learning/katas/java/Core Transforms/Flatten/Flatten/test/TaskTest.java

/*
 *  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
 *
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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 *  See the License for the specific language governing permissions and
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import org.apache.beam.sdk.testing.PAssert;
import org.apache.beam.sdk.testing.TestPipeline;
import org.apache.beam.sdk.transforms.Create;
import org.apache.beam.sdk.values.PCollection;
import org.junit.Rule;
import org.junit.Test;

public class TaskTest {

  @Rule
  public TestPipeline testPipeline = TestPipeline.create();

  @Test
  public void flatten() {
    PCollection<String> wordsStartingWithA =
        testPipeline.apply("Words starting with A",
            Create.of("apple", "ant", "arrow"));
    PCollection<String> wordsStartingWithB =
        testPipeline.apply("Words starting with B",
            Create.of("ball", "book", "bow"));

    PCollection<String> results = Task.applyTransform(wordsStartingWithA, wordsStartingWithB);

    PAssert.that(results)
        .containsInAnyOrder("apple", "ant", "arrow", "ball", "book", "bow");

    testPipeline.run().waitUntilFinish();
  }

}