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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
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  package org.apache.beam.runners.flink.translation.types;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.io.IOException;
  import org.apache.beam.runners.core.construction.SerializablePipelineOptions;
  import org.apache.beam.sdk.coders.VarIntCoder;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.flink.api.common.typeutils.TypeSerializerSnapshot;
  import org.apache.flink.core.memory.DataInputDeserializer;
  import org.apache.flink.core.memory.DataOutputSerializer;
  import org.junit.Test;
  
  public class UnversionedTypeSerializerSnapshotTest {
  
    @Test
    public void testSerialization() throws IOException {
      PipelineOptions opts = PipelineOptionsFactory.create();
      CoderTypeSerializer<Integer> serializer =
          new CoderTypeSerializer<>(VarIntCoder.of(), new SerializablePipelineOptions(opts));
      TypeSerializerSnapshot<Integer> snapshot = serializer.snapshotConfiguration();
      assertTrue(snapshot instanceof UnversionedTypeSerializerSnapshot);
      assertEquals(1, snapshot.getCurrentVersion());
      DataOutputSerializer output = new DataOutputSerializer(1);
      snapshot.writeSnapshot(output);
      DataInputDeserializer input = new DataInputDeserializer();
      input.setBuffer(output.wrapAsByteBuffer());
      TypeSerializerSnapshot<Integer> emptySnapshot = new UnversionedTypeSerializerSnapshot<>();
      emptySnapshot.readSnapshot(
          snapshot.getCurrentVersion(), input, Thread.currentThread().getContextClassLoader());
      assertEquals(emptySnapshot.restoreSerializer(), serializer);
    }
  }
  