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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.nexmark.sources;
  
  import org.apache.beam.sdk.nexmark.NexmarkConfiguration;
  import org.apache.beam.sdk.nexmark.NexmarkOptions;
  import org.apache.beam.sdk.nexmark.sources.generator.GeneratorConfig;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.beam.sdk.testing.SourceTestUtils;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Test {@link BoundedEventSource}. */
  @RunWith(JUnit4.class)
  public class BoundedEventSourceTest {
    private GeneratorConfig makeConfig(long n) {
      return new GeneratorConfig(NexmarkConfiguration.DEFAULT, System.currentTimeMillis(), 0, n, 0);
    }
  
    @Test
    public void sourceAndReadersWork() throws Exception {
      NexmarkOptions options = PipelineOptionsFactory.as(NexmarkOptions.class);
      long n = 200L;
      BoundedEventSource source = new BoundedEventSource(makeConfig(n), 1);
  
      SourceTestUtils.assertUnstartedReaderReadsSameAsItsSource(
          source.createReader(options), options);
    }
  
    @Test
    public void splitAtFractionRespectsContract() throws Exception {
      NexmarkOptions options = PipelineOptionsFactory.as(NexmarkOptions.class);
      long n = 20L;
      BoundedEventSource source = new BoundedEventSource(makeConfig(n), 1);
  
      // Can't split if already consumed.
      SourceTestUtils.assertSplitAtFractionFails(source, 10, 0.3, options);
  
      SourceTestUtils.assertSplitAtFractionSucceedsAndConsistent(source, 5, 0.3, options);
  
      SourceTestUtils.assertSplitAtFractionExhaustive(source, options);
    }
  
    @Test
    public void splitIntoBundlesRespectsContract() throws Exception {
      NexmarkOptions options = PipelineOptionsFactory.as(NexmarkOptions.class);
      long n = 200L;
      BoundedEventSource source = new BoundedEventSource(makeConfig(n), 1);
      SourceTestUtils.assertSourcesEqualReferenceSource(source, source.split(10, options), options);
    }
  }
  