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
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.beam.runners.spark.io;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Set;
  import org.apache.beam.runners.spark.examples.WordCount;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.sdk.io.TextIO;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.transforms.MapElements;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.Sets;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.io.Files;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.TemporaryFolder;
  
  /** Number of shards test. */
  public class NumShardsTest {
  
    private static final String[] WORDS_ARRAY = {
      "hi there", "hi", "hi sue bob",
      "hi sue", "", "bob hi"
    };
    private static final List<String> WORDS = Arrays.asList(WORDS_ARRAY);
  
    private File outputDir;
  
    @Rule public final TemporaryFolder tmpDir = new TemporaryFolder();
  
    @Rule public final TestPipeline p = TestPipeline.create();
  
    @Before
    public void setUp() throws IOException {
      outputDir = tmpDir.newFolder("out");
      outputDir.delete();
    }
  
    @Test
    public void testText() throws Exception {
      PCollection<String> inputWords = p.apply(Create.of(WORDS).withCoder(StringUtf8Coder.of()));
      PCollection<String> output =
          inputWords
              .apply(new WordCount.CountWords())
              .apply(MapElements.via(new WordCount.FormatAsTextFn()));
      output.apply(
          TextIO.write().to(outputDir.getAbsolutePath()).withNumShards(3).withSuffix(".txt"));
      p.run().waitUntilFinish();
  
      int count = 0;
      Set<String> expected = Sets.newHashSet("hi: 5", "there: 1", "sue: 2", "bob: 2");
      for (File f :
          tmpDir.getRoot().listFiles(pathname -> pathname.getName().matches("out-.*\\.txt"))) {
        count++;
        for (String line : Files.readLines(f, StandardCharsets.UTF_8)) {
          assertTrue(line + " not found", expected.remove(line));
        }
      }
      assertEquals(3, count);
      assertTrue(expected.toString(), expected.isEmpty());
    }
  }
  