public Future<KafkaVersionChange> reconcile()    {
        return getPods()
                .compose(this::detectToAndFromVersions)
                .compose(i -> prepareVersionChange());
    }
@Test
    public void testDowngradeWithAllVersionAndMixedPods(VertxTestContext context) {
        VersionChangeCreator vcc = mockVersionChangeCreator(
                mockKafka(VERSIONS.version(KafkaVersionTestUtils.PREVIOUS_KAFKA_VERSION).version(), VERSIONS.version(KafkaVersionTestUtils.PREVIOUS_KAFKA_VERSION).metadataVersion(), VERSIONS.version(KafkaVersionTestUtils.PREVIOUS_KAFKA_VERSION).metadataVersion()),
                mockRos(mockMixedPods(VERSIONS.version(KafkaVersionTestUtils.PREVIOUS_KAFKA_VERSION).version(), VERSIONS.defaultVersion().version()))
        );

        Checkpoint async = context.checkpoint();
        vcc.reconcile().onComplete(context.succeeding(c -> context.verify(() -> {
            assertThat(c.from(), is(VERSIONS.defaultVersion()));
            assertThat(c.to(), is(VERSIONS.version(KafkaVersionTestUtils.PREVIOUS_KAFKA_VERSION)));
            assertThat(c.metadataVersion(), is(VERSIONS.version(KafkaVersionTestUtils.PREVIOUS_KAFKA_VERSION).metadataVersion()));

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