learning/katas/java/Common Transforms/WithKeys/WithKeys/test/org/apache/beam/learning/katas/commontransforms/withkeys/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
 *
 * 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.
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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();
  }

}