learning/katas/java/Core Transforms/CoGroupByKey/CoGroupByKey/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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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 coGroupByKey() {
    PCollection<String> fruits =
        testPipeline.apply("Fruits",
            Create.of("apple", "banana", "cherry")
        );

    PCollection<String> countries =
        testPipeline.apply("Countries",
            Create.of("australia", "brazil", "canada")
        );

    PCollection<String> results = Task.applyTransform(fruits, countries);

    PAssert.that(results)
        .containsInAnyOrder(
            "WordsAlphabet{alphabet='a', fruit='apple', country='australia'}",
            "WordsAlphabet{alphabet='b', fruit='banana', country='brazil'}",
            "WordsAlphabet{alphabet='c', fruit='cherry', country='canada'}"
        );

    testPipeline.run().waitUntilFinish();
  }

}