public static Properties requiredConsumerConfig() {
        final Properties consumerConfig = new Properties();
        consumerConfig.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9091");
        consumerConfig.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        consumerConfig.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
        return consumerConfig;
    }
Create a temporary relative directory in the specified parent directory with the given prefix.

@param parent The parent folder path name, if null using the default temporary-file directory
@param prefix The prefix of the temporary directory, if null using "kafka-" as default prefix
clients/src/test/java/org/apache/kafka/test/TestUtils.java