@Override
    public ConsumerBuilder<T> negativeAckRedeliveryBackoff(RedeliveryBackoff negativeAckRedeliveryBackoff) {
        checkArgument(negativeAckRedeliveryBackoff != null, "negativeAckRedeliveryBackoff must not be null.");
        conf.setNegativeAckRedeliveryBackoff(negativeAckRedeliveryBackoff);
        return this;
    }
@Test
    public void testNegativeAckRedeliveryBackoff() {
        consumerBuilderImpl.negativeAckRedeliveryBackoff(MultiplierRedeliveryBackoff.builder()
                .minDelayMs(1000)
                .maxDelayMs(10 * 1000)
                .build());
    }