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.examples.complete;
  
  import java.net.URI;
  import java.util.Arrays;
  import org.apache.beam.sdk.coders.StringDelegateCoder;
  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.transforms.Distinct;
  import org.apache.beam.sdk.transforms.Keys;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PCollection;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests of {@link TfIdf}. */
  @RunWith(JUnit4.class)
  public class TfIdfTest {
  
    @Rule public TestPipeline pipeline = TestPipeline.create();
  
    /** Test that the example runs. */
    @Test
    public void testTfIdf() throws Exception {
  
      pipeline.getCoderRegistry().registerCoderForClass(URI.class, StringDelegateCoder.of(URI.class));
  
      PCollection<KV<String, KV<URI, Double>>> wordToUriAndTfIdf =
          pipeline
              .apply(
                  Create.of(
                      KV.of(new URI("x"), "a b c d"),
                      KV.of(new URI("y"), "a b c"),
                      KV.of(new URI("z"), "a m n")))
              .apply(new TfIdf.ComputeTfIdf());
  
      PCollection<String> words = wordToUriAndTfIdf.apply(Keys.create()).apply(Distinct.create());
  
      PAssert.that(words).containsInAnyOrder(Arrays.asList("a", "m", "n", "b", "c", "d"));
  
      pipeline.run().waitUntilFinish();
    }
  }
  