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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.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.is;
  
  import org.apache.beam.runners.core.triggers.TriggerStateMachineTester.SimpleTriggerStateMachineTester;
  import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
  import org.apache.beam.sdk.transforms.windowing.FixedWindows;
  import org.apache.beam.sdk.transforms.windowing.IntervalWindow;
  import org.apache.beam.sdk.values.TimestampedValue;
  import org.joda.time.Duration;
  import org.joda.time.Instant;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link NeverStateMachine}. */
  @RunWith(JUnit4.class)
  public class NeverStateMachineTest {
    private SimpleTriggerStateMachineTester<IntervalWindow> triggerTester;
  
    @Before
    public void setup() throws Exception {
      triggerTester =
          TriggerStateMachineTester.forTrigger(
              NeverStateMachine.ever(), FixedWindows.of(Duration.standardMinutes(5)));
    }
  
    @Test
    public void falseAfterEndOfWindow() throws Exception {
      triggerTester.injectElements(TimestampedValue.of(1, new Instant(1)));
      IntervalWindow window =
          new IntervalWindow(new Instant(0), new Instant(0).plus(Duration.standardMinutes(5)));
      assertThat(triggerTester.shouldFire(window), is(false));
      triggerTester.advanceInputWatermark(BoundedWindow.TIMESTAMP_MAX_VALUE);
      assertThat(triggerTester.shouldFire(window), is(false));
    }
  }
  