### Question:
KafkaAdminClient extends AdminClient { static String prettyPrintException(Throwable throwable) { if (throwable == null) return "Null exception."; if (throwable.getMessage() != null) { return throwable.getClass().getSimpleName() + ": " + throwable.getMessage(); } return throwable.getClass().getSimpleName(); } private  KafkaAdminClient(AdminClientConfig config, String clientId, Time time, Metadata metadata,
                     Metrics metrics, KafkaClient client, TimeoutProcessorFactory timeoutProcessorFactory); @Override void close(long duration, TimeUnit unit); @Override CreateTopicsResult createTopics(final Collection<NewTopic> newTopics,
                                           final CreateTopicsOptions options); @Override DeleteTopicsResult deleteTopics(final Collection<String> topicNames,
                                           DeleteTopicsOptions options); @Override ListTopicsResult listTopics(final ListTopicsOptions options); @Override DescribeTopicsResult describeTopics(final Collection<String> topicNames, DescribeTopicsOptions options); @Override DescribeClusterResult describeCluster(DescribeClusterOptions options); @Override DescribeAclsResult describeAcls(final AclBindingFilter filter, DescribeAclsOptions options); @Override CreateAclsResult createAcls(Collection<AclBinding> acls, CreateAclsOptions options); @Override DeleteAclsResult deleteAcls(Collection<AclBindingFilter> filters, DeleteAclsOptions options); @Override DescribeConfigsResult describeConfigs(Collection<ConfigResource> configResources, final DescribeConfigsOptions options); @Override AlterConfigsResult alterConfigs(Map<ConfigResource, Config> configs, final AlterConfigsOptions options);  }### Answer:
@Test public void testPrettyPrintException() { assertEquals("Null exception.", KafkaAdminClient.prettyPrintException(null)); assertEquals("TimeoutException", KafkaAdminClient.prettyPrintException(new TimeoutException())); assertEquals("TimeoutException: The foobar timed out.", KafkaAdminClient.prettyPrintException(new TimeoutException("The foobar timed out."))); }