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.extensions.euphoria.core.testkit;
  
  import java.util.Arrays;
  import java.util.List;
  import java.util.UUID;
  import org.apache.beam.sdk.Pipeline;
  import org.apache.beam.sdk.extensions.euphoria.core.client.operator.Union;
  import org.apache.beam.sdk.transforms.Create;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.TypeDescriptors;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Test for operator {@code Union}. */
  @RunWith(JUnit4.class)
  public class UnionTest extends AbstractOperatorTest {
  
    private static PCollection<Integer> createDataset(Pipeline pipeline, Integer... data) {
      return pipeline
          .apply("create-" + UUID.randomUUID(), Create.of(Arrays.asList(data)))
          .setTypeDescriptor(TypeDescriptors.integers());
    }
  
    @Test
    public void testUnion() {
      execute(
          new TestCase<Integer>() {
  
            @Override
            public PCollection<Integer> getOutput(Pipeline pipeline) {
              final PCollection<Integer> first = createDataset(pipeline, 1, 2, 3, 4, 5, 6);
              final PCollection<Integer> second = createDataset(pipeline, 7, 8, 9, 10, 11, 12);
              return Union.of(first, second).output();
            }
  
            @Override
            public List<Integer> getUnorderedOutput() {
              return Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);
            }
          });
    }
  
    @Test
    public void testUnion_threeDataSets() {
      execute(
          new TestCase<Integer>() {
  
            @Override
            public PCollection<Integer> getOutput(Pipeline pipeline) {
              final PCollection<Integer> first = createDataset(pipeline, 1, 2, 3, 4, 5, 6);
              final PCollection<Integer> second = createDataset(pipeline, 7, 8, 9, 10, 11, 12);
              final PCollection<Integer> third = createDataset(pipeline, 13, 14, 15, 16, 17, 18);
              return Union.of(first, second, third).output();
            }
  
            @Override
            public List<Integer> getUnorderedOutput() {
              return Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18);
            }
          });
    }
  
    @Test
    public void testUnion_fiveDataSets() {
      execute(
          new TestCase<Integer>() {
  
            @Override
            public PCollection<Integer> getOutput(Pipeline pipeline) {
              final PCollection<Integer> first = createDataset(pipeline, 1, 2, 3);
              final PCollection<Integer> second = createDataset(pipeline, 4, 5, 6);
              final PCollection<Integer> third = createDataset(pipeline, 7, 8, 9);
              final PCollection<Integer> fourth = createDataset(pipeline, 10, 11, 12);
              final PCollection<Integer> fifth = createDataset(pipeline, 13, 14, 15);
              return Union.of(first, second, third, fourth, fifth).output();
            }
  
            @Override
            public List<Integer> getUnorderedOutput() {
              return Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
            }
          });
    }
  }
  