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.sdk.transforms;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import org.apache.beam.sdk.coders.IterableCoder;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  import org.apache.beam.sdk.testing.NeedsRunner;
  import org.apache.beam.sdk.testing.PAssert;
  import org.apache.beam.sdk.testing.TestPipeline;
  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.experimental.categories.Category;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link ToString} transform. */
  @RunWith(JUnit4.class)
  public class ToStringTest {
    @Rule public final TestPipeline p = TestPipeline.create();
  
    @Test
    @Category(NeedsRunner.class)
    public void testToStringOf() {
      Integer[] ints = {1, 2, 3, 4, 5};
      String[] strings = {"1", "2", "3", "4", "5"};
      PCollection<Integer> input = p.apply(Create.of(Arrays.asList(ints)));
      PCollection<String> output = input.apply(ToString.elements());
      PAssert.that(output).containsInAnyOrder(strings);
      p.run();
    }
  
    @Test
    @Category(NeedsRunner.class)
    public void testToStringKV() {
      ArrayList<KV<String, Integer>> kvs = new ArrayList<>();
      kvs.add(KV.of("one", 1));
      kvs.add(KV.of("two", 2));
  
      ArrayList<String> expected = new ArrayList<>();
      expected.add("one,1");
      expected.add("two,2");
  
      PCollection<KV<String, Integer>> input = p.apply(Create.of(kvs));
      PCollection<String> output = input.apply(ToString.kvs());
      PAssert.that(output).containsInAnyOrder(expected);
      p.run();
    }
  
    @Test
    @Category(NeedsRunner.class)
    public void testToStringKVWithDelimiter() {
      ArrayList<KV<String, Integer>> kvs = new ArrayList<>();
      kvs.add(KV.of("one", 1));
      kvs.add(KV.of("two", 2));
  
      ArrayList<String> expected = new ArrayList<>();
      expected.add("one\t1");
      expected.add("two\t2");
  
      PCollection<KV<String, Integer>> input = p.apply(Create.of(kvs));
      PCollection<String> output = input.apply(ToString.kvs("\t"));
      PAssert.that(output).containsInAnyOrder(expected);
      p.run();
    }
  
    @Test
    @Category(NeedsRunner.class)
    public void testToStringIterable() {
      ArrayList<Iterable<String>> iterables = new ArrayList<>();
      iterables.add(Arrays.asList(new String[] {"one", "two", "three"}));
      iterables.add(Arrays.asList(new String[] {"four", "five", "six"}));
  
      ArrayList<String> expected = new ArrayList<>();
      expected.add("one,two,three");
      expected.add("four,five,six");
  
      PCollection<Iterable<String>> input =
          p.apply(Create.of(iterables).withCoder(IterableCoder.of(StringUtf8Coder.of())));
      PCollection<String> output = input.apply(ToString.iterables());
      PAssert.that(output).containsInAnyOrder(expected);
      p.run();
    }
  
    @Test
    @Category(NeedsRunner.class)
    public void testToStringIterableWithDelimiter() {
      ArrayList<Iterable<String>> iterables = new ArrayList<>();
      iterables.add(Arrays.asList(new String[] {"one", "two", "three"}));
      iterables.add(Arrays.asList(new String[] {"four", "five", "six"}));
  
      ArrayList<String> expected = new ArrayList<>();
      expected.add("one\ttwo\tthree");
      expected.add("four\tfive\tsix");
  
      PCollection<Iterable<String>> input =
          p.apply(Create.of(iterables).withCoder(IterableCoder.of(StringUtf8Coder.of())));
      PCollection<String> output = input.apply(ToString.iterables("\t"));
      PAssert.that(output).containsInAnyOrder(expected);
      p.run();
    }
  }
  