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,
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   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.beam.learning.katas.commontransforms.withkeys;
  
  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.KV;
  import org.apache.beam.sdk.values.PCollection;
  import org.junit.Rule;
  import org.junit.Test;
  
  public class TaskTest {
  
    @Rule
    public final transient TestPipeline testPipeline = TestPipeline.create();
  
    @SuppressWarnings("unchecked")
    @Test
    public void groupByKey() {
      PCollection<String> numbers =
          testPipeline.apply(
              Create.of("apple", "banana", "cherry", "durian", "guava", "melon")
          );
  
      PCollection<KV<String, String>> results = Task.applyTransform(numbers);
  
      PAssert.that(results)
          .containsInAnyOrder(
              KV.of("a", "apple"),
              KV.of("b", "banana"),
              KV.of("c", "cherry"),
              KV.of("d", "durian"),
              KV.of("g", "guava"),
              KV.of("m", "melon")
          );
  
      testPipeline.run().waitUntilFinish();
    }
  
  }