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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.beam.examples.complete.game;
  
  import org.apache.beam.examples.complete.game.StatefulTeamScore.UpdateTeamScoreFn;
  import org.apache.beam.examples.complete.game.UserScore.GameActionInfo;
  import org.apache.beam.sdk.coders.KvCoder;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.sdk.extensions.avro.coders.AvroCoder;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.testing.TestStream;
  import org.apache.beam.sdk.transforms.ParDo;
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.transforms.windowing.GlobalWindow;
  import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
  import org.apache.beam.sdk.transforms.windowing.Window;
  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.Duration;
  import org.joda.time.Instant;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link StatefulTeamScore}. */
  @RunWith(JUnit4.class)
  public class StatefulTeamScoreTest {
  
    private Instant baseTime = new Instant(0);
  
    @Rule public TestPipeline p = TestPipeline.create();
  
    /** Some example users, on two separate teams. */
    private enum TestUser {
      RED_ONE("scarlet", "red"),
      RED_TWO("burgundy", "red"),
      BLUE_ONE("navy", "blue"),
      BLUE_TWO("sky", "blue");
  
      private final String userName;
      private final String teamName;
  
      TestUser(String userName, String teamName) {
        this.userName = userName;
        this.teamName = teamName;
      }
  
      public String getUser() {
        return userName;
      }
  
      public String getTeam() {
        return teamName;
      }
    }
  
    /**
     * Tests that {@link UpdateTeamScoreFn} {@link org.apache.beam.sdk.transforms.DoFn} outputs
     * correctly for one team.
     */
    @Test
    public void testScoreUpdatesOneTeam() {
  
      TestStream<KV<String, GameActionInfo>> createEvents =
          TestStream.create(KvCoder.of(StringUtf8Coder.of(), AvroCoder.of(GameActionInfo.class)))
              .advanceWatermarkTo(baseTime)
              .addElements(
                  event(TestUser.RED_TWO, 99, Duration.standardSeconds(10)),
                  event(TestUser.RED_ONE, 1, Duration.standardSeconds(20)),
                  event(TestUser.RED_ONE, 0, Duration.standardSeconds(30)),
                  event(TestUser.RED_TWO, 100, Duration.standardSeconds(40)),
                  event(TestUser.RED_TWO, 201, Duration.standardSeconds(50)))
              .advanceWatermarkToInfinity();
  
      PCollection<KV<String, Integer>> teamScores =
          p.apply(createEvents).apply(ParDo.of(new UpdateTeamScoreFn(100)));
  
      String redTeam = TestUser.RED_ONE.getTeam();
  
      PAssert.that(teamScores)
          .inWindow(GlobalWindow.INSTANCE)
          .containsInAnyOrder(KV.of(redTeam, 100), KV.of(redTeam, 200), KV.of(redTeam, 401));
  
      p.run().waitUntilFinish();
    }
  
    /**
     * Tests that {@link UpdateTeamScoreFn} {@link org.apache.beam.sdk.transforms.DoFn} outputs
     * correctly for multiple teams.
     */
    @Test
    public void testScoreUpdatesPerTeam() {
  
      TestStream<KV<String, GameActionInfo>> createEvents =
          TestStream.create(KvCoder.of(StringUtf8Coder.of(), AvroCoder.of(GameActionInfo.class)))
              .advanceWatermarkTo(baseTime)
              .addElements(
                  event(TestUser.RED_ONE, 50, Duration.standardSeconds(10)),
                  event(TestUser.RED_TWO, 50, Duration.standardSeconds(20)),
                  event(TestUser.BLUE_ONE, 70, Duration.standardSeconds(30)),
                  event(TestUser.BLUE_TWO, 80, Duration.standardSeconds(40)),
                  event(TestUser.BLUE_TWO, 50, Duration.standardSeconds(50)))
              .advanceWatermarkToInfinity();
  
      PCollection<KV<String, Integer>> teamScores =
          p.apply(createEvents).apply(ParDo.of(new UpdateTeamScoreFn(100)));
  
      String redTeam = TestUser.RED_ONE.getTeam();
      String blueTeam = TestUser.BLUE_ONE.getTeam();
  
      PAssert.that(teamScores)
          .inWindow(GlobalWindow.INSTANCE)
          .containsInAnyOrder(KV.of(redTeam, 100), KV.of(blueTeam, 150), KV.of(blueTeam, 200));
  
      p.run().waitUntilFinish();
    }
  
    /**
     * Tests that {@link UpdateTeamScoreFn} {@link org.apache.beam.sdk.transforms.DoFn} outputs
     * correctly per window and per key.
     */
    @Test
    public void testScoreUpdatesPerWindow() {
  
      TestStream<KV<String, GameActionInfo>> createEvents =
          TestStream.create(KvCoder.of(StringUtf8Coder.of(), AvroCoder.of(GameActionInfo.class)))
              .advanceWatermarkTo(baseTime)
              .addElements(
                  event(TestUser.RED_ONE, 50, Duration.standardMinutes(1)),
                  event(TestUser.RED_TWO, 50, Duration.standardMinutes(2)),
                  event(TestUser.RED_ONE, 50, Duration.standardMinutes(3)),
                  event(TestUser.RED_ONE, 60, Duration.standardMinutes(6)),
                  event(TestUser.RED_TWO, 60, Duration.standardMinutes(7)))
              .advanceWatermarkToInfinity();
  
      Duration teamWindowDuration = Duration.standardMinutes(5);
  
      PCollection<KV<String, Integer>> teamScores =
          p.apply(createEvents)
              .apply(Window.<KV<String, GameActionInfo>>into(FixedWindows.of(teamWindowDuration)))
              .apply(ParDo.of(new UpdateTeamScoreFn(100)));
  
      String redTeam = TestUser.RED_ONE.getTeam();
  
      IntervalWindow window1 = new IntervalWindow(baseTime, teamWindowDuration);
      IntervalWindow window2 = new IntervalWindow(window1.end(), teamWindowDuration);
  
      PAssert.that(teamScores).inWindow(window1).containsInAnyOrder(KV.of(redTeam, 100));
  
      PAssert.that(teamScores).inWindow(window2).containsInAnyOrder(KV.of(redTeam, 120));
  
      p.run().waitUntilFinish();
    }
  
    private TimestampedValue<KV<String, GameActionInfo>> event(
        TestUser user, int score, Duration baseTimeOffset) {
      return TimestampedValue.of(
          KV.of(
              user.getTeam(),
              new GameActionInfo(
                  user.getUser(), user.getTeam(), score, baseTime.plus(baseTimeOffset).getMillis())),
          baseTime.plus(baseTimeOffset));
    }
  }
  