content: /*
   * 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.testing;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNull;
  
  import java.util.List;
  import java.util.Set;
  import org.apache.beam.sdk.io.BoundedSource;
  import org.apache.beam.sdk.io.BoundedSource.BoundedReader;
  import org.apache.beam.sdk.io.CountingSource;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Sets;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link SourceTestUtils}. */
  @RunWith(JUnit4.class)
  public class SourceTestUtilsTest {
  
    @Test
    public void testToUnsplittableSource() throws Exception {
      PipelineOptions options = PipelineOptionsFactory.create();
      BoundedSource<Long> baseSource = CountingSource.upTo(100);
      BoundedSource<Long> unsplittableSource = SourceTestUtils.toUnsplittableSource(baseSource);
      List<?> splits = unsplittableSource.split(1, options);
      assertEquals(1, splits.size());
      assertEquals(unsplittableSource, splits.get(0));
  
      BoundedReader<Long> unsplittableReader = unsplittableSource.createReader(options);
      assertEquals(0, unsplittableReader.getFractionConsumed(), 1e-15);
  
      Set<Long> expected = Sets.newHashSet(SourceTestUtils.readFromSource(baseSource, options));
      Set<Long> actual = Sets.newHashSet();
      actual.addAll(SourceTestUtils.readNItemsFromUnstartedReader(unsplittableReader, 40));
      assertNull(unsplittableReader.splitAtFraction(0.5));
      actual.addAll(SourceTestUtils.readRemainingFromReader(unsplittableReader, true /* started */));
      assertEquals(1, unsplittableReader.getFractionConsumed(), 1e-15);
  
      assertEquals(100, actual.size());
      assertEquals(Sets.newHashSet(expected), Sets.newHashSet(actual));
    }
  }
  