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.kafka.connect.runtime.distributed;
  
  import org.apache.kafka.clients.CommonClientConfigs;
  import org.apache.kafka.common.config.ConfigException;
  import org.apache.kafka.common.security.auth.SecurityProtocol;
  
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.extension.ExtendWith;
  import org.mockito.junit.jupiter.MockitoExtension;
  import org.mockito.junit.jupiter.MockitoSettings;
  import org.mockito.quality.Strictness;
  
  import java.security.InvalidParameterException;
  import java.security.NoSuchAlgorithmException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Set;
  
  import javax.crypto.KeyGenerator;
  import javax.crypto.Mac;
  
  import static org.apache.kafka.connect.runtime.distributed.DistributedConfig.EXACTLY_ONCE_SOURCE_SUPPORT_CONFIG;
  import static org.apache.kafka.connect.runtime.distributed.DistributedConfig.GROUP_ID_CONFIG;
  import static org.apache.kafka.connect.runtime.distributed.DistributedConfig.INTER_WORKER_KEY_GENERATION_ALGORITHM_CONFIG;
  import static org.apache.kafka.connect.runtime.distributed.DistributedConfig.INTER_WORKER_SIGNATURE_ALGORITHM_CONFIG;
  import static org.apache.kafka.connect.runtime.distributed.DistributedConfig.INTER_WORKER_VERIFICATION_ALGORITHMS_CONFIG;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertNotEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  import static org.mockito.Mockito.doReturn;
  import static org.mockito.Mockito.doThrow;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  @ExtendWith(MockitoExtension.class)
  @MockitoSettings(strictness = Strictness.STRICT_STUBS)
  public class DistributedConfigTest {
  
      public Map<String, String> configs() {
          Map<String, String> result = new HashMap<>();
          result.put(DistributedConfig.GROUP_ID_CONFIG, "connect-cluster");
          result.put(DistributedConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
          result.put(DistributedConfig.CONFIG_TOPIC_CONFIG, "connect-configs");
          result.put(DistributedConfig.OFFSET_STORAGE_TOPIC_CONFIG, "connect-offsets");
          result.put(DistributedConfig.STATUS_STORAGE_TOPIC_CONFIG, "connect-status");
          result.put(DistributedConfig.KEY_CONVERTER_CLASS_CONFIG, "org.apache.kafka.connect.json.JsonConverter");
          result.put(DistributedConfig.VALUE_CONVERTER_CLASS_CONFIG, "org.apache.kafka.connect.json.JsonConverter");
          return result;
      }
  
      @Test
      public void shouldCreateKeyGeneratorWithDefaultSettings() {
          DistributedConfig config = new DistributedConfig(configs());
          assertNotNull(config.getInternalRequestKeyGenerator());
      }
  
      @Test
      public void testDefaultAlgorithmsNotPresent() throws NoSuchAlgorithmException {
          final String fakeKeyGenerationAlgorithm = "FakeKeyGenerationAlgorithm";
          final String fakeMacAlgorithm = "FakeMacAlgorithm";
  
          final KeyGenerator fakeKeyGenerator = mock(KeyGenerator.class);
          final Mac fakeMac = mock(Mac.class);
          final Crypto crypto = mock(Crypto.class);
  
          Map<String, String> configs = configs();
          configs.put(DistributedConfig.INTER_WORKER_KEY_GENERATION_ALGORITHM_CONFIG, fakeKeyGenerationAlgorithm);
          configs.put(DistributedConfig.INTER_WORKER_SIGNATURE_ALGORITHM_CONFIG, fakeMacAlgorithm);
          configs.put(DistributedConfig.INTER_WORKER_VERIFICATION_ALGORITHMS_CONFIG, fakeMacAlgorithm);
  
          // Make it seem like the default key generation algorithm isn't available on this worker
          doThrow(new NoSuchAlgorithmException())
                  .when(crypto).keyGenerator(DistributedConfig.INTER_WORKER_KEY_GENERATION_ALGORITHM_DEFAULT);
          // But the one specified in the worker config file is
          doReturn(fakeKeyGenerator)
                  .when(crypto).keyGenerator(fakeKeyGenerationAlgorithm);
  
          // And for the key verification algorithms
          for (String verificationAlgorithm : DistributedConfig.INTER_WORKER_VERIFICATION_ALGORITHMS_DEFAULT) {
              doThrow(new NoSuchAlgorithmException())
                      .when(crypto).mac(verificationAlgorithm);
          }
          doReturn(fakeMac).when(crypto).mac(fakeMacAlgorithm);
  
          // Should succeed; even though the defaults aren't present, the manually-specified algorithms are valid
          new DistributedConfig(crypto, configs);
  
          // Should fail; the default key generation algorithm isn't present, and no override is specified
          String removed = configs.remove(INTER_WORKER_KEY_GENERATION_ALGORITHM_CONFIG);
          assertThrows(ConfigException.class, () -> new DistributedConfig(configs));
          configs.put(INTER_WORKER_KEY_GENERATION_ALGORITHM_CONFIG, removed);
  
          // Should fail; the default key generation algorithm isn't present, and no override is specified
          removed = configs.remove(INTER_WORKER_SIGNATURE_ALGORITHM_CONFIG);
          assertThrows(ConfigException.class, () -> new DistributedConfig(configs));
          configs.put(INTER_WORKER_SIGNATURE_ALGORITHM_CONFIG, removed);
  
          // Should fail; the default key generation algorithm isn't present, and no override is specified
          removed = configs.remove(INTER_WORKER_VERIFICATION_ALGORITHMS_CONFIG);
          assertThrows(ConfigException.class, () -> new DistributedConfig(configs));
          configs.put(INTER_WORKER_VERIFICATION_ALGORITHMS_CONFIG, removed);
      }
  
      @Test
      public void testSupportedMacAlgorithms() {
          // These algorithms are required to be supported on JVMs ranging from at least Java 8 through Java 17; see
          // https://docs.oracle.com/javase/8/docs/api/javax/crypto/Mac.html
          // and https://docs.oracle.com/en/java/javase/17/docs/api/java.base/javax/crypto/Mac.html
          testSupportedAlgorithms(
                  "Mac",
                  "HmacSHA1", "HmacSHA256"
          );
      }
  
      @Test
      public void testSupportedKeyGeneratorAlgorithms() {
          // These algorithms are required to be supported on JVMs ranging from at least Java 8 through Java 17; see
          // https://docs.oracle.com/javase/8/docs/api/javax/crypto/KeyGenerator.html
          // and https://docs.oracle.com/en/java/javase/17/docs/api/java.base/javax/crypto/KeyGenerator.html
          testSupportedAlgorithms(
                  "KeyGenerator",
                  "AES", "DESede", "HmacSHA1", "HmacSHA256"
          );
      }
  
      private void testSupportedAlgorithms(String type, String... expectedAlgorithms) {
          Set<String> supportedAlgorithms = DistributedConfig.supportedAlgorithms(type);
          Set<String> unsupportedAlgorithms = new HashSet<>(Arrays.asList(expectedAlgorithms));
          unsupportedAlgorithms.removeAll(supportedAlgorithms);
          assertEquals(Collections.emptySet(), unsupportedAlgorithms, type + " algorithms were found that should be supported by this JVM but are not");
      }
  
      @Test
      public void shouldCreateKeyGeneratorWithSpecificSettings() {
          final String algorithm = "HmacSHA1";
          Map<String, String> configs = configs();
          configs.put(DistributedConfig.INTER_WORKER_KEY_GENERATION_ALGORITHM_CONFIG, algorithm);
          configs.put(DistributedConfig.INTER_WORKER_KEY_SIZE_CONFIG, "512");
          DistributedConfig config = new DistributedConfig(configs);
          KeyGenerator keyGenerator = config.getInternalRequestKeyGenerator();
          assertNotNull(keyGenerator);
          assertEquals(algorithm, keyGenerator.getAlgorithm());
          assertEquals(512 / 8, keyGenerator.generateKey().getEncoded().length);
      }
  
      @Test
      public void shouldFailWithEmptyListOfVerificationAlgorithms() {
          Map<String, String> configs = configs();
          configs.put(DistributedConfig.INTER_WORKER_VERIFICATION_ALGORITHMS_CONFIG, "");
          assertThrows(ConfigException.class, () -> new DistributedConfig(configs));
      }
  
      @Test
      public void shouldFailIfSignatureAlgorithmNotInVerificationAlgorithmsList() {
          Map<String, String> configs = configs();
          configs.put(DistributedConfig.INTER_WORKER_SIGNATURE_ALGORITHM_CONFIG, "HmacSHA1");
          configs.put(DistributedConfig.INTER_WORKER_VERIFICATION_ALGORITHMS_CONFIG, "HmacSHA256");
          assertThrows(ConfigException.class, () -> new DistributedConfig(configs));
      }
  
      @Test
      public void shouldNotFailIfKeyAlgorithmNotInVerificationAlgorithmsList() {
          Map<String, String> configs = configs();
          configs.put(DistributedConfig.INTER_WORKER_KEY_GENERATION_ALGORITHM_CONFIG, "HmacSHA1");
          configs.put(DistributedConfig.INTER_WORKER_SIGNATURE_ALGORITHM_CONFIG, "HmacSHA256");
          configs.put(DistributedConfig.INTER_WORKER_VERIFICATION_ALGORITHMS_CONFIG, "HmacSHA256");
          new DistributedConfig(configs);
      }
  
      @Test
      public void shouldFailWithInvalidKeyAlgorithm() {
          Map<String, String> configs = configs();
          configs.put(DistributedConfig.INTER_WORKER_KEY_GENERATION_ALGORITHM_CONFIG, "not-actually-a-key-algorithm");
          assertThrows(ConfigException.class, () -> new DistributedConfig(configs));
      }
  
      @Test
      public void shouldFailWithInvalidKeySize() throws NoSuchAlgorithmException {
          Map<String, String> configs = configs();
          Crypto crypto = mock(Crypto.class);
          KeyGenerator keygen = mock(KeyGenerator.class);
          when(crypto.keyGenerator(DistributedConfig.INTER_WORKER_KEY_GENERATION_ALGORITHM_DEFAULT)).thenReturn(keygen);
          // Some implementations of KeyGenerator don't fail with 0 keysize, so mock the error
          doThrow(InvalidParameterException.class).when(keygen).init(0);
          configs.put(DistributedConfig.INTER_WORKER_KEY_SIZE_CONFIG, "0");
          assertThrows(ConfigException.class, () -> new DistributedConfig(crypto, configs));
      }
  
      @Test
      public void shouldValidateAllVerificationAlgorithms() {
          List<String> algorithms =
              new ArrayList<>(Arrays.asList("HmacSHA1", "HmacSHA256", "HmacMD5", "bad-algorithm"));
          Map<String, String> configs = configs();
          for (int i = 0; i < algorithms.size(); i++) {
              configs.put(DistributedConfig.INTER_WORKER_VERIFICATION_ALGORITHMS_CONFIG, String.join(",", algorithms));
              assertThrows(ConfigException.class, () -> new DistributedConfig(configs));
              algorithms.add(algorithms.remove(0));
          }
      }
  
      @Test
      public void shouldAllowNegativeOneAndPositiveForPartitions() {
          Map<String, String> settings = configs();
          settings.put(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG, "-1");
          settings.put(DistributedConfig.STATUS_STORAGE_PARTITIONS_CONFIG, "-1");
          new DistributedConfig(configs());
          settings.remove(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG);
          settings.remove(DistributedConfig.STATUS_STORAGE_PARTITIONS_CONFIG);
  
          for (int i = 1; i != 100; ++i) {
              settings.put(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG, Integer.toString(i));
              new DistributedConfig(settings);
              settings.remove(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG);
  
              settings.put(DistributedConfig.STATUS_STORAGE_PARTITIONS_CONFIG, Integer.toString(i));
              new DistributedConfig(settings);
          }
      }
  
      @Test
      public void shouldNotAllowZeroPartitions() {
          Map<String, String> settings = configs();
          settings.put(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG, "0");
          assertThrows(ConfigException.class, () -> new DistributedConfig(settings));
          settings.remove(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG);
  
          settings.put(DistributedConfig.STATUS_STORAGE_PARTITIONS_CONFIG, "0");
          assertThrows(ConfigException.class, () -> new DistributedConfig(settings));
      }
  
      @Test
      public void shouldNotAllowNegativePartitionsLessThanNegativeOne() {
          Map<String, String> settings = configs();
          for (int i = -2; i > -100; --i) {
              settings.put(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG, Integer.toString(i));
              assertThrows(ConfigException.class, () -> new DistributedConfig(settings));
              settings.remove(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG);
  
              settings.put(DistributedConfig.STATUS_STORAGE_PARTITIONS_CONFIG, Integer.toString(i));
              assertThrows(ConfigException.class, () -> new DistributedConfig(settings));
          }
      }
  
      @Test
      public void shouldAllowNegativeOneAndPositiveForReplicationFactor() {
          Map<String, String> settings = configs();
          settings.put(DistributedConfig.CONFIG_STORAGE_REPLICATION_FACTOR_CONFIG, "-1");
          settings.put(DistributedConfig.OFFSET_STORAGE_REPLICATION_FACTOR_CONFIG, "-1");
          settings.put(DistributedConfig.STATUS_STORAGE_REPLICATION_FACTOR_CONFIG, "-1");
          new DistributedConfig(configs());
          settings.remove(DistributedConfig.CONFIG_STORAGE_REPLICATION_FACTOR_CONFIG);
          settings.remove(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG);
          settings.remove(DistributedConfig.STATUS_STORAGE_PARTITIONS_CONFIG);
  
          for (int i = 1; i != 100; ++i) {
              settings.put(DistributedConfig.CONFIG_STORAGE_REPLICATION_FACTOR_CONFIG, Integer.toString(i));
              new DistributedConfig(settings);
              settings.remove(DistributedConfig.CONFIG_STORAGE_REPLICATION_FACTOR_CONFIG);
  
              settings.put(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG, Integer.toString(i));
              new DistributedConfig(settings);
              settings.remove(DistributedConfig.OFFSET_STORAGE_PARTITIONS_CONFIG);
  
              settings.put(DistributedConfig.STATUS_STORAGE_PARTITIONS_CONFIG, Integer.toString(i));
              new DistributedConfig(settings);
          }
      }
  
      @Test
      public void shouldNotAllowZeroReplicationFactor() {
          Map<String, String> settings = configs();
          settings.put(DistributedConfig.CONFIG_STORAGE_REPLICATION_FACTOR_CONFIG, "0");
          assertThrows(ConfigException.class, () -> new DistributedConfig(settings));
          settings.remove(DistributedConfig.CONFIG_STORAGE_REPLICATION_FACTOR_CONFIG);
  
          settings.put(DistributedConfig.OFFSET_STORAGE_REPLICATION_FACTOR_CONFIG, "0");
          assertThrows(ConfigException.class, () -> new DistributedConfig(settings));
          settings.remove(DistributedConfig.OFFSET_STORAGE_REPLICATION_FACTOR_CONFIG);
  
          settings.put(DistributedConfig.STATUS_STORAGE_REPLICATION_FACTOR_CONFIG, "0");
          assertThrows(ConfigException.class, () -> new DistributedConfig(settings));
      }
  
      @Test
      public void shouldNotAllowNegativeReplicationFactorLessThanNegativeOne() {
          Map<String, String> settings = configs();
          for (int i = -2; i > -100; --i) {
              settings.put(DistributedConfig.CONFIG_STORAGE_REPLICATION_FACTOR_CONFIG, Integer.toString(i));
              assertThrows(ConfigException.class, () -> new DistributedConfig(settings));
              settings.remove(DistributedConfig.CONFIG_STORAGE_REPLICATION_FACTOR_CONFIG);
  
              settings.put(DistributedConfig.OFFSET_STORAGE_REPLICATION_FACTOR_CONFIG, Integer.toString(i));
              assertThrows(ConfigException.class, () -> new DistributedConfig(settings));
              settings.remove(DistributedConfig.OFFSET_STORAGE_REPLICATION_FACTOR_CONFIG);
  
              settings.put(DistributedConfig.STATUS_STORAGE_REPLICATION_FACTOR_CONFIG, Integer.toString(i));
              assertThrows(ConfigException.class, () -> new DistributedConfig(settings));
          }
      }
  
      @Test
      public void shouldAllowSettingConfigTopicSettings() {
          Map<String, String> topicSettings = new HashMap<>();
          topicSettings.put("foo", "foo value");
          topicSettings.put("bar", "bar value");
          topicSettings.put("baz.bim", "100");
          Map<String, String> settings = configs();
          topicSettings.forEach((k, v) -> settings.put(DistributedConfig.CONFIG_STORAGE_PREFIX + k, v));
          DistributedConfig config = new DistributedConfig(settings);
          assertEquals(topicSettings, config.configStorageTopicSettings());
      }
  
      @Test
      public void shouldAllowSettingOffsetTopicSettings() {
          Map<String, String> topicSettings = new HashMap<>();
          topicSettings.put("foo", "foo value");
          topicSettings.put("bar", "bar value");
          topicSettings.put("baz.bim", "100");
          Map<String, String> settings = configs();
          topicSettings.forEach((k, v) -> settings.put(DistributedConfig.OFFSET_STORAGE_PREFIX + k, v));
          DistributedConfig config = new DistributedConfig(settings);
          assertEquals(topicSettings, config.offsetStorageTopicSettings());
      }
  
      @Test
      public void shouldAllowSettingStatusTopicSettings() {
          Map<String, String> topicSettings = new HashMap<>();
          topicSettings.put("foo", "foo value");
          topicSettings.put("bar", "bar value");
          topicSettings.put("baz.bim", "100");
          Map<String, String> settings = configs();
          topicSettings.forEach((k, v) -> settings.put(DistributedConfig.STATUS_STORAGE_PREFIX + k, v));
          DistributedConfig config = new DistributedConfig(settings);
          assertEquals(topicSettings, config.statusStorageTopicSettings());
      }
  
      @Test
      public void shouldRemoveCompactionFromConfigTopicSettings() {
          Map<String, String> expectedTopicSettings = new HashMap<>();
          expectedTopicSettings.put("foo", "foo value");
          expectedTopicSettings.put("bar", "bar value");
          expectedTopicSettings.put("baz.bim", "100");
          Map<String, String> topicSettings = new HashMap<>(expectedTopicSettings);
          topicSettings.put("cleanup.policy", "something-else");
          topicSettings.put("partitions", "3");
  
          Map<String, String> settings = configs();
          topicSettings.forEach((k, v) -> settings.put(DistributedConfig.CONFIG_STORAGE_PREFIX + k, v));
          DistributedConfig config = new DistributedConfig(settings);
          Map<String, Object> actual = config.configStorageTopicSettings();
          assertEquals(expectedTopicSettings, actual);
          assertNotEquals(topicSettings, actual);
      }
  
      @Test
      public void shouldRemoveCompactionFromOffsetTopicSettings() {
          Map<String, String> expectedTopicSettings = new HashMap<>();
          expectedTopicSettings.put("foo", "foo value");
          expectedTopicSettings.put("bar", "bar value");
          expectedTopicSettings.put("baz.bim", "100");
          Map<String, String> topicSettings = new HashMap<>(expectedTopicSettings);
          topicSettings.put("cleanup.policy", "something-else");
  
          Map<String, String> settings = configs();
          topicSettings.forEach((k, v) -> settings.put(DistributedConfig.OFFSET_STORAGE_PREFIX + k, v));
          DistributedConfig config = new DistributedConfig(settings);
          Map<String, Object> actual = config.offsetStorageTopicSettings();
          assertEquals(expectedTopicSettings, actual);
          assertNotEquals(topicSettings, actual);
      }
  
      @Test
      public void shouldRemoveCompactionFromStatusTopicSettings() {
          Map<String, String> expectedTopicSettings = new HashMap<>();
          expectedTopicSettings.put("foo", "foo value");
          expectedTopicSettings.put("bar", "bar value");
          expectedTopicSettings.put("baz.bim", "100");
          Map<String, String> topicSettings = new HashMap<>(expectedTopicSettings);
          topicSettings.put("cleanup.policy", "something-else");
  
          Map<String, String> settings = configs();
          topicSettings.forEach((k, v) -> settings.put(DistributedConfig.STATUS_STORAGE_PREFIX + k, v));
          DistributedConfig config = new DistributedConfig(settings);
          Map<String, Object> actual = config.statusStorageTopicSettings();
          assertEquals(expectedTopicSettings, actual);
          assertNotEquals(topicSettings, actual);
      }
  
      @Test
      public void testInvalidSecurityProtocol() {
          Map<String, String> configs = configs();
  
          configs.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, "abc");
          ConfigException ce = assertThrows(ConfigException.class,
                  () -> new DistributedConfig(configs));
          assertTrue(ce.getMessage().contains(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG));
      }
  
      @Test
      public void testCaseInsensitiveSecurityProtocol() {
          final String saslSslLowerCase = SecurityProtocol.SASL_SSL.name.toLowerCase(Locale.ROOT);
          final Map<String, String> configs = configs();
          configs.put(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG, saslSslLowerCase);
          final DistributedConfig distributedConfig = new DistributedConfig(configs);
          assertEquals(saslSslLowerCase, distributedConfig.originalsStrings()
                  .get(CommonClientConfigs.SECURITY_PROTOCOL_CONFIG));
      }
  
      @Test
      public void shouldIdentifyNeedForTransactionalLeader() {
          Map<String, String> workerProps = configs();
  
          workerProps.put(EXACTLY_ONCE_SOURCE_SUPPORT_CONFIG, "disabled");
          assertFalse(new DistributedConfig(workerProps).transactionalLeaderEnabled());
  
          workerProps.put(EXACTLY_ONCE_SOURCE_SUPPORT_CONFIG, "preparing");
          assertTrue(new DistributedConfig(workerProps).transactionalLeaderEnabled());
  
          workerProps.put(EXACTLY_ONCE_SOURCE_SUPPORT_CONFIG, "enabled");
          assertTrue(new DistributedConfig(workerProps).transactionalLeaderEnabled());
      }
  
      @Test
      public void shouldConstructExpectedTransactionalId() {
          Map<String, String> workerProps = configs();
  
          workerProps.put(GROUP_ID_CONFIG, "why did i stay up all night writing unit tests");
          assertEquals(
                  "connect-cluster-why did i stay up all night writing unit tests",
                  new DistributedConfig(workerProps).transactionalProducerId()
          );
  
          workerProps.put(GROUP_ID_CONFIG, "connect-cluster");
          assertEquals(
                  "connect-cluster-connect-cluster",
                  new DistributedConfig(workerProps).transactionalProducerId()
          );
  
          workerProps.put(GROUP_ID_CONFIG, "\u2603");
          assertEquals(
                  "connect-cluster-\u2603",
                  new DistributedConfig(workerProps).transactionalProducerId()
          );
      }
  
      @Test
      public void testOsDefaultSocketBufferSizes() {
          Map<String, String> configs = configs();
          configs.put(CommonClientConfigs.SEND_BUFFER_CONFIG,
              Integer.toString(CommonClientConfigs.SEND_BUFFER_LOWER_BOUND));
          configs.put(CommonClientConfigs.RECEIVE_BUFFER_CONFIG,
              Integer.toString(CommonClientConfigs.RECEIVE_BUFFER_LOWER_BOUND));
          new DistributedConfig(configs);
      }
  
  }
  