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.twitterstreamgenerator;
  
  import static org.junit.Assert.assertArrayEquals;
  import static org.mockito.Mockito.when;
  
  import com.fasterxml.jackson.core.JsonProcessingException;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Date;
  import java.util.List;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.stream.IntStream;
  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.ParDo;
  import org.apache.beam.sdk.values.PCollection;
  import org.junit.Before;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  import org.mockito.Mock;
  import org.mockito.MockitoAnnotations;
  import twitter4j.Status;
  
  @RunWith(JUnit4.class)
  public class ReadFromTwitterDoFnTest {
    @Rule public final transient TestPipeline pipeline = TestPipeline.create();
    @Rule public final ExpectedException expectedException = ExpectedException.none();
    @Mock TwitterConnection twitterConnection1;
    @Mock TwitterConnection twitterConnection2;
    @Mock Status status1;
    @Mock Status status2;
    @Mock Status status3;
    @Mock Status status4;
    @Mock Status status5;
    LinkedBlockingQueue<Status> queue1 = new LinkedBlockingQueue<>();
    LinkedBlockingQueue<Status> queue2 = new LinkedBlockingQueue<>();
  
    @Before
    public void setUp() throws JsonProcessingException {
      MockitoAnnotations.initMocks(this);
      when(status1.getText()).thenReturn("Breaking News1");
      when(status1.getCreatedAt()).thenReturn(new Date());
      when(status2.getText()).thenReturn("Breaking News2");
      when(status2.getCreatedAt()).thenReturn(new Date());
      when(status3.getText()).thenReturn("Breaking News3");
      when(status3.getCreatedAt()).thenReturn(new Date());
      when(status4.getText()).thenReturn("Breaking News4");
      when(status4.getCreatedAt()).thenReturn(new Date());
      when(status5.getText()).thenReturn("Breaking News5");
      when(status5.getCreatedAt()).thenReturn(new Date());
      queue1.offer(status1);
      queue1.offer(status2);
      queue1.offer(status3);
      queue2.offer(status4);
      queue2.offer(status5);
    }
  
    @Test
    public void testTwitterRead() {
      TwitterConfig twitterConfig = new TwitterConfig.Builder().setTweetsCount(3L).build();
      TwitterConnection.INSTANCE_MAP.put(twitterConfig, twitterConnection1);
      when(twitterConnection1.getQueue()).thenReturn(queue1);
      PCollection<String> result =
          pipeline
              .apply("Create Twitter Connection Configuration", Create.of(twitterConfig))
              .apply(ParDo.of(new ReadFromTwitterDoFn()));
      PAssert.that(result)
          .satisfies(
              pcollection -> {
                List<String> output = new ArrayList<>();
                pcollection.forEach(output::add);
                String[] expected = {"Breaking News1", "Breaking News2", "Breaking News3"};
                String[] actual = new String[output.size()];
                IntStream.range(0, output.size()).forEach((i) -> actual[i] = output.get(i));
                assertArrayEquals("Mismatch found in output", actual, expected);
                return null;
              });
      pipeline.run();
    }
  
    @Test
    public void testMultipleTwitterConfigs() {
      TwitterConfig twitterConfig1 = new TwitterConfig.Builder().setTweetsCount(3L).build();
      TwitterConfig twitterConfig2 = new TwitterConfig.Builder().setTweetsCount(2L).build();
      TwitterConnection.INSTANCE_MAP.put(twitterConfig1, twitterConnection1);
      TwitterConnection.INSTANCE_MAP.put(twitterConfig2, twitterConnection2);
      when(twitterConnection1.getQueue()).thenReturn(queue1);
      when(twitterConnection2.getQueue()).thenReturn(queue2);
      PCollection<String> result =
          pipeline
              .apply(
                  "Create Twitter Connection Configuration",
                  Create.of(twitterConfig1, twitterConfig2))
              .apply(ParDo.of(new ReadFromTwitterDoFn()));
      PAssert.that(result)
          .satisfies(
              pcollection -> {
                List<String> output = new ArrayList<>();
                pcollection.forEach(output::add);
                String[] expected = {
                  "Breaking News1",
                  "Breaking News2",
                  "Breaking News3",
                  "Breaking News4",
                  "Breaking News5"
                };
                String[] actual = new String[output.size()];
                Collections.sort(output);
                IntStream.range(0, output.size()).forEach((i) -> actual[i] = output.get(i));
                assertArrayEquals("Mismatch found in output", actual, expected);
                return null;
              });
      pipeline.run();
    }
  }
  