();
      final TopPerKey tpk = (TopPerKey) TestUtils.getProducer(result);
      assertTrue(tpk.getName().isPresent());
      assertEquals("TopPerKey1", tpk.getName().get());
      assertNotNull(tpk.getKeyExtractor());
      assertNotNull(tpk.getValueExtractor());
      assertNotNull(tpk.getScoreExtractor());
  
      assertTrue(tpk.getWindow().isPresent());
      @SuppressWarnings("unchecked")
      final WindowDesc<?> windowDesc = WindowDesc.of((Window) tpk.getWindow().get());
      assertEquals(windowing, windowDesc.getWindowFn());
      assertEquals(trigger, windowDesc.getTrigger());
      assertEquals(AccumulationMode.DISCARDING_FIRED_PANES, windowDesc.getAccumulationMode());
      assertEquals(Duration.millis(1000), windowDesc.getAllowedLateness());
    }
  
    @Test
    public void testBuild_ImplicitName() {
      final PCollection<String> dataset = TestUtils.createMockDataset(TypeDescriptors.strings());
      final PCollection<Triple<String, Long, Long>> result =
          TopPerKey.of(dataset).keyBy(s -> s).valueBy(s -> 1L).scoreBy(s -> 1L).output();
      final TopPerKey tpk = (TopPerKey) TestUtils.getProducer(result);
      assertFalse(tpk.getName().isPresent());
    }
  
    @Test
    public void testBuild_Windowing() {
      final PCollection<String> dataset = TestUtils.createMockDataset(TypeDescriptors.strings());
      final PCollection<Triple<String, Long, Long>> result =
          TopPerKey.of(dataset)
              .keyBy(s -> s)
              .valueBy(s -> 1L)
              .scoreBy(s -> 1L)
              .windowBy(FixedWindows.of(org.joda.time.Duration.standardHours(1)))
              .triggeredBy(DefaultTrigger.of())
              .accumulationMode(AccumulationMode.DISCARDING_FIRED_PANES)
              .output();
      final TopPerKey tpk = (TopPerKey) TestUtils.getProducer(result);
      assertTrue(tpk.getWindow().isPresent());
      @SuppressWarnings("unchecked")
      final WindowDesc<?> windowDesc = WindowDesc.of((Window) tpk.getWindow().get());
      assertEquals(
          FixedWindows.of(org.joda.time.Duration.standardHours(1)), windowDesc.getWindowFn());
      assertEquals(DefaultTrigger.of(), windowDesc.getTrigger());
      assertEquals(AccumulationMode.DISCARDING_FIRED_PANES, windowDesc.getAccumulationMode());
    }
  
    @Test
    public void testWindow_applyIf() {
      final PCollection<String> dataset = TestUtils.createMockDataset(TypeDescriptors.strings());
      final PCollection<Triple<String, Long, Long>> result =
          TopPerKey.of(dataset)
              .keyBy(s -> s)
              .valueBy(s -> 1L)
              .scoreBy(s -> 1L)
              .applyIf(
                  true,
                  b ->
                      b.windowBy(FixedWindows.of(org.joda.time.Duration.standardHours(1)))
                          .triggeredBy(DefaultTrigger.of())
                          .accumulatingFiredPanes())
              .output();
      final TopPerKey tpk = (TopPerKey) TestUtils.getProducer(result);
      assertTrue(tpk.getWindow().isPresent());
      @SuppressWarnings("unchecked")
      final WindowDesc<?> windowDesc = WindowDesc.of((Window) tpk.getWindow().get());
      assertEquals(
          FixedWindows.of(org.joda.time.Duration.standardHours(1)), windowDesc.getWindowFn());
      assertEquals(DefaultTrigger.of(), windowDesc.getTrigger());
      assertEquals(AccumulationMode.ACCUMULATING_FIRED_PANES, windowDesc.getAccumulationMode());
    }
  }
  