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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
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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
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   * Unless required by applicable law or agreed to in writing, software
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  package org.apache.beam.examples.cookbook;
  
  import static org.apache.beam.sdk.testing.FileChecksumMatcher.fileContentsHaveChecksum;
  import static org.hamcrest.MatcherAssert.assertThat;
  
  import java.util.Date;
  import java.util.regex.Pattern;
  import org.apache.beam.sdk.io.FileSystems;
  import org.apache.beam.sdk.io.fs.ResolveOptions;
  import org.apache.beam.sdk.options.PipelineOptionsFactory;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.testing.TestPipelineOptions;
  import org.apache.beam.sdk.util.NumberedShardedFile;
  import org.junit.BeforeClass;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** An end-to-end test for {@link org.apache.beam.examples.cookbook.JoinExamples}. */
  @RunWith(JUnit4.class)
  public class JoinExamplesIT {
    private static final String EXPECTED_OUTPUT_CHECKSUM = "22394366a77255b6941ec747794df4f51f73c07d";
    private static final Pattern DEFAULT_SHARD_TEMPLATE =
        Pattern.compile("(?x) \\S* (?<shardnum> \\d+) -of- (?<numshards> \\d+)");
  
    /** Options for the JoinExamples Integration Test. */
    public interface JoinExamplesOptions extends TestPipelineOptions, JoinExamples.Options {}
  
    @BeforeClass
    public static void setUp() {
      PipelineOptionsFactory.register(TestPipelineOptions.class);
    }
  
    @Test
    public void testE2EJoinExamples() throws Exception {
      JoinExamplesIT.JoinExamplesOptions options =
          TestPipeline.testingPipelineOptions().as(JoinExamplesIT.JoinExamplesOptions.class);
      options.setOutput(
          FileSystems.matchNewResource(options.getTempRoot(), true)
              .resolve(
                  String.format("JoinExamples-%tF-%<tH-%<tM-%<tS-%<tL", new Date()),
                  ResolveOptions.StandardResolveOptions.RESOLVE_DIRECTORY)
              .resolve("output", ResolveOptions.StandardResolveOptions.RESOLVE_DIRECTORY)
              .resolve("results", ResolveOptions.StandardResolveOptions.RESOLVE_FILE)
              .toString());
      JoinExamples.runJoinExamples(options);
  
      assertThat(
          new NumberedShardedFile(options.getOutput() + "*-of-*", DEFAULT_SHARD_TEMPLATE),
          fileContentsHaveChecksum(EXPECTED_OUTPUT_CHECKSUM));
    }
  }
  