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   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
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   *
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   * Unless required by applicable law or agreed to in writing, software
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   * See the License for the specific language governing permissions and
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  package org.apache.beam.examples.complete.kafkatopubsub;
  
  import static org.hamcrest.Matchers.equalTo;
  import static org.hamcrest.Matchers.hasProperty;
  
  import com.google.auth.Credentials;
  import java.nio.charset.StandardCharsets;
  import java.util.UUID;
  import java.util.concurrent.ExecutionException;
  import org.apache.beam.examples.complete.kafkatopubsub.options.KafkaToPubsubOptions;
  import org.apache.beam.examples.complete.kafkatopubsub.transforms.FormatTransform.FORMAT;
  import org.apache.beam.runners.direct.DirectOptions;
  import org.apache.beam.sdk.PipelineResult;
  import org.apache.beam.sdk.extensions.gcp.auth.NoopCredentialFactory;
  import org.apache.beam.sdk.extensions.gcp.options.GcpOptions;
  import org.apache.beam.sdk.io.gcp.pubsub.PubsubOptions;
  import org.apache.beam.sdk.io.gcp.pubsub.TestPubsub;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.testing.TestPipeline;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  import org.apache.kafka.clients.consumer.ConsumerConfig;
  import org.apache.kafka.clients.producer.KafkaProducer;
  import org.apache.kafka.clients.producer.ProducerConfig;
  import org.apache.kafka.clients.producer.ProducerRecord;
  import org.apache.kafka.common.serialization.StringSerializer;
  import org.joda.time.Duration;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.ClassRule;
  import org.junit.Rule;
  import org.junit.Test;
  import org.testcontainers.containers.KafkaContainer;
  import org.testcontainers.containers.PubSubEmulatorContainer;
  import org.testcontainers.utility.DockerImageName;
  
  /** E2E test for {@link KafkaToPubsub} pipeline. */
  public class KafkaToPubsubE2ETest {
    private static final String PUBSUB_EMULATOR_IMAGE =
        "gcr.io/google.com/cloudsdktool/cloud-sdk:316.0.0-emulators";
    private static final String KAFKA_IMAGE_NAME = "confluentinc/cp-kafka:5.4.3";
    private static final String PUBSUB_MESSAGE = "test pubsub message";
    private static final String KAFKA_TOPIC_NAME = "messages-topic";
    private static final String PROJECT_ID = "try-kafka-pubsub";
    private static final PipelineOptions OPTIONS = TestPipeline.testingPipelineOptions();
  
    @ClassRule
    public static final PubSubEmulatorContainer PUB_SUB_EMULATOR_CONTAINER =
        new PubSubEmulatorContainer(DockerImageName.parse(PUBSUB_EMULATOR_IMAGE));
  
    @ClassRule
    public static final KafkaContainer KAFKA_CONTAINER =
        new KafkaContainer(DockerImageName.parse(KAFKA_IMAGE_NAME));
  
    @Rule public final transient TestPipeline pipeline = TestPipeline.fromOptions(OPTIONS);
    @Rule public final transient TestPubsub testPubsub = TestPubsub.fromOptions(OPTIONS);
  
    @BeforeClass
    public static void beforeClass() throws Exception {
      Credentials credentials = NoopCredentialFactory.fromOptions(OPTIONS).getCredential();
      OPTIONS.as(DirectOptions.class).setBlockOnRun(false);
      OPTIONS.as(GcpOptions.class).setGcpCredential(credentials);
      OPTIONS.as(GcpOptions.class).setProject(PROJECT_ID);
      OPTIONS
          .as(PubsubOptions.class)
          .setPubsubRootUrl("http://" + PUB_SUB_EMULATOR_CONTAINER.getEmulatorEndpoint());
      OPTIONS.as(KafkaToPubsubOptions.class).setOutputFormat(FORMAT.PUBSUB);
      OPTIONS
          .as(KafkaToPubsubOptions.class)
          .setBootstrapServers(KAFKA_CONTAINER.getBootstrapServers());
      OPTIONS.as(KafkaToPubsubOptions.class).setInputTopics(KAFKA_TOPIC_NAME);
      OPTIONS
          .as(KafkaToPubsubOptions.class)
          .setKafkaConsumerConfig(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG + "=earliest");
    }
  
    @Before
    public void setUp() {
      OPTIONS.as(KafkaToPubsubOptions.class).setOutputTopic(testPubsub.topicPath().getPath());
    }
  
    @Test
    public void testKafkaToPubsubE2E() throws Exception {
      PipelineResult job = KafkaToPubsub.run(pipeline, OPTIONS.as(KafkaToPubsubOptions.class));
  
      sendKafkaMessage();
      testPubsub
          .assertThatTopicEventuallyReceives(
              hasProperty("payload", equalTo(PUBSUB_MESSAGE.getBytes(StandardCharsets.UTF_8))))
          .waitForUpTo(Duration.standardMinutes(1));
      try {
        job.cancel();
      } catch (UnsupportedOperationException e) {
        throw new AssertionError("Could not stop pipeline.", e);
      }
    }
  
    private void sendKafkaMessage() {
      try (KafkaProducer<String, String> producer =
          new KafkaProducer<>(
              ImmutableMap.of(
                  ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,
                  KAFKA_CONTAINER.getBootstrapServers(),
                  ProducerConfig.CLIENT_ID_CONFIG,
                  UUID.randomUUID().toString()),
              new StringSerializer(),
              new StringSerializer())) {
        producer.send(new ProducerRecord<>(KAFKA_TOPIC_NAME, "testcontainers", PUBSUB_MESSAGE)).get();
      } catch (ExecutionException | InterruptedException e) {
        throw new RuntimeException("Something went wrong in kafka producer", e);
      }
    }
  }
  