public Future<KafkaVersionChange> reconcile()    {
        return getVersionFromController()
                .compose(i -> getPods())
                .compose(this::detectToAndFromVersions)
                .compose(i -> prepareVersionChange());
    }
@Test
    public void testDowngradeWithOlderSubversions(VertxTestContext context) {
        String oldKafkaVersion = KafkaVersionTestUtils.LATEST_KAFKA_VERSION;
        String oldInterBrokerProtocolVersion = "2.8";
        String oldLogMessageFormatVersion = "2.8";

        String kafkaVersion = KafkaVersionTestUtils.PREVIOUS_KAFKA_VERSION;
        String interBrokerProtocolVersion = "2.8";
        String logMessageFormatVersion = "2.8";

        VersionChangeCreator vcc = mockVersionChangeCreator(
                mockKafka(kafkaVersion, interBrokerProtocolVersion, logMessageFormatVersion),
                mockNewCluster(
                        null,
                        mockSps(oldKafkaVersion),
                        mockUniformPods(oldKafkaVersion, oldInterBrokerProtocolVersion, oldLogMessageFormatVersion)
                )
        );

        Checkpoint async = context.checkpoint();
        vcc.reconcile().onComplete(context.succeeding(c -> context.verify(() -> {
            assertThat(c.from(), is(VERSIONS.version(oldKafkaVersion)));
            assertThat(c.to(), is(VERSIONS.version(kafkaVersion)));
            assertThat(c.interBrokerProtocolVersion(), nullValue());
            assertThat(c.logMessageFormatVersion(), nullValue());

            async.flag();
        })));
    }