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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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   * See the License for the specific language governing permissions and
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  package org.apache.beam.sdk.extensions.ml;
  
  import static org.junit.Assert.assertEquals;
  
  import com.google.privacy.dlp.v2.Table;
  import java.util.ArrayList;
  import java.util.List;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.ParDo;
  import org.apache.beam.sdk.transforms.SerializableFunction;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PCollection;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  @RunWith(JUnit4.class)
  public class BatchRequestForDlpTest {
  
    @Rule public TestPipeline testPipeline = TestPipeline.create();
  
    @Test
    public void batchesRequests() {
      PCollection<KV<String, Iterable<Table.Row>>> batchedRows =
          testPipeline
              .apply(Create.of(KV.of("key", "value1"), KV.of("key", "value2")))
              .apply(ParDo.of(new MapStringToDlpRow(null)))
              .apply(ParDo.of(new BatchRequestForDLP(524000)));
      PAssert.that(batchedRows).satisfies(new VerifyPCollectionSize());
      testPipeline.run().waitUntilFinish();
    }
  
    private static class VerifyPCollectionSize
        implements SerializableFunction<Iterable<KV<String, Iterable<Table.Row>>>, Void> {
      @Override
      public Void apply(Iterable<KV<String, Iterable<Table.Row>>> input) {
        List<KV<String, Iterable<Table.Row>>> itemList = new ArrayList<>();
        input.forEach(itemList::add);
        assertEquals(1, itemList.size());
        return null;
      }
    }
  }
  