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.client.operator;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import org.apache.beam.sdk.testing.TestPipeline;
  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 behavior of operator {@code Union}. */
  @RunWith(JUnit4.class)
  @SuppressWarnings({
    "rawtypes" // TODO(https://github.com/apache/beam/issues/20447)
  })
  public class UnionTest {
  
    @Test
    public void testBuild() {
      final TestPipeline pipeline = TestUtils.createTestPipeline();
      final PCollection<String> left =
          TestUtils.createMockDataset(pipeline, TypeDescriptors.strings());
      final PCollection<String> right =
          TestUtils.createMockDataset(pipeline, TypeDescriptors.strings());
  
      final PCollection<String> unioned = Union.named("Union1").of(left, right).output();
  
      final Union union = (Union) TestUtils.getProducer(unioned);
      assertTrue(union.getName().isPresent());
      assertEquals("Union1", union.getName().get());
    }
  
    @Test(expected = IllegalArgumentException.class)
    public void testBuild_OneDataSet() {
      final PCollection<String> first = TestUtils.createMockDataset(TypeDescriptors.strings());
      Union.named("Union1").of(first).output();
    }
  
    @Test
    public void testBuild_ThreeDataSet() {
      final TestPipeline pipeline = TestUtils.createTestPipeline();
      final PCollection<String> first =
          TestUtils.createMockDataset(pipeline, TypeDescriptors.strings());
      final PCollection<String> second =
          TestUtils.createMockDataset(pipeline, TypeDescriptors.strings());
      final PCollection<String> third =
          TestUtils.createMockDataset(pipeline, TypeDescriptors.strings());
  
      final PCollection<String> unioned = Union.named("Union1").of(first, second, third).output();
  
      final Union union = (Union) TestUtils.getProducer(unioned);
      assertTrue(union.getName().isPresent());
      assertEquals("Union1", union.getName().get());
    }
  
    @Test
    public void testBuild_ImplicitName() {
      final TestPipeline pipeline = TestUtils.createTestPipeline();
      final PCollection<String> left =
          TestUtils.createMockDataset(pipeline, TypeDescriptors.strings());
      final PCollection<String> right =
          TestUtils.createMockDataset(pipeline, TypeDescriptors.strings());
      final PCollection<String> unioned = Union.of(left, right).output();
      final Union union = (Union) TestUtils.getProducer(unioned);
      assertFalse(union.getName().isPresent());
    }
  }
  