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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,
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   * See the License for the specific language governing permissions and
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  package org.apache.beam.runners.core.triggers;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
  import org.joda.time.Duration;
  import org.joda.time.Instant;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link ReshuffleTriggerStateMachine}. */
  @RunWith(JUnit4.class)
  public class ReshuffleTriggerStateMachineTest {
  
    /** Public so that other tests can instantiate {@link ReshuffleTriggerStateMachine}. */
    public static ReshuffleTriggerStateMachine forTest() {
      return ReshuffleTriggerStateMachine.create();
    }
  
    @Test
    public void testShouldFire() throws Exception {
      TriggerStateMachineTester<Integer, IntervalWindow> tester =
          TriggerStateMachineTester.forTrigger(
              ReshuffleTriggerStateMachine.create(), FixedWindows.of(Duration.millis(100)));
      IntervalWindow arbitraryWindow = new IntervalWindow(new Instant(300), new Instant(400));
      assertTrue(tester.shouldFire(arbitraryWindow));
    }
  
    @Test
    public void testOnTimer() throws Exception {
      TriggerStateMachineTester<Integer, IntervalWindow> tester =
          TriggerStateMachineTester.forTrigger(
              ReshuffleTriggerStateMachine.create(), FixedWindows.of(Duration.millis(100)));
      IntervalWindow arbitraryWindow = new IntervalWindow(new Instant(100), new Instant(200));
      tester.fireIfShouldFire(arbitraryWindow);
      assertFalse(tester.isMarkedFinished(arbitraryWindow));
    }
  
    @Test
    public void testToString() {
      TriggerStateMachine trigger = ReshuffleTriggerStateMachine.create();
      assertEquals("ReshuffleTriggerStateMachine()", trigger.toString());
    }
  }
  