@Test
    void cluster_state_bundles_do_not_contain_distribution_config_if_feature_is_disabled() throws Exception {
        var f = new DistributionConfigInBundleFixture(false);
        var bundleCfg = ctrl.getClusterStateBundle().distributionConfig();
        assertFalse(bundleCfg.isPresent());
    }
Class for testing states of all nodes. Will fail in constructor with
debug message on non-expected results.
clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/StateChangeTest.java