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   * 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
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  package org.apache.beam.sdk.extensions.ml;
  
  import com.google.cloud.vision.v1.AnnotateImageResponse;
  import com.google.cloud.vision.v1.Feature;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.function.Consumer;
  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;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  @RunWith(JUnit4.class)
  public class CloudVisionIT {
    @Rule public TestPipeline testPipeline = TestPipeline.create();
    private static final String TEST_IMAGE_URI = "gs://cloud-samples-data/vision/label/setagaya.jpeg";
    private static final String EXPECTED_LABEL = "Street";
    private List<Feature> features =
        Collections.singletonList(Feature.newBuilder().setType(Feature.Type.LABEL_DETECTION).build());
    private static final int NUMBER_OF_KEYS = 1;
  
    @Test
    public void annotateImageFromURINoContext() {
      PCollection<List<AnnotateImageResponse>> annotationResponses =
          testPipeline
              .apply(Create.of(TEST_IMAGE_URI))
              .apply(CloudVision.annotateImagesFromGcsUri(null, features, 1, NUMBER_OF_KEYS));
  
      PAssert.that(annotationResponses).satisfies(new VerifyImageAnnotationResult());
  
      testPipeline.run().waitUntilFinish();
    }
  
    private static class VerifyImageAnnotationResult
        implements org.apache.beam.sdk.transforms.SerializableFunction<
            Iterable<List<AnnotateImageResponse>>, Void> {
      @Override
      public Void apply(Iterable<List<AnnotateImageResponse>> input) {
        List<Boolean> labelMatches = new ArrayList<>();
        input.forEach(findStringMatchesInAnnotationResponse(labelMatches, EXPECTED_LABEL));
        return null;
      }
  
      private Consumer<? super List<AnnotateImageResponse>> findStringMatchesInAnnotationResponse(
          List<Boolean> labelMatches, String expectedLabel) {
        return annotateImageResponses -> {
          labelMatches.add(
              annotateImageResponses.stream()
                  .anyMatch(result -> entityWithDescriptionFoundInResult(expectedLabel, result)));
        };
      }
  
      private boolean entityWithDescriptionFoundInResult(
          String expectedLabel, AnnotateImageResponse result) {
        return result.getLabelAnnotationsList().stream()
            .anyMatch(labelAnnotation -> labelAnnotation.getDescription().equals(expectedLabel));
      }
    }
  }
  