### Question:
KafkaAdminClient implements Closeable { public Properties getTopicConfig(String topic) { if (StringUtils.isBlank(topic)) throw new IllegalArgumentException("topic cannot be null, empty or blank"); LOG.debug("Fetching topic config for topic [{}]", topic); try { ConfigResource resource = new ConfigResource(ConfigResource.Type.TOPIC, topic); Map<ConfigResource, Config> configs = getNewAdminClient() .describeConfigs(Collections.singleton(resource)) .all() .get(operationTimeout, TimeUnit.MILLISECONDS); Config config = configs.get(resource); if (config == null) { throw new AdminOperationException("Unable to get topic config: " + topic); } Properties properties = new Properties(); config.entries().stream() .filter(configEntry -> configEntry.source() == ConfigEntry.ConfigSource.DYNAMIC_TOPIC_CONFIG) .forEach(configEntry -> properties.setProperty(configEntry.name(), configEntry.value())); return properties; } catch (InterruptedException | ExecutionException | TimeoutException e) { throw new AdminOperationException("Unable to retrieve configuration for topic: " + topic, e); } } KafkaAdminClient(Properties properties); Set<String> getTopics(); Set<TopicAndPartition> getPartitions(); Set<TopicAndPartition> getPartitions(String topic); Authorizer getAuthorizer(); Map<Resource, Set<Acl>> getAcls(); Map<Resource, Set<Acl>> getAcls(KafkaPrincipal principal); Set<Acl> getAcls(Resource resource); void addAcls(Set<Acl> acls, Resource resource); void removeAcls(Set<Acl> acls, Resource resource); void createTopic(String topic, int partitions, int replicationFactor); void createTopic(String topic, int partitions, int replicationFactor, Properties topicConfig); void deleteTopic(String topic); Properties getTopicConfig(String topic); void updateTopicConfig(String topic, Properties properties); int getTopicReplicationFactor(String topic); int getTopicPartitions(String topic); void addTopicPartitions(String topic, int partitions); AdminClient.ConsumerGroupSummary getConsumerGroupSummary(String consumerGroup); Collection<AdminClient.ConsumerSummary> getConsumerGroupSummaries(String consumerGroup); Map<TopicPartition, String> getConsumerGroupAssignments(String consumerGroup); @Override void close(); static final String ZOOKEEPER_SECURE; static final String DEFAULT_ZOOKEEPER_SECURE; static final String OPERATION_TIMEOUT_MS; static final String DEFAULT_OPERATION_TIMEOUT_MS; static final String OPERATION_SLEEP_MS; static final String DEFAULT_OPERATION_SLEEP_MS; }### Answer:
@Test public void getTopicConfig() { Properties topicConfig = new Properties(); topicConfig.setProperty(LogConfig.MinInSyncReplicasProp(), "1"); client.createTopic(topic, 1, 1, topicConfig); assertThat(client.getTopicConfig(topic), is(topicConfig)); }
@Test (expected = IllegalArgumentException.class) public void getTopicConfig_nullTopic() { client.getTopicConfig(null); }
@Test (expected = IllegalArgumentException.class) public void getTopicConfig_emptyTopic() { client.getTopicConfig(""); }