public static Builder defaultBuilder() {
        return new Builder()
                .setTypes(Stream.of(Type.ZK, Type.KRAFT, Type.CO_KRAFT).collect(Collectors.toSet()))
                .setBrokers(1)
                .setControllers(1)
                .setDisksPerBroker(1)
                .setAutoStart(true)
                .setSecurityProtocol(SecurityProtocol.PLAINTEXT)
                .setMetadataVersion(MetadataVersion.latestTesting());
    }
Represents an immutable requested configuration of a Kafka cluster for integration testing.
core/src/test/java/kafka/test/ClusterConfig.java