protected int getDiffSize() {
        return brokerConfigDiff.size();
    }
@Test
    public void testChangedKRaftControllerConfigForCombinedNode() {
        NodeRef combinedNodeId = new NodeRef("broker-0", 0, "broker", true, true);
        List<ConfigEntry> desiredControllerConfig = singletonList(new ConfigEntry("controller.quorum.election.timeout.ms", "5000"));
        List<ConfigEntry> currentControllerConfig = singletonList(new ConfigEntry("controller.quorum.election.timeout.ms", "1000"));
        KafkaBrokerConfigurationDiff kcd = new KafkaBrokerConfigurationDiff(Reconciliation.DUMMY_RECONCILIATION, getCurrentConfiguration(currentControllerConfig),
                getDesiredConfiguration(desiredControllerConfig), kafkaVersion, combinedNodeId);
        assertThat(kcd.getDiffSize(), is(1));
    }