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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.sdk.transforms.windowing;
  
  import static org.junit.Assert.assertEquals;
  
  import org.apache.beam.sdk.coders.Coder.Context;
  import org.apache.beam.sdk.testing.CoderProperties;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.io.ByteStreams;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.io.CountingOutputStream;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link GlobalWindow}. */
  @RunWith(JUnit4.class)
  public class GlobalWindowTest {
    @Test
    public void testCoderBinaryRepresentation() throws Exception {
      CountingOutputStream out = new CountingOutputStream(ByteStreams.nullOutputStream());
      GlobalWindow.Coder.INSTANCE.encode(GlobalWindow.INSTANCE, out, Context.OUTER);
      assertEquals(0, out.getCount());
      GlobalWindow.Coder.INSTANCE.encode(GlobalWindow.INSTANCE, out);
      assertEquals(0, out.getCount());
    }
  
    @Test
    public void testCoderEncodeDecodeEquals() throws Exception {
      CoderProperties.coderDecodeEncodeEqual(GlobalWindow.Coder.INSTANCE, GlobalWindow.INSTANCE);
    }
  
    @Test
    public void testCoderIsSerializable() {
      CoderProperties.coderSerializable(GlobalWindow.Coder.INSTANCE);
    }
  
    @Test
    public void testCoderIsDeterministic() throws Exception {
      CoderProperties.coderDeterministic(
          GlobalWindow.Coder.INSTANCE, GlobalWindow.INSTANCE, GlobalWindow.INSTANCE);
    }
  }
  